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

查看全文 作　　者：Linxu [1,2]Li;Xiufang [1]Gong;Changshuai [3]Wang;Yunsheng [3]Wu;Hongyao [4,5]Yu;Haijun [2]Su;Lanzhang [3]Zhou 高影响力作者 机构地区：[1]State Key Laboratory of Long-Life High Temperature Materials,Dong Fang Turbine Co.,Ltd,Deyang 618000,China;[2]State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an 710072,China;[3]Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;[4]Beijing Key Laboratory of Advanced High Temperature Materials,Beijing 100081,China;[5]Beijing CISRI-GAONA Materials and Technology CO.,LTD,Beijing 100081,China高影响力机构 出　　处：《Acta Metallurgica Sinica(English Letters)》索引2021年第34卷第6期,共13页高影响力期刊 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)。 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 h.Detailed 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′coalescence.Hf-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) carbides.With increasing thermal exposure time,the tensile strength decreases.The ductility first increases and then decreases during exposure at 800°C,but it decreases continuously at 900°C.In addition,the ductility keeps almost constant when the exposure time is longer than 5000 h. 关 键 词：Ni-based superalloy Phase stability Tensile properties Fractural behavior
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