Effect of Long-Term Thermal Exposures on Tensile Behaviors of K416B Nickel-Based Superalloy  

作　　者：Mao-Kai Chen Jun Xie De-Long Shu Gui-Chen Hou Shu-Ling Xun Jin-Jiang Yu Li-Rong Liu Xiao-Feng Sun Yi-Zhou Zhou 

机构地区：[1]Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China [2]Shenyang University of Technology,Shenyang 110870,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2020年第12期1699-1708,共10页金属学报（英文版）

基　　金：financially supported by the National Basic Research Program of China(Nos.2010CB631200 and 2010CB631206);the National Natural Science Foundation of China(Nos.51701212,50931004,51571196,51601192 and 51671188);the State Key Laboratory of Solidification Processing in NWPU(SKLSP201747);the Liaoning Provincial Natural Science Foundation of China(No.2019-MS-336)。

摘　　要：The effect of long-term thermal exposure on the tensile behavior of a high W content nickel-based superalloy K416B was investigated.The microstructure and the deformation characteristics were observed by scanning electron microscopy and transmission electron microscopy,and the phase transformation of the alloy during long-term thermal exposure was analyzed by X-ray diffraction patterns and differential thermal analysis.Results showed that after thermal exposure at 1000℃,the MC carbides in the K416 B alloy decomposed into M_(6)C.During tensile deformation,dislocations slipping inγmatrix crossed over the M_(6)C by Orowan bowing mechanism.With the increase of thermal exposure time,the secondary M_(6)C reduced greatly the yield strength of the alloy at room temperature.Meanwhile,the continuous distribution of the secondary M_(6)C with great brittleness in the grain boundary could become the main source of crack,which might change the fracture characteristic of the alloy from trans-granular to intergranular.

关 键 词：K416B superalloy Thermal exposure Deformation mechanism Fracture characteristics 

分 类 号：TG132.3[一般工业技术—材料科学与工程]