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镀锌层和焊接速度对镁/钢MIG焊接头微观组织的影响
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作者 冷宸 汪晓勇 +1 位作者 彭红兵 陈天威 《热加工工艺》 北大核心 2024年第19期44-49,共6页
以MIG电弧作为热源,分别对AZ31镁合金/Q235低碳钢与AZ31镁合金/DX51D镀锌钢进行连接。通过改变焊接速度,研究其对AZ31/Q235、AZ31/DX51D焊接接头焊缝成形、微观组织及硬度分布的影响,并揭示镀锌层的影响机理。结果表明:当焊接速度分别... 以MIG电弧作为热源,分别对AZ31镁合金/Q235低碳钢与AZ31镁合金/DX51D镀锌钢进行连接。通过改变焊接速度,研究其对AZ31/Q235、AZ31/DX51D焊接接头焊缝成形、微观组织及硬度分布的影响,并揭示镀锌层的影响机理。结果表明:当焊接速度分别为10、15 mm/s时,AZ31/Q235接头、AZ31/DX51D接头的焊缝成形较好。随着焊接速度的降低,AZ31/DX51D接头焊缝处析出更多的β-Al_(12)Mg_(17)相,界面层厚度增加。AZ31/DX51D接头界面结合较好,而AZ31/Q235接头界面出现未熔合、开裂等现象,这说明镀锌层有效促进了镁/钢界面的冶金结合。AZ31/DX51D接头界面处的硬度值最高达到250 HV,高于AZ31/Q235接头界面处硬度值。 展开更多
关键词 MIG熔-钎焊 镁/钢 焊接速度 硬度分布
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高强海工钢激光-MIG复合焊研究 被引量:1
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作者 陈天威 汪晓勇 +4 位作者 谢铿 白妮 彭红兵 冷宸 熊朝晖 《兵器材料科学与工程》 CAS CSCD 北大核心 2023年第4期125-133,共9页
高强海工钢具有强度高、质量轻等优点,在海洋工程、船舶制造等领域被广泛应用,然而高强海工钢焊接性较差、服役环境恶劣,传统的熔化焊方法很难实现高质量焊接。激光-MIG复合焊作为一种新型、高效、优质、节能的焊接方法,焊接高强海工钢... 高强海工钢具有强度高、质量轻等优点,在海洋工程、船舶制造等领域被广泛应用,然而高强海工钢焊接性较差、服役环境恶劣,传统的熔化焊方法很难实现高质量焊接。激光-MIG复合焊作为一种新型、高效、优质、节能的焊接方法,焊接高强海工钢具有独特优势。本文介绍了激光-MIG复合焊相较于其他焊接技术的优点,综述了激光-MIG复合焊过程中焊接参数对高强海工钢焊接接头显微组织和力学性能的影响,对高强海工钢激光-MIG复合焊的发展做了预测。 展开更多
关键词 激光-MIG复合焊 高强海工钢 焊接参数 显微组织 力学性能
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Textures of high-strength and low-expansion Fe-Ni alloy wires during cold-drawing processes 被引量:2
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作者 leng chen Jian-fu Zhang +1 位作者 Li Zhang Li Meng 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2009年第6期667-671,共5页
Textures of high-strength and low-expansion Fe-Ni alloy wires during cold-drawing processes were investigated using X-ray diffraction (XRD) and electron back scatter diffraction (EBSD) techniques. The experimental... Textures of high-strength and low-expansion Fe-Ni alloy wires during cold-drawing processes were investigated using X-ray diffraction (XRD) and electron back scatter diffraction (EBSD) techniques. The experimental results show that the 〈111〉 and 〈100〉 fibre textures are the main texture components, and crystalline grains in the surface are more fine and uniform than those in the center of Fe-Ni alloy wires during cold-drawing processes. It is found that the volume fraction of the 〈111〉 fibre texture component determined by quantitative regression calculation of the Gaussian distribution function reaches more than 60% and the strong 〈111〉 fibre texture component favors the torsional property of Fe-Ni alloy wires. 展开更多
关键词 Fe-Ni alloy COLD-DRAWING TEXTURE pole figure orientation mapping
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离子液体应用于丙酮-甲醇体系萃取精馏的技术研究 被引量:1
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作者 冷辰 辛华 +2 位作者 王鸿佳 曲颖 张志刚 《山东化工》 CAS 2022年第2期17-19,22,共4页
使用Aspen Plus过程模拟软件,模拟了离子液体1-烯丙基-3-甲基咪唑氯盐([AMIM]Cl)作为萃取剂,萃取精馏分离丙酮和甲醇共沸物的过程。分析了全塔理论板数、原料进料位置、回流比、塔顶产品产出量等因素对分离丙酮和甲醇共沸物分离效果的... 使用Aspen Plus过程模拟软件,模拟了离子液体1-烯丙基-3-甲基咪唑氯盐([AMIM]Cl)作为萃取剂,萃取精馏分离丙酮和甲醇共沸物的过程。分析了全塔理论板数、原料进料位置、回流比、塔顶产品产出量等因素对分离丙酮和甲醇共沸物分离效果的影响。获得的最佳工艺条件为:萃取精馏塔的全塔理论板为27块,原料进料位置为第11块理论板,萃取剂进料位置为第2块理论板,回流比为14,塔顶产品产出量为80 kmol/h。在此条件下,塔顶产品丙酮的质量分数为99.90%,回收的离子液体的质量分数为99.99%。说明以[AMIM]Cl为萃取剂萃取分离丙酮和甲醇共沸物具有很好的效果。 展开更多
关键词 丙酮 甲醇 离子液体 流程模拟 Aspen Plus
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离子液体萃取精馏分离丙酮-甲醇共沸体系过程模拟 被引量:1
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作者 辛华 冷辰 +2 位作者 王鸿佳 曲颖 张志刚 《山东化工》 CAS 2022年第1期210-212,220,共4页
使用Aspen Plus过程模拟软件,模拟了离子液体1-甲基-3-甲基咪唑磷酸二甲酯([MMIM][DMP])作为萃取剂,萃取精馏分离丙酮和甲醇共沸物的过程。分析了全塔理论板数、原料进料位置、回流比、塔顶产品产出量等因素对分离丙酮和甲醇共沸物分离... 使用Aspen Plus过程模拟软件,模拟了离子液体1-甲基-3-甲基咪唑磷酸二甲酯([MMIM][DMP])作为萃取剂,萃取精馏分离丙酮和甲醇共沸物的过程。分析了全塔理论板数、原料进料位置、回流比、塔顶产品产出量等因素对分离丙酮和甲醇共沸物分离效果的影响。获得的最佳工艺条件为:萃取精馏塔的全塔理论板为40块,原料进料位置为第24块理论版,萃取剂进料位置为第2块理论版,回流比为1.1,塔顶产品产出量为43 kmol/h。在此条件下,塔顶产品丙酮的质量分数为99.98%,回收的离子液体的质量分数为99.99%。说明以[MMIM][DMP]为萃取剂萃取分离丙酮和甲醇共沸物具有很好的效果。 展开更多
关键词 丙酮 甲醇 离子液体 流程模拟 Aspen Plus
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Relationship between texture and residual macro-strain in CVD diamond films based on phenomenological analysis
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作者 Weimin Mao Hongxi Zhu +1 位作者 leng chen Huiping Feng 《Journal of University of Science and Technology Beijing》 CSCD 2008年第2期197-201,共5页
The relationship between texture and elastic properties of chemical vapor deposition (CVD) diamond films was analyzed based on the phenomenological theory, which reveals the influence of crystalline orientation and ... The relationship between texture and elastic properties of chemical vapor deposition (CVD) diamond films was analyzed based on the phenomenological theory, which reveals the influence of crystalline orientation and texture on the residual macro-strain and macro-stress. The phenomenological calculations indicated that the difference in Young's modulus could be 15% in single diamond crystals and 5% in diamond films with homogeneously distributed strong fiber texture. The experimentally measured residual strains of free-standing CVD diamond films were in good agreement with the correspondingly calculated Young's modulus in connection with the multi-fiber textures in the films, though the difference in Young's modulus induced by texture was only around 1%. It is believed that texture should be one of the important factors influencing the residual stress and strain of CVD diamond films. 展开更多
关键词 diamond films elastic behavior TEXTURE residual stresses chemical vapor deposition (CVD)
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Strain-induced martensitic transformation in biomedical Co-Cr-W-Ni alloys 被引量:7
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作者 Zi-Yi Zhu Li Meng leng chen 《Rare Metals》 SCIE EI CAS CSCD 2020年第3期241-249,共9页
The nucleation,variant selection,and orientation dependence of the strain-induced martensitic transformation(SIMT)process in biomedical Co-Cr-W-Ni alloys were investigated.The experimental results show that theε-hexa... The nucleation,variant selection,and orientation dependence of the strain-induced martensitic transformation(SIMT)process in biomedical Co-Cr-W-Ni alloys were investigated.The experimental results show that theε-hexagonal-close-packed phase was preferentially formed at theΣ3 twin boundaries and high-angle grain boundaries during the tensile process.The theoretical analysis shows that the variant selection of SIMT is governed by Schmid’s law.However,the SIMTedε-phase did not form equally on the two sides of the annealing twins,even though they had the same Schmid factor.This phenomenon is related to the mechanical work developed by the formation of theε-phase.Only the side which has both high Schmid factor and high mechanical work can initiate the SIMT process.A strong<111>fiber texture was formed,and theε-variants tended to appear in grains with orientations close to the<111>and<100>directions during the tensile process.These results can provide theoretical guidance for controlling the SIMT process of Co-Cr-W-Ni alloys to fabricate more reliable stents. 展开更多
关键词 BIOMEDICAL Co-Cr-W-Ni alloys Straininduced martensitic transformation NUCLEATION VARIANT selection Orientation DEPENDENCE
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Solute Clusters/Enrichment at the Early Stage of Ageing in Mg-Zn-Gd Alloys Studied by Atom Probe Tomography 被引量:1
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作者 Xin-Fu Gu Tadashi Furuhara +1 位作者 leng chen Ping Yang 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2019年第2期187-193,共7页
Three-dimensional distribution of solute elements in an Mg–Zn–Gd alloy during ageing process is quantitatively characterized by three-dimensional atom probe(3DAP) tomography. Based on the radius distribution functio... Three-dimensional distribution of solute elements in an Mg–Zn–Gd alloy during ageing process is quantitatively characterized by three-dimensional atom probe(3DAP) tomography. Based on the radius distribution function, it is found that Zn–Gd solute pairs in Mg matrix appear mainly at two peaks at early stage of ageing, and the separation distance between Zn and Gd atoms could be well rationalized by the first-principle calculation. Moreover, the fraction of Zn–Gd solute pairs increases first and then decreases due to the precipitation of long-period stacking ordered(LPSO) structures. Both the composition of the structural unit in LPSO structure and the solute enrichment around it are quantified. It is found that Zn and Gd elements are synchronized in the LPSO structure, and solute segregation of pure Zn or Gd is not observed at the transformation front of the LPSO structure in this alloy. In addition, the crystallography of transformation front is further determined by 3DAP data. 展开更多
关键词 Magnesium alloy Long-period STACKING ordered(LPSO) Atomic cluster Three-dimensional atom probe(3DAP) CRYSTALLOGRAPHY
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Austenite transformation and work hardening of medium manganese steel 被引量:1
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作者 Lei Zhang Cun-yu Wang +4 位作者 Heng-chang Lu Wen-quan Cao Chang Wang Han Dong leng chen 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2018年第12期1265-1269,共5页
The austenite transformation behavior and mechanical properties of medium manganese steel subjected to tensile strain were studied by electron backscatter diffraction,X-ray diffraction and tensile tests.The results sh... The austenite transformation behavior and mechanical properties of medium manganese steel subjected to tensile strain were studied by electron backscatter diffraction,X-ray diffraction and tensile tests.The results show that the austenite phases are mainly distributed on the grain boundary in the duplex microstructure of austenite and ferrite,and it is easy for the big-size austenite to transform at small beginning tension strain following the mechanisms of both austenite (fcc)→ε- martensite (hcp)→α-martensite (bcc)and austenite (fcc)→α-martensite (bcc).Both yield strength and tensile strength increase with the increase in pre-strain,and the total elongation decreases,while the value of pre-strain plus total elongation almost keeps constant.During tensile deformation,transformation from austenite into martensite improves work-hardening rate remarkably. 展开更多
关键词 MEDIUM MANGANESE STEEL AUSTENITE MARTENSITE Microstructure Mechanical PROPERTY
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