Effect of prior austenite grain size on isothermal bainite transformation in 65Cr steel

被引：8
作者：
Sun, Junjie [1 ]
Wang, Yingjun [1 ]
Guo, Shengwu [1 ]
Liu, Yongning [1 ]
机构：
[1] Xi An Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China
来源：
MATERIALS LETTERS | 2020年 / 266卷 / 266期
基金：
中国博士后科学基金; 中国国家自然科学基金;
关键词：
Steel; Ultrafine grain; Phase transformation; Microstructure; Upper bainite; Lower bainite; KINETICS;
D O I：
10.1016/j.matlet.2020.127495
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Isothermal bainite transformation was conducted on both ultrafine-grained (UFG) and normal-grained (NG) 65Cr steels. Both bainite morphology and transformation rate are greatly influenced by prior austenite grain size. Bainite transformation rate is greatly retarded in the UFG steel with average grain size of 4.6m. Lower bainite was obtained for both UFG and NG steels when austempered at 250LC and 300C; however, the bainite morphology changed from lower to upper banite for UFG steel when austempered at 400C, and lower bainite was still obtained in NG steel. This phenomenon is caused by austenite yield strength increase due to grain refinement. (C) 2020 Elsevier B.V. All rights reserved.
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页数：4
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