作　　者： ; ; (胡本芙）; (马文斌）;

机构地区： 北京科技大学材料科学与工程学院

出　　处： 《钢铁研究学报》 2011年第S2期514-517,共4页

摘　　要： 对新型涡轮盘用高性能粉末高温合金FGH4098Ⅰ进行过固溶热处理,借助场发射扫描电镜和透射电镜结合EBSD技术研究了不同冷却速度对其晶界形态的影响。结果表明,随着固溶冷却速度增加,晶界振幅A、晶界曲率GBCR和晶界表观宽度w呈指数衰减,晶界波长λ则呈线性增大。FGH4098Ⅰ合金中弯曲晶界由二次γ'相的突起生长和扇形结构发展所造成。 The effect of solution cooling rate on grain boundary morphology of a new type high-performance powder metallurgy(P/M) superalloy FGH4098Ⅰunder superslovus heat treatment was studied by means of field scanning electron microscope(FESEM) and transmission electron microscope(TEM) combining with Electron Backscattered Diffraction(EBSD). The results show that with increasing of solution cooling rate, the amplitude(A), grain boundary curvature ratio(GBCR) and apparent width(w) decay exponentially. While the wavelength(λ) of grain boundary increases linearly. In addition, the serrated grain boundaries are generated by the impingement of growing secondary γ′ precipitates and the development of fan type structures.

关 键 词： 镍基粉末高温合金 冷却速度 弯曲晶界 二次 相 扇形结构

领　　域： [金属学及工艺] [金属学及工艺] [金属学及工艺] [一般工业技术] [金属学及工艺]