提高马氏体时效不锈钢超低温韧性的热稳定化新工艺  

New Thermal Stabilization Technology for Improving the Cryogenic Toughness of Maraging Stainless Steel

作　　者：邱旭扬帆 杨卓越[1] 丁雅莉[1] QIU Xuyangfan;YANG Zhuoyue;DING Yali(Institute for Special Steel,Central Iron&Steel Research Institute,Beijing 100081,China)

机构地区：[1]钢铁研究总院特殊钢研究所,北京100081

出　　处：《新技术新工艺》2021年第2期11-14,共4页New Technology & New Process

摘　　要：研究了新的热稳定化处理工艺对马氏体时效不锈钢微观组织和超低温度韧性的影响,即在冷处理之前增加一道低于时效温度的热稳定化处理,除观察微观组织变化外,着重用X射线衍射方法检测不同温度热稳定化处理对最终的残留奥氏体量的影响,并对比观察了对力学性能的影响。研究结果表明,固溶处理后增加200~450℃热稳定化处理,明显抑制了随后-73℃冷处理过程中奥氏体进一步向马氏体转变,最终残留了更多的奥氏体。虽然480℃时效后的抗拉强度仅降低了7.0%~11.5%,但液氮温度U型缺口冲击功提高了2.7倍以上,其中400℃热稳定化处理作用更明显,相应的液氮温度U型缺口冲击功提高了3.7倍,表明增加热稳定化处理改善超低温度韧性十分显著。这种热稳定化处理工艺简单,可操作性较强,因而具有较大的应用前景。It was studied that the effect of a new thermal stabilization treatment process on microstructure and cryogenic toughness of maraging stainless steel,which was added before the cold treatment on the microstructure and cryogenic toughness of maraging stainless steel.In addition to observing the microstructure,the X-ray diffraction technology was mainly used to detect the effects of thermal stabilization treatment at different temperatures on the amount of retained austenite,and the effects on the mechanical properties were compared.The results showed that the heat stabilization treatment at temperature in a range from 200℃to 450℃after solution treatment obviously suppressed the further transformation of austenite to martensite during the subsequent cold treatment at-73℃,eventually,more austenite was retained.Although the tensile strength after aging at 480℃was only reduced by 7.0%-11.5%,the U-notch impact energy at liquid nitrogen temperature was increased by more than 2.7 times,among of that,the effect of thermal stabilization treatment at 400℃was obvious,and the corresponding liquid nitrogen temperature U-notch impact energy was increased by 3.7 times,which indicated that the thermal stabilization treatment technology significantly improved the cryogenic toughness.This thermal stabilization technology was simple and more operational,so it had a great application prospect.

关 键 词：马氏体时效不锈钢 热稳定化处理 残余奥氏体 微观组织 强度 超低温韧性 

分 类 号：TG142.7[金属学及工艺—金属材料]