Effect of Pre-deformation on Nanoscale Precipitation and Hardness of a Maraging Stainless Steel  

作　　者：Xinlei Zhou Bin Wang Tianyi Zeng Wei Yan Junhua Luan Wei Wang Ke Yang Zengbao Jiao 

机构地区：[1]School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China [2]Shi-Changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China [3]School of Material Science and Engineering,Zhengzhou University,Zhengzhou 450001,China [4]Department of Materials Science and Engineering,City University of Hong Kong,Hong Kong,China [5]Department of Mechanical Engineering,The Hong Kong Polytechnic University,Hong Kong,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2022年第12期2089-2100,共12页金属学报（英文版）

基　　金：sponsored by the Youth Innovation Promotion Association of Chinese Academy of Sciences(No.2017233)。

摘　　要：The effect of pre-deformation on nanoscale precipitates and hardness of a maraging stainless steel strengthened by the coprecipitation of Ni_(3)Ti,Mo-enriched and Cr-enriched precipitates was systematically studied using electron back scattered diffraction,transmission electron microscopy and atom probe tomography(APT).Hardness measurements showed that the hardness of specimen with a deformation ratio of 90%peaked at HV 718 aged for 24 h,which is higher than that in the undeformed specimen(HV 603)aged for 72 h at 480℃.APT characterization revealed that pre-deformation could shorten the incubation time of the Mo-enriched and Cr-enriched precipitates.At the early-aged stage,pre-deformation increased the stain energy that inhibited the nucleation of Ni_(3)Ti precipitates,but accelerated the rejection of Mo from Ni-Ti clusters.Besides,the strengthening model indicated that strain hardening(43%)makes a larger contribution to the hardness at the early-aged condition,while precipitation hardening(58%)has most contribution to the hardness at the peak-aged conditition.

关 键 词：Maraging stainless steel PRE-DEFORMATION Precipitation hardening Atom probe tomography 

分 类 号：TG142.71[一般工业技术—材料科学与工程]