摘要
研究采用电子背散射衍射技术(EBSD)对温轧及退火态Fe-13Cr-4.5Al-2.2Mo-1.1Nb(质量分数,%)钢的织构、晶界类型和Laves相进行了表征,并讨论了对力学性能的影响。结果表明,300℃温轧变形,70%的样品出现显著的变形不均匀组织,利用Taylor因子解释了不均匀变形特征,晶粒取向以变形织构α、γ和<100>//ND为主,比例分别为43.3%、39.0%和17.1%,屈服强度和抗拉强度为1 298.1 MPa和1 371.6 MPa,伸长率4%。750~800℃退火30~60 min后,再结晶晶粒尺寸小于10μm,γ织构比例减少至11.9%~15.5%,此时屈服强度为790~860 MPa,抗拉强度为840~890 MPa,伸长率为20%左右。1 000℃退火5 min后再结晶晶粒明显长大,γ织构增加至39.1%,此时屈服强度、抗拉强度和伸长率分别为567.7 MPa、800.7 MPa和25.6%。1 000℃时随退火时间增加,γ织构增加至50%以上,Laves相的钉扎是γ织构增加的原因。600℃温轧的微观组织和300℃温轧的类似,但屈服强度和抗拉强度略有下降,伸长率增加。
Texture, grain boundary and Laves phase of warm rolled and annealed Fe-13 Cr-4.5 Al-2.2 Mo-1.1 Nb were characterized by electron backscatter diffraction(EBSD), and their effects on the mechanical properties were discussed in details. The results show that, the 300 ℃ warm rolled sample with 70% reduction shows obvious in-homogenous deformed microstructure, which was explained by Taylor factor. The grain orientation of warm rolled sample is dominated by three texture of α, γ and <100>//ND, and the fraction are 43.3%, 39.0% and 17.1% respectively. The yield and tensile strength of warm rolled sample are 1 298.1 MPa and 1371.6 MPa, and the elongation is 4%. After annealing at 750-800 ℃ for 30-60 min, the recrystallized grain size of the samples is less than 10 μm, and the proportion of γ fiber decreased to 11.9%-15.5%, and the yield strength is 790-860 MPa, the tensile strength is 840-890 MPa, elongation is 20%. After annealing at 1 000 ℃ for 5 min, the recrystallized grain grow significantly, the proportion of γ fiber increased to 39.1%. The yield strength, tensile strength and elongation are 567.7 MPa, 800.7 MPa and 25.6%, respectively. With the increase of annealing time at 1 000 ℃, the proportion of γ fiber increases to more than 50%. The pinning effect of the Laves phase is the reason why the proportion of γ fiber increased. The microstructure features of 600 ℃ warm rolled sample are similar to that of 300 ℃ warm rolled one, the strength decreases and the elongation increases.
作者
梁小龙
潘钱付
王辉
郑继云
张瑞谦
刘会群
LIANG Xiao-long;PAN Qian-fu;WANG Hui;ZHENG Ji-yun;ZHANG Rui-qian;LIU Hui-qun(School of Materials Science and Engineering,Central South University,Changsha 410083,Hunan,China;Nuclear Power Institute of China,Chengdu 610213,Sichuan,China;Science and Technology on Reactor Fuel and Materials Laboratory,Chengdu 610213,Sichuan,China)
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2019年第11期1012-1022,共11页
Journal of Iron and Steel Research
基金
国家自然科学基金资助项目(U1867201)
