Effect of grit blasting and subsequent heat treatment on stress rupture property of a Ni-based single-crystal superalloy SGX3  

作　　者：Jinshan He Zhengrong Yu Longfei Li Xitao Wang Qiang Feng 

机构地区：[1]Beijing Advanced Innovation Center for Material Genome Engineering,Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Beijing 100083,China [2]Beijing Advanced Innovation Center for Material Genome Engineering,State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China [3]Shandong Provincial Key Laboratory for High Strength Lightweight Metallic Materials,Advanced Materials Institute,Qilu University of Technology(Shandong Academy of Sciences),Jinan 250353,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2020年第12期1681-1688,共8页金属学报（英文版）

基　　金：financially supported by the National Key Research and Development Program of China(Grant No.2016YFB0701403);the National Natural Science Foundation of China(Grant No.91860201)。

摘　　要：In the present study,the effect of grit blasting and subsequent heat treatment on the stress rupture properties of a thirdgeneration nickel-based single-crystal superalloy SGX3 sheet was studied.It was found that the stress rupture life of alloy SGX3 sheet at 980℃/250 MPa was reduced by about 60%by only vacuum heat treatment at 1100℃ for 200 h and further reduced by 20%and 70%respectively with grit blasting of 0.3 MPa/1 min and 0.5 MPa/2 min before heat treatment.The microstructure analysis results indicated that the degradation of stress rupture life of alloy SGX3 sheet by vacuum heat treatment was mainly attributed to the variation ofγ/γ′microstructure,i.e.,the decrease inγ′volume fraction and the coarsening ofγ′precipitates.Furthermore,such degradation by grit blasting and subsequent vacuum heat treatment should be attributed to the formation of cellular recrystallization with different thicknesses at the surface of alloy SGX3 sheet,which not only acts as the vulnerable site for cracks to initiate and propagate but also reduces the effective loading area.

关 键 词：Ni-based single-crystal superalloy Creep life Degradation RECRYSTALLIZATION 

分 类 号：TG156[金属学及工艺—热处理] TG132.3[金属学及工艺—金属学]