一种Fe-Ni-Co合金深冷轧制过程的显微组织及力学性能  

Microstructure and mechanical properties of Fe-Ni-Co alloy during cryorolling

作　　者：郑建军[1] 李长生[1] 贺帅[1] 马彪[1] 宋艳磊 

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819

出　　处：《辽宁科技大学学报》2017年第1期20-23,共4页Journal of University of Science and Technology Liaoning

基　　金：国家自然科学基金(51274062)

摘　　要：对Fe-Ni-Co(Fe-32.5%Ni-3.72%Co)合金进行了不同压下量的深冷轧制,利用光学显微镜、XRD等分析手段研究了合金的低温变形过程中的组织演变。研究结果表明,深冷处理后合金中形成了体积百分含量为20%左右的变温马氏体;随后的深冷轧制工艺触发了合金中形变诱导马氏体,并且马氏体转变量随着压下量的增加而增多。当累积压下量达到80%,合金中的马氏体含量达到了72.4%。由于低温变形使合金中形成了大量的马氏体,合金的显微硬度值迅速升高,80%累积压下量的深冷轧制后试样的显微硬度增加到375Hv。Fe-Ni-Co （Fe-32.5%Ni-3.72%Co） alloy was cryorolled under different rolling reductions in this pa- per. The microstructure evolution of the tested alloy during cryogenic temperature deformation was investigat- ed by optical microscope and XRD. The XRD results revealed that the volume fraction of athermal martensite was about 20% after cryogenic treatmen. Due to the deformation induced martensite during the subsequent cry- orolling, the amount of martensite transformation was gradually increased with the increase of rolling reduc- tion. At cryorolling reduction of 80%, the volume fraction ofmartensite transformed in the tested alloy was in- creased to 72.4%. Due to the large amount of martensite induced during cryorolling, the microhardness of the tested alloy was rapidly increased and reached to 375 HV after cryoroUing reduction of 80%.

关 键 词：Fe-32.5%Ni-3.72%Co合金 深冷轧制 显微组织 马氏体 显微硬度 

分 类 号：TG335.56[金属学及工艺—金属压力加工]