Hot deformation behaviors and dynamic softening mechanisms of 7Mo super-austenitic stainless steel with high stacking fault energy

被引:22
|
作者
Xu, Shiguang [1 ]
He, Jinshan [1 ]
Zhang, Runze [1 ]
Zhang, Fucheng [3 ]
Wang, Xitao [1 ,2 ]
机构
[1] Univ Sci & Technol Beijing, Collaborat Innovat Ctr Steel Technol, Beijing 100083, Peoples R China
[2] Qilu Univ Technol, Adv Mat Inst, Shandong Acad Sci, Shandong Prov Key Lab High Strength Lightweight Me, Jinan 250353, Peoples R China
[3] Yanshan Univ, State Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Peoples R China
来源
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T | 2023年 / 23卷
基金
中国国家自然科学基金;
关键词
7Mo super-austenitic stainless steel; Hot deformation behaviors; Dynamic softening mechanism; Continuous dynamic recrystallization; Deformation microbands; MICROSTRUCTURAL EVOLUTION; RECRYSTALLIZATION BEHAVIOR; PROCESSING MAP; WORKING; MO; CR;
D O I
10.1016/j.jmrt.2023.01.108
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Hot deformation behaviors and dynamic softening mechanisms of the 7Mo super-austenitic stainless steel (SASS) were studied in the temperature range of 1000-1200 degrees C and stain rate of 0.001-10 s-1. It is found the optimum windows of hot deformation are mainly in the temperature range of 1030-1200 degrees C and strain rate range of 0.001-0.07 s-1, and temperature range of 1050-1200 degrees C and strain rate of 10 s-1. The apparent activation energy of 7Mo SASS has reached 558.9 kJ mol-1, which is about 100-180 kJ mol-1 larger than ordinary austenitic stainless steels and about 60-95 kJ mol-1 larger than 4.5-6 wt.% Mo super-austenitic stainless steels. Due to high stacking fault energy (SFE, 161.2 mJ m-2), planar gliding of dislocations is the main deformation mechanism of 7Mo SASS. As a result, dynamic recovery (DRV) and continuous dynamic recrystallization (CDRX) are easy to occur and play dominant roles in dynamic softening mechanism of this steel. In addition, at strain rate of 10 s-1, especially at low temperature, the appearance of microbands (MBs) significantly promotes CDRX. Large initial sigma precipitates and micron-sized dynamic sigma precipitates also promote CDRX through the particle-stimulated nucleation (PSN) mechanism.(c) 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
引用
收藏
页码:1738 / 1752
页数:15
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