20钢/GH4169固相扩散焊界面元素迁移研究  

Study on Interface Element Migration of 20 Steel/GH4169 Solid Phase Diffusion Welding

作　　者：黄本生[1] 杨承翰 任俊 李天宁 李光文 文雄 HUANG Bensheng;YANG Chenghan;REN Jun;LI Tianning;LI Guangwen;WEN Xiong(School of Materials Science and Engineering,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]西南石油大学材料科学与工程学院,四川成都610500

出　　处：《热加工工艺》2021年第13期63-67,共5页Hot Working Technology

摘　　要：20钢/GH4169扩散连接应用非常广泛。采用金相显微镜观察焊接接头组织结构。通过SEM观察焊缝微观组织形貌。采用EDS研究分析不同温度下不同位置的元素扩散规律,并通过XRD分析扩散溶解层区的产物。结果表明:压力1 MPa,真空度为1×10^(-2)Pa,保温温度1000℃和1050℃下,20钢与镍基合金GH4169达到了良好的冶金结合。随温度提高,20钢的针状铁素体转变为粗大的等轴晶,镍基侧沿基体外缘晶界形成奥氏体晶粒并长大,镍基合金沿界面处析出棒状和球状第二相颗粒,20钢与GH4169连接界面有明显的Cr、Ni、Fe元素扩散现象。本实验条件下,20钢和GH4169的界面处发生Si原子偏聚,并发生扩散反应沿20钢基体生成FeSi2金属间化合物层。The 20 steel/GH4169 diffusion connection is widely used. The microstructure of welded joint was observed by metallographic microscope. The microstructure of the weld was observed by SEM. EDS was used to study the diffusion of elements at different temperatures and positions. XRD was used to analyze the products of diffuse dissolved zone. The results show that when the pressure is 1 MPa, the vacuum degree is 1 ×10^(-2) Pa, the holding temperature is 1000℃ and 1050℃, 20 steel and GH4169 alloy achieve good metallurgical combination. With the increase of temperature, the acicular ferrite of 20 steel turns into thick equiaxed grains. Austenite grains form and grow along the grain boundary of outer edge of matrix on GH4169 side. The rods and spheres second phase particles precipitate along the interface of GH4169. The interface between 20 steel and GH4169 shows obvious diffusion of Cr, Ni and Fe. In this experiment, Si atoms partially segregates at the interface of 20 steel and GH4169, and diffusion reaction occurs to generate FeSi2 intermetallic compound layer along the substrate of 20 steel.

关 键 词：20钢/GH4169 元素扩散 扩散溶解层 

分 类 号：TG457.11[金属学及工艺—焊接]