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INFLUENCE OF THE SECOND THERMAL CYCLE ON COARSE- GRAINED ZONE TOUGHNESS OF X70 STEEL 被引量:6
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作者 Y.Wang,T.Han and W.M.Zhao University of Petroleum,Dongying 257062,China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1999年第5期831-835,共5页
The influence of the second thermal cycle on coarse grained zone (CGHAZ) toughness of X70 steel is studied by weld thermal simulation test, scanning electron microscope and electron microprobe. The results show that ... The influence of the second thermal cycle on coarse grained zone (CGHAZ) toughness of X70 steel is studied by weld thermal simulation test, scanning electron microscope and electron microprobe. The results show that the CGHAZ toughness is improved after the second thermal cycle but being heated during the intercritical HAZ (ICHAZ). The CGHAZ toughness decreases evidently after being heated during partially transformed zone, which chiefly results from the carbon segregation to the grain boundaries of primal austenite, thus forming high carbon martensite austenite (M A) constituent and bringing serious intercritically reheated coarse grain HAZ (IRCGHAZ) embrittlement. 展开更多
关键词 weld thermal simulation pipeline steel heat affected zone impact toughness
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焊接热循环峰值温度对1000 MPa级超高强钢热影响区组织性能的影响
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作者 孙琦 李太江 +6 位作者 李巍 李生文 余阳 李聚涛 娄正计 许博炜 程晔锋 《热力发电》 CAS CSCD 北大核心 2024年第4期165-173,共9页
为研究1 000 MPa级超高强钢焊接热影响区(HAZ)不同区域的组织性能,采用焊接热模拟技术制备了试验钢在不同热循环峰值温度下的试样,通过夏比冲击试验研究了HAZ不同区域的冲击韧性。结果表明:在亚临界区(SCHAZ)、临界区(ICHAZ)和细晶区(FG... 为研究1 000 MPa级超高强钢焊接热影响区(HAZ)不同区域的组织性能,采用焊接热模拟技术制备了试验钢在不同热循环峰值温度下的试样,通过夏比冲击试验研究了HAZ不同区域的冲击韧性。结果表明:在亚临界区(SCHAZ)、临界区(ICHAZ)和细晶区(FGHAZ),样品冲击吸收能量、裂纹扩展能量和动态冲击韧度较大,断口上形成较大面积的脚跟形纤维区和剪切唇,微观可看到大小不一的韧窝,样品冲击韧性较好;在粗晶区(CGHAZ),样品各项冲击数据均急剧下降,断口呈宏观脆性断裂,几乎全为放射区,微观下显示准解理断裂特征,表明裂纹扩展时受到的阻力减小,裂纹萌生后稳定扩展的时间减少,失稳扩展较快,样品的冲击韧性恶化,CGHAZ为HAZ中的韧性谷区;组织分析表明,粗大的晶粒和粗大的马氏体板条是导致CGHAZ脆化的主要原因。该结论为探究1 000 MPa级超高强钢在水电工程中的优选研制及工程应用奠定了理论基础。 展开更多
关键词 超高强钢 焊接热模拟 焊接热影响区 冲击吸收能量 断裂韧度
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大热输入条件下氮含量对低碳Mo-V-Ti-B微合金钢粗晶热影响区组织与冲击韧性的影响
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作者 洪君 《河北冶金》 2024年第3期6-9,共4页
采用Gleeble研究了大热输入条件下,氮含量对低碳Mo-V-Ti-B微合金钢焊接粗晶热影响区组织和冲击韧性的影响。结果表明,在100 kJ/cm热输入条件下,85 N、110 N和144 N试验钢粗晶热影响区-20℃冲击功分别为186 J、97 J和57 J。随着试验钢中... 采用Gleeble研究了大热输入条件下,氮含量对低碳Mo-V-Ti-B微合金钢焊接粗晶热影响区组织和冲击韧性的影响。结果表明,在100 kJ/cm热输入条件下,85 N、110 N和144 N试验钢粗晶热影响区-20℃冲击功分别为186 J、97 J和57 J。随着试验钢中氮含量的增加,试验钢粗晶热影响区冲击功逐渐降低。当氮含量从85 ppm增加至110 ppm时,低碳Mo-V-Ti-B微合金钢焊接粗晶热影响区组织由块状铁素体+大量针状铁素体转变为块状铁素体+少量的针状铁素体,组织发生粗化,故粗晶热影响区冲击功降低。当氮含量从110 ppm进一步增加至144 ppm时,粗晶热影响区组织由块状铁素体+少量的针状铁素体转变为块状铁素体+珠光体,虽然块状铁素体晶粒发生细化,但是粗晶热影响区组织中的“硬相”珠光体的含量增加,并且珠光体尺寸较大,在冲击试样变形过程中“硬相”珠光体与基体形变不协调,从而导致裂纹的萌生,造成冲击功进一步下降。 展开更多
关键词 氮含量 大热输入 焊接 粗晶 热影响区 冲击韧性 珠光体
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Effect of Thermal Cycle on Microstructure and Fracture Morphology in HAZ of HQ130 Steel 被引量:4
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作者 Li Yajiang Zou Zengda +2 位作者 Cheng Zhunian Wei Xing Jiang Quanchang 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 1996年第2期38-43,共6页
The effect of different peak temperature(Tp) and cooling time (t8/5) on microstructure, hardness, impact toughness and fracture morphology in the heat-affected zone (HAZ) of HQ130 steel was studied by using weld therm... The effect of different peak temperature(Tp) and cooling time (t8/5) on microstructure, hardness, impact toughness and fracture morphology in the heat-affected zone (HAZ) of HQ130 steel was studied by using weld thermo-simulation test. Experimental results indicate that the impact toughness and hardness decrease with the decrease of Tpor increase of t8/5 under the condition of a single thermal cycle. There is a brittle zone in the vicinity of Tp= 800℃, where the impact toughness is considerably low. There is a softened zone in the vicinity of Tp=700℃, where the hardness decreases but the toughness increases. In the practical application of multi-layer and multipass welding, the welding heat input should be strictly limited (t8/5≤20s) so as to reduce the softness and brittleness in the HAZ of-HQ130 steel. 展开更多
关键词 high strength steel welding thermal cycle heat-affected zone MICROSTRUCTURE impact toughness
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Effect of t_(8/5) on the microstructure and properties of the HAZ of ASME SA213-T92 steel by thermal simulation 被引量:4
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作者 吴军 邹增大 王新洪 《China Welding》 EI CAS 2007年第3期36-40,共5页
The relationship between the t8/5 and micro-hardness, impact toughness in the heat affected zone (HAZ) of ASME SA213-792 at peak temperature of 1 350 ℃ was studied by thermal simulation. The result shows that the m... The relationship between the t8/5 and micro-hardness, impact toughness in the heat affected zone (HAZ) of ASME SA213-792 at peak temperature of 1 350 ℃ was studied by thermal simulation. The result shows that the micro-hardness of HAZ rises at the beginning and then decreases with increasing of t8/5 , whereas the impact toughness presents reverse trend. The distribution of precipitates in substrate has great influence on the impact toughness of HAZ. When the t8/5 is 40 s, chain-like precipitates lower the impact toughness of HAZ seriously. 展开更多
关键词 ASME SA213-T92 impact toughness micro-hardness heat-affected zone (HAZ) thermal simulation
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EFFECTS OF THERMAL CYCLE ON MECHANICAL PROPERTIES AND FRACTOGRAPHY IN HAZ OF HQ130 STEEL 被引量:1
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作者 B. Liu J.X.Qu W.J.Sun 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2004年第3期274-278,共5页
The effect of different peak temperature T_P) and cooling time (t_(8/5)) on hardness,impact toughness and fracture morphology in the heat--affected zone (HAZ) of HQ130steel was studied by using welding thermo--simulat... The effect of different peak temperature T_P) and cooling time (t_(8/5)) on hardness,impact toughness and fracture morphology in the heat--affected zone (HAZ) of HQ130steel was studied by using welding thermo--simulation test. Experimental results showthat the impact toughness and hardness decrease with the decrease of T_P or increase oft_(8/5) under the condition of a single thermal cycle. There is a brittle zone in the vicinityof T_P=800℃, where the impact toughness is considerebly low. There is softened zonein vicinity of T_P=700℃, Where the harkness decreases but the toughness increases. Inthe practical application of multi--layer and multi--pass welding, the welding heat inputshould be strictly limited (t_(8/5)≤20s) so as to reduce the softness and brittleness in theHAZ of HQ130 steel. 展开更多
关键词 high strength steel welding thermal cycle heat-affected zone impact toughness
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Microstructure and mechanical properties of heat-affected zone of 680 MPa grade steel endured thermal cycle of double-wire SAW
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作者 杨秀芝 余圣甫 +2 位作者 姚润钢 霍光瑞 周强 《China Welding》 EI CAS 2010年第1期65-69,共5页
Based on the measured thermal cycle of double-wire submerged arc welding (SAW), the gleeble thermal test was performed. Meanwhile, the Charpy V-notch impact test at -50 ℃ and hardness test at room temperature were ... Based on the measured thermal cycle of double-wire submerged arc welding (SAW), the gleeble thermal test was performed. Meanwhile, the Charpy V-notch impact test at -50 ℃ and hardness test at room temperature were carried out after the thermal test. Thermally cycled microstructure and fracture surfaces were observed too. The results indicate that impact toughness of heat-affected zone (HAZ) at -50 ℃ is lower than that of parent metal with different wire spacing and welding speed. The microstracture of coarse-grains heat-affected zone ( CGHAZ ) is mainly made up of lath bainite with serious brittleness. The study also shows that a smaller energy input could be adopted to ensure the toughness of welded joints at the welding process in a common molten pool, while a higher energy input could be exerted to enhance welding efficieney at the welding process in two separate molten pools. 展开更多
关键词 double-wire SAW thermal simulation impact toughness
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Thermal aging effect on 2205 duplex stainless steel
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作者 WANG Zhiyu CHEN Xu 《Baosteel Technical Research》 CAS 2017年第3期24-29,共6页
: The effect of isothermal aging treatment on the mechanical and corrosion properties of 2205 duplex stainless steel was investigated by means of impact toughness test and micro-hardness measurement in combination wi... : The effect of isothermal aging treatment on the mechanical and corrosion properties of 2205 duplex stainless steel was investigated by means of impact toughness test and micro-hardness measurement in combination with the critical pitting temperature (CPT) technique. The corresponding fractography of the steel was then observed after the impact toughness test. The results demonstrated that, at the critical temperature for precipitation of the sigma (σ) phase, e. g., 850 ℃, the impact toughness decreased rapidly and the micro-hardness increased gradually with increasing aging time. The CPT decreased from 61 to 15 ℃ as the aging time increased from 4 rain to 8 h. In addition, optical microscopy, transmission electron microscope (TEM) and X-ray diffraction studies showed that the ferrite in the steel transformed into secondary austenite and σ phase. 展开更多
关键词 duplex stainless steel thermal aging sigma phase impact toughness corrosion resistance
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X100管线钢焊接热影响区不同区域的显微组织与冲击韧性 被引量:2
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作者 李光 徐学利 +1 位作者 张骁勇 王洪铎 《机械工程材料》 CAS CSCD 北大核心 2023年第9期41-45,56,共6页
采用Gleeble-3500型热模拟试验机在不同峰值温度下对X100管线钢进行单道焊热模拟试验,研究了X100管线钢热影响区粗晶区(峰值温度1 300℃)、细晶区(峰值温度950℃)、临界区(峰值温度850℃)和亚临界区(峰值温度650℃)的组织和冲击韧性。... 采用Gleeble-3500型热模拟试验机在不同峰值温度下对X100管线钢进行单道焊热模拟试验,研究了X100管线钢热影响区粗晶区(峰值温度1 300℃)、细晶区(峰值温度950℃)、临界区(峰值温度850℃)和亚临界区(峰值温度650℃)的组织和冲击韧性。结果表明:粗晶区的奥氏体晶粒严重长大,晶界处存在块状马氏体-奥氏体(M-A)组元,与母材相比,其冲击吸收功下降了42.6%;细晶区的晶粒发生完全再结晶,晶粒尺寸均匀,晶粒中弥散分布着点状M-A组元,冲击吸收功损失不大;临界区的晶粒发生部分再结晶,晶粒大小不一,冲击吸收功下降了16.4%;亚临界区经历了一次短时高温回火,冲击韧性与母材相比变化不大。 展开更多
关键词 X100管线钢 热影响区 冲击韧性 显微组织 热模拟
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Effects of Al addition and cryogenic cyclic treatment on impact toughness of phase-transformable Ti-based bulk metallic glass composites 被引量:1
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作者 Tingyi Yan Long Zhang +6 位作者 R.Lakshmi Narayan Jingyu Pang Yi Wu Huameng Fu Hong Li Upadrasta Ramamurty Haifeng Zhang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2023年第9期210-220,共11页
Developing bulk metallic glass composites(BMGCs)with high toughness is vital for their practical application.However,the influence of different microstructures on the impact toughness of BMGCs is still unclear.The eff... Developing bulk metallic glass composites(BMGCs)with high toughness is vital for their practical application.However,the influence of different microstructures on the impact toughness of BMGCs is still unclear.The effects of Al addition and cryogenic cyclic treatment(CCT)on the Charpy impact toughness,a K,at 298 and 77 K of a series of phase-transformable BMGCs are investigated in this work.It is found that deformation-induced martensitic transformation(DIMT)of theβ-Ti dendrites is the dominant toughening mechanism in the phase-transformable BMGCs at 298 K,but at 77 K,the toughness of BMGCs is primarily determined by the intrinsic toughness of the glass matrix.The addition of Al can moderately tune theβ-Ti phase stability,which then affects the amount of DIMT and impact toughness of the BMGCs at 298 K.However,at 77 K,Al addition causes a monotonic decrease in the toughness of the BMGCs due to the embrittlement of the glass matrix.It is found that CCT can effectively rejuvenate the phase-transformable BMGCs,which results in an enhanced impact toughness at 298 K.However,the toughness at 77 K monotonously decreases with increasing the number of CCT cycles,suggesting that the rejuvenation of the glass matrix affects the toughness at both 298 and 77 K of BMGCs,but in dramatically different ways.These findings reveal the influence of microstructures and CCT on the impact toughness of BMGCs and provide insights that could be useful for designing tougher BMGs and BMGCs. 展开更多
关键词 Bulk metallic glass composites Charpy impact toughness Deformation-induced martensitic transformation METASTABILITY thermal cycling rejuvenation
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Microstructural evolution and its influence on the impact toughness of GH984G alloy during long-term thermal exposure 被引量:2
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作者 Yunsheng Wu Xuezhi Qin +1 位作者 Changshuai Wang Lanzhang Zhou 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2021年第1期61-69,共9页
The microstructure evolution and its effect on the impact toughness of a new Ni-Fe based alloy GH984 G,used in 700℃ ultra-super critical coal-fired power plant,were investigated during thermal exposure at 650℃-750℃... The microstructure evolution and its effect on the impact toughness of a new Ni-Fe based alloy GH984 G,used in 700℃ ultra-super critical coal-fired power plant,were investigated during thermal exposure at 650℃-750℃ for up to 10,000 h.The results show that the impact toughness at room tempe rature drops rapidly at the early stage during thermal exposure at 700℃ and then has no significant change even if after exposure for 10,000 h.The significant decline of the impact toughness is attributed to the coarsening of M_(23)C_(6) carbides at grain boundaries,which weakens the grain boundary strength and leads to the aging-induced grain boundary embrittlement.The M_(23)C_(6) carbides have almost no change with further thermal exposure and the impact toughness also remains stable.Additionally,the impact toughness rises with the increase of thermal exposure temperature.The size of γ' after thermal exposure at 750℃ for10,000 h is much bigger than that at 650℃ and 700℃ for 10,000 h.There fore,the intragranular strength decreases significantly due to the transformation of the interaction between γ' and dislocation from stro ngly coupled dislocation shearing to Orowan bowing.More plastic deformation occurs within grains after thermal exposure at 750℃ for 10,000 h,which increases the impact toughness. 展开更多
关键词 Ni-Fe based alloy GH984G Long-term thermal exposure Microstructure evolution impact toughness
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CF-8M铸造不锈钢主管道的热老化脆化行为研究
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作者 吕云鹤 肖青山 +2 位作者 马若群 陈银强 初起宝 《原子能科学技术》 EI CAS CSCD 北大核心 2023年第5期1016-1023,共8页
为了评价和预测铸造奥氏体不锈钢(CASS)材料服役期限内的热老化脆化程度,通过对美国的阿贡实验室(ANL)预测模型的研究和分析,以及在400℃下对核级CF-8M主管道材料实施了10 000 h的加速热老化试验,研究了CF-8M材料在不同热老化时间下拉... 为了评价和预测铸造奥氏体不锈钢(CASS)材料服役期限内的热老化脆化程度,通过对美国的阿贡实验室(ANL)预测模型的研究和分析,以及在400℃下对核级CF-8M主管道材料实施了10 000 h的加速热老化试验,研究了CF-8M材料在不同热老化时间下拉伸性能、冲击性能和微观组织的变化规律,以冲击能作为表征热老化脆化程度的参数,获得了CF-8M材料的热老化脆化预测关系式,并与ANL模型的预测结果进行了对比和分析。结果表明,在加速热老化试验周期内随着热老化时间的增加,CF-8M材料的室温和高温(350℃)0.2%塑性延伸强度变化缓慢,抗拉强度缓慢增加;室温冲击能迅速下降,8 000 h以后冲击能下降趋势接近饱和状态;ANL模型对试验对象在加速老化试验周期内的冲击能预测结果不保守。CF-8M材料加速热老化10 000 h即等效服役30.49 a,其热老化脆化程度接近于热老化饱和状态。 展开更多
关键词 CF-8M铸造不锈钢 热老化脆化 拉伸性能 冲击韧性 预测
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Evolution of γ’ Particles in Ni-Based Superalloy Weld Joint and Its Effect on Impact Toughness During Long-Term Thermal Exposure
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作者 Xian-Kai Fan Fu-Quan Li +3 位作者 Lei Liu Hai-Chao Cui Feng-Gui Lu Xin-Hua Tang 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2020年第4期561-572,共12页
Effects of long-term thermal exposure on γ’ particles evolution and impact toughness in the weld joint of Nimonic 263(N263)superalloy were deeply studied at 750℃.Results showed that the precipitates in the weld met... Effects of long-term thermal exposure on γ’ particles evolution and impact toughness in the weld joint of Nimonic 263(N263)superalloy were deeply studied at 750℃.Results showed that the precipitates in the weld metal were mainly composed of fine γ’ particles,bulky MC carbides,and small M23C6 carbides.With the thermal exposure time increasing from o to 3000 h,γ’ particles in the weld metal grew up from 19.7 nm to 90.1 nm at an extremely slow rate.After being exposed for 1000 h,γ’ particles coarsened and some of them transformed into acicular η phase.At the same time,MC carbides decomposed to form η phase and γ’ particles.This dynamic transition ensured the slight reduction in impact toughness of the weld metal after the thermal exposure,which indicated the stable serving performance of N263 weld joint. 展开更多
关键词 NI-BASED SUPERALLOY WELD joint LONG-TERM thermal exposure γ’Phase EVOLUTION impact toughness
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P91主蒸汽管道焊缝断裂韧度与其它力学性能的关系 被引量:27
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作者 李益民 史志刚 +1 位作者 贾建民 蔡连元 《中国电机工程学报》 EI CSCD 北大核心 2005年第3期153-157,共5页
文中对 P91 钢两类焊缝的拉伸、冲击、硬度,特别是断裂韧性进行了试验研究。结果表明:强度、硬度高,冲击韧性低的 R 焊缝具有低的断裂韧度,强度、硬度低,冲击韧性高的 D 焊缝具有高的断裂韧度;R 焊缝的低韧性主要与其晶粒粗大、网状晶... 文中对 P91 钢两类焊缝的拉伸、冲击、硬度,特别是断裂韧性进行了试验研究。结果表明:强度、硬度高,冲击韧性低的 R 焊缝具有低的断裂韧度,强度、硬度低,冲击韧性高的 D 焊缝具有高的断裂韧度;R 焊缝的低韧性主要与其晶粒粗大、网状晶界及焊接过程中焊接线能量和电流偏大有关,而 D 焊缝的低强度与高的断裂韧度则与焊后二次回火时温度过高有关。对于 R 焊缝,用厚度 12mm 的三点弯曲(SEB)试样测得的条件 KIC(Kq)与厚度 25mm 的紧凑拉伸(CT)试样测得的有效 KIC基本一致。 展开更多
关键词 焊缝 冲击韧性 断裂韧度 硬度 焊接过程 P91钢 晶界 强度 力学性能 拉伸
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焊接热循环对HQ130钢热影响区组织及性能的影响 被引量:16
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作者 李亚江 邹增大 +2 位作者 陈祝年 魏星 江全昌 《金属学报》 SCIE EI CAS CSCD 北大核心 1996年第5期532-537,共6页
采用模拟焊接热循环的方法,研究了不同峰值温度(Tm)和800℃冷却至500℃时间(t)对HQ130钢热影响区(HAZ)显微组织、硬度、冲击韧性和断口形态的影响。试验结果表明,单次热循环时随着HAZ中Tm的降低或t的增... 采用模拟焊接热循环的方法,研究了不同峰值温度(Tm)和800℃冷却至500℃时间(t)对HQ130钢热影响区(HAZ)显微组织、硬度、冲击韧性和断口形态的影响。试验结果表明,单次热循环时随着HAZ中Tm的降低或t的增加,冲击韧性和硬度相应地降低。在Tm=800℃附近的HAZ区域出现脆性区,韧性明显较低;Tm=700℃附近出现回火软化区,韧性较高,但硬度明显下降。在焊接生产中应采用多层多道焊并应严格限制焊接热量输入(t应以20s为下限),以防止或减弱HAZ软化和脆化现象。 展开更多
关键词 高强度钢 焊接热循环 热影响区 显微组织 冲击韧性
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焊接热循环对ASTM4130钢热影响区组织及韧性影响 被引量:13
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作者 李立英 王勇 +3 位作者 黎超文 韩涛 杨浩 薄国公 《材料热处理学报》 EI CAS CSCD 北大核心 2011年第1期56-60,共5页
采用金相、扫描电镜(SEM)和焊接热模拟方法,研究了不同峰值温度和焊接线能量对ASTM4130钢焊接热影响区(HAZ)显微组织、冲击韧性和断口形貌的影响。结果表明,ASTM4130钢热影响区除回火软化区外均发生脆化现象。当峰值温度为1200℃和1350... 采用金相、扫描电镜(SEM)和焊接热模拟方法,研究了不同峰值温度和焊接线能量对ASTM4130钢焊接热影响区(HAZ)显微组织、冲击韧性和断口形貌的影响。结果表明,ASTM4130钢热影响区除回火软化区外均发生脆化现象。当峰值温度为1200℃和1350℃时,由于晶粒粗大,且产生了贝氏体、未回火马氏体和M-A组元等非平衡组织,其冲击韧性损失达母材的94.5%,脆化现象最严重。当峰值温度为950℃,冲击韧性较低的原因是该区产生了未回火马氏体和块状铁素体。当峰值温度为800℃时,晶界附近碳化物聚集和不均匀分布,以及块状铁素体的存在,造成该区发生脆化。焊态下焊接线能量对ASTM4130钢粗晶区的冲击韧性影响较小。 展开更多
关键词 ASTM4130钢 焊接热模拟 热影响区 冲击韧性 断口形态
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2205双相不锈钢模拟焊接HAZ组织与性能 被引量:8
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作者 张建勋 李庆琰 +1 位作者 李为卫 张田宏 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2006年第11期1822-1825,共4页
采用热模拟法研究了2205DSS焊接HAZ的组织与性能,探讨了冷却时间对模拟HAZ冲击韧性的影响规律。结果表明:冷却时间对组织及性能有很大的影响,随冷却时间的延长,铁素体含量减少,奥氏体含量增加,冲击韧性增大;随冷却时间延长,模拟组织显... 采用热模拟法研究了2205DSS焊接HAZ的组织与性能,探讨了冷却时间对模拟HAZ冲击韧性的影响规律。结果表明:冷却时间对组织及性能有很大的影响,随冷却时间的延长,铁素体含量减少,奥氏体含量增加,冲击韧性增大;随冷却时间延长,模拟组织显微硬度降低,而且模拟组织中铁素体的硬度低于奥氏体的硬度;固定冷却时间t8/5时,随冷却时间t12/8的增加,冲击韧性提高;固定冷却时间t12/8时,随冷却时间t8/5的增加,冲击韧性降低。 展开更多
关键词 冷却时间 2205双相不锈钢 热模拟 冲击韧性
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X80管线钢焊接热影响区的韧性 被引量:15
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作者 熊庆人 高惠临 +2 位作者 霍春勇 冯耀荣 赵新伟 《机械工程材料》 CAS CSCD 北大核心 2007年第4期29-33,共5页
采用物理模拟技术以及显微分析方法对X80管线钢管焊接热影响区的组织性能变化规律进行了研究,分析了焊接热影响区性能恶化的原因,寻找了焊接接头韧性最薄弱的区域。结果表明:临界粗晶热影响区是X80管线钢管焊接热影响区韧性较差的脆化区... 采用物理模拟技术以及显微分析方法对X80管线钢管焊接热影响区的组织性能变化规律进行了研究,分析了焊接热影响区性能恶化的原因,寻找了焊接接头韧性最薄弱的区域。结果表明:临界粗晶热影响区是X80管线钢管焊接热影响区韧性较差的脆化区域;当焊接二次热循环峰值温度处于(α+γ)两相区时,形成的M-A组元的含量、尺寸、硬度较高,是引起X80管线钢局部脆化的主要组织因素。 展开更多
关键词 X80管线钢 冲击韧度 热模拟试验 临界粗晶热影响区
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硼掺入量对含硼金刚石单晶热稳定性的影响 被引量:5
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作者 王美 李和胜 +2 位作者 李木森 宫建红 田彬 《高压物理学报》 EI CAS CSCD 北大核心 2008年第2期215-219,共5页
在铁基触媒原材料中添加不同含量的六方氮化硼,采用粉末冶金方法制备片状触媒,在六面顶压机上合成出含硼金刚石单晶。用体视显微镜对金刚石单晶的结构、形貌进行观察,并用电子探针(EPMA)和波谱仪(WDS)分析了金刚石(111)晶面的硼含量,发... 在铁基触媒原材料中添加不同含量的六方氮化硼,采用粉末冶金方法制备片状触媒,在六面顶压机上合成出含硼金刚石单晶。用体视显微镜对金刚石单晶的结构、形貌进行观察,并用电子探针(EPMA)和波谱仪(WDS)分析了金刚石(111)晶面的硼含量,发现金刚石表面有硼元素存在,且其含量随着触媒中掺硼量的增加而变化。在测定了含硼金刚石单晶的静压强度的基础上,采用冲击韧性测定仪和差热分析仪对不同掺硼量触媒合成出的金刚石单晶在空气中的热稳定性进行了系统的对比研究。结果表明,触媒掺硼量对金刚石的机械强度和热稳定性有重要影响,随着掺硼量的变化,其机械强度和热稳定性均存在一个最佳值。 展开更多
关键词 掺硼量 含硼金刚石 热冲击韧性 静压强度 热稳定性
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超低碳9Ni钢焊接接头低温韧性 被引量:10
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作者 王国平 陈学东 王冰 《焊接学报》 EI CAS CSCD 北大核心 2008年第3期37-40,共4页
针对新研制的通过淬火、中间淬火和回火处理工艺获得的超低碳9Ni钢,对其进行了实际焊接接头和模拟焊接热影响区低温韧性的研究。经-196℃低温夏比V形缺口冲击试验、金相显微观察、透射和扫描电镜分析。结果表明,单道焊粗晶区组织为粗大... 针对新研制的通过淬火、中间淬火和回火处理工艺获得的超低碳9Ni钢,对其进行了实际焊接接头和模拟焊接热影响区低温韧性的研究。经-196℃低温夏比V形缺口冲击试验、金相显微观察、透射和扫描电镜分析。结果表明,单道焊粗晶区组织为粗大的板条状马氏体,低温冲击韧性较低。多道焊热影响区组织中,在马氏体板条间析出了逆转奥氏体,这种呈弥散分布的逆转奥氏体能细化晶粒、提高焊接热影响区的低温韧性。认为采用小热输入、多层焊、低的层间温度,可使焊接接头获得高的低温冲击韧性。 展开更多
关键词 9NI钢 热模拟 焊接接头 低温冲击韧性
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