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Tensile, creep behavior and microstructure evolution of an as-cast Ni-based K417G polycrystalline superalloy

查看全文 作　　者：Beining [1]Du;Ziyang [1,3]Hu;Liyuan [1]Sheng;Chuanyong [2]Cui;Jinxia [2]Yang;Yufeng [1]Zheng;Xiaofeng [2]Sun 高影响力作者 机构地区：[1]Shenzhen Institute, Peking University, 5henzhen 518057, China;[2]Institute of Metal Rearch.Chinese Academy of Sdences,Shenyang 110016,China;[3]Shenzhen Yezhan Electronics Co,, Ltd., Shenzhen 518110, China高影响力机构 出　　处：《Journal of Materials Science & Technology》索引2018年第34卷第10期,共12页高影响力期刊 基　　金：the Shenzhen Technology Innovation Plan(CXZZ20140731091722497 and CXZZ20140419114548507);the Shenzhen Basic Research Project(JCYJ20150529162228734,JCYJ20160407090231002,JCYJ20150625155931806 and JCYJ20160427100211076) 摘　　要：The Ni-based K417 G superalloy is extensively applied as aeroengine components for its low cost and good mid-temperature(600–900?C) properties. Since used in as-cast state, the comprehensive understanding on its mechanical properties and microstructure evolution is necessary. In the present research,the tensile, creep behavior and microstructure evolution of the as-cast K417 G superalloy under different conditions were investigated. The results exhibit that tensile cracks tend to initiate at MC carbide and γ/γ' eutectic structure and then propagate along grain boundary. As the temperature for tensile tests increases from 21?C to 700?C, the yield strength and ultimate tensile strength of K417 G superalloy decreases slightly, while the elongation to failure decreases greatly because of the intermediate temperature embrittlement. When the temperature rises to 900?C, the yield strength and ultimate tensile strength would decrease significantly. The creep deformation mechanism varies under different testing conditions. At 760?C/645 MPa, the creep cracks initiate at MC carbides and γ/γ' eutectic structures,and propagate transgranularly. While at 900?C/315 MPa and 950?C/235 MPa, the creep cracks initiate at grain boundary and propagate intergranularly. As the creep condition changes from 760?C/645 MPa to 900?C/315 MPa and 950?C/235 MPa, the ? phase starts to raft, which reduces the creep deformation resistance and increases the steady-state deformation rate. 关 键 词：微观结构 张力 进化 演员 行为 Ni 多晶 中间温度
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