摘要
采用光学显微镜、扫描电子显微镜和电子探针显微分析研究了热挤压镍基粉末冶金超级合金FGH96与304不锈钢(304SS)之间的界面,研究了304SS包覆层对挤压态FGH96合金表层组织的影响。结果表明,两合金间的界面结合良好,无缝隙或空洞。在FGH96合金表层生成一条尺寸约500 nm的Ti C颗粒相流线,Ti C颗粒相的形成与两种金属间Ti和C元素的扩散及反应密切相关。Ti元素的扩散导致FGH96合金表层组织中贫γ’相区域出现以及沿界面至FGH96合金方向上γ’相尺寸的梯度变化。另外,304SS包覆层对热挤压FGH96合金的影响较小,FGH96合金棒材距表层约20μm范围为组织异常区。
The hot-extruded interface between Ni-based powder metallurgy superalloy FGH96 and 304 stainless steel(304SS)was investigated by optical microscope,scanning electron microscope and electron probe micro analysis,and the effect of 304SS coating on the surface microstructure of hot-extruded FGH96 alloy was studied.The results show that the interface between the two alloys is well bonded,seamless or hollow.A TiC particle streamline with a size of about 500 nm is formed on the surface layer of FGH96 alloy.The formation of TiC particles is closely related to the diffusion and reaction of Ti and C elements between the two metals.The diffusion of Ti element leads to the generation of aγ'-poor region and the gradient variation of theγ'phase size from the interface to FGH96 alloy.In addition,the influence of 304SS coating on hot-extruded FGH96 alloy is small,and the abnormal microstructure area is just within a range of about 20μm from the interface.
作者
刘光旭
王晓峰
杨杰
邹金文
LIU Guangxu;WANG Xiaofeng;YANG Jie;ZOU Jinwen(Key Laboratory of Advanced High-temperature Structural Materials,AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China)
出处
《热加工工艺》
北大核心
2022年第5期37-40,共4页
Hot Working Technology
