Correlation Between Phase Stability and Tensile Properties of the Ni-Based Superalloy MAR-M247

作     者：Linxu Li Xiufang Gong Changshuai Wang Yunsheng Wu Hongyao Yu Haijun Su Lanzhang Zhou Linxu Li;Xiufang Gong;Changshuai Wang;Yunsheng Wu;Hongyao Yu;Haijun Su;Lanzhang Zhou

作者机构：State Key Laboratory of Long-Life High Temperature MaterialsDong Fang Turbine Co.LtdDeyang 618000China State Key Laboratory of Solidification ProcessingNorthwestern Polytechnical UniversityXi'an 710072China Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Beijing Key Laboratory of Advanced High Temperature MaterialsBeijing 100081China Beijing CISRI-GAONA Materials and Technology CO.LTDBeijing 100081China 

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

年 卷 期：2021年第34卷第6期

页      面：872-884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 National Natural Science Foundation of China (Nos. 51971216 and 51301171) the National Science and Technology Major Project of China (No. 2017-VI-0018-0090) the fund of State Key Laboratory of Long-life High Temperature Materials (No. DTCC28EE190231) the LiaoNing Revitalization Talents Program (No. XLYC1807038) 

主　　题：Ni-based superalloy Phase stability Tensile properties Fractural behavior 

摘      要：Phase stability and its effect on tensile properties of MAR-M247 alloy have been investigated during thermal exposure at 800–900°C for up to 10,000 *** investigations reveal that the larger secondaryγ′phase has no obvious growth,but the smaller tertiaryγ′phase obviously coarsens and the coalescence occurs during thermal exposure at 850°C and below.γ′coarsening behavior is consistent with the description of Ostwald ripening theory beforeγ′***-rich blocky MC carbide shows excellent thermal stability,but Ta-rich script-type MC carbide gradually degenerates via reaction,MC+γ→M_(23)C_(6)+γ′and finally formsγ film around MC and M_(23)C_(6) *** increasing thermal exposure time,the tensile strength *** ductility first increases and then decreases during exposure at 800°C,but it decreases continuously at 900°*** addition,the ductility keeps almost constant when the exposure time is longer than 5000 h.