High-temperature Tensile Behavior in Coarse-grained and Fine-grained Nb-containing 25Cr-20Ni Austenitic Stainless Steel

作     者：Guodong Hu Pei Wan Dianzhong Li Yiyi Li Guodong Hu;Pei Wang;Dianzhong Li;Yiyi Li

作者机构：Shenyang National Laboratory for Materials ScienceInstitute of Metal ResearchChinese Academy of Sciences72 Wenhua Road.Shenyang 110016China School of Materials Science and EngineeringUniversityof Science and Technology of China72 Wenhua RoadShenyang 110016China Centre of Excellence for Advanced MaterialsDongguan 523808China Songshan Lake Laboratory for Materials ScienceDongguan 523808China 

出 版 物：《Acta Metallurgica Sinica(English Letters)》 (金属学报（英文版）)

年 卷 期：2020年第33卷第11期

页      面：1455-1465页

核心收录：

学科分类：0817[工学-化学工程与技术] 0806[工学-冶金工程] 08[工学] 0807[工学-动力工程及工程热物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0802[工学-机械工程] 0703[理学-化学] 0811[工学-控制科学与工程] 

基　　金：financially supported by the Youth Innovation Promotion Association,Chinese Academy of Sciences(No.2013126) the Liao Ning Revitalization Talents Program under(No.XLYC1807022) the Guangdong Innovative and Entrepreneurial Research Team Program(No.2016ZT06G025) the Guangdong Basic and Applied Basic Research Foundation(No.2019A1515110886) 

主　　题：Austenitic stainless steels High-temperature tensile properties Grain size Precipitates 

摘      要：In this study,tensile behavior of Nb-containing 25Cr-20Ni austenitic stainless steels composed of coarse or fine grains has been investigated at temperatures ranging from room temperature to 900℃.Results show that the tensile strength of fine-grained specimens decreases faster than that of coarse-grained specimens,as the test temperature increases from 600℃ to 800℃.The rapidly decreasing tensile strength is attributed to the enhanced dynamic recovery and recrystallization,because additional slip systems are activated,and cross-slipping is accelerated during deformation in fine-grained *** tensile testing at 700-900℃,sigma phases are formed concurrently with dynamic recrystallization in fine-grained *** precipitation of sigma phases is induced by simultaneous recrystallization as the diffusion of alloying elements is accelerated during the recrystallization ***,the minimum ductility is observed in coarse-grained specimens at 800℃,which is caused by the formation of M23C6 precipitates at the grain boundaries.