摘要
使用自制Ni基微晶粉材 ,试验研究了 0Cr18Ni9Nb不锈钢液膜溶解扩散焊界面组织与性能。研究发现 ,应用具有亚稳态组织的Ni基微晶粉材可实现 0Cr18Ni9Nb不锈钢的溶解扩散连接。焊缝与母材结合良好。连接接头由焊缝区、结合界面和近界面母材区组成。其中 ,结合界面由厚度为 185 μm的单相γ(Ni)层和厚度为 75 μm的γ相及金属间化合物多相层两部分组成 ;焊缝区由均匀细小的γ(Ni)等轴晶和分布于其间的γ(Ni) +Fe4.5Ni8.5B6共晶体组成 ,γ(Ni)晶粒平均尺寸约 5 0 μm ;近界面母材中γ基体组织未发生明显的变化。接头抗拉强度达 2 80MPa ,连接接头硬度分布合理 ,焊缝与母材具有良好的匹配性。
Microstructures and properties of liquid film solute-diffusion bonding interface of OCrl8Ni9Nb stainless steel (SS) was studied. It shows that Ni-based alloy powders with metastable structure can realize the solute-diffusion bonding of OCrl8Ni9Nb stainless steels. The weld has good connection with base materials and the joint is composed of weld, bonding interface, and near interface base metal zone, of which, bonding interface zone is constructed by two parts: a single phase γ (Ni) layer of 185 μm thick and a poly-phase layer with γ phase and metallic compounds. The weld zone is composed of homogenous and fine equioxed γ(Ni) grains whose mean size is about 50 μm and intergranular (γ(Ni)+Fe4.5Ni8.5B6) eutectic. While the microstructure of γ-matrix in SS near interface shows no remarkable phase transformation. The joint has a tensile strengths up to 280 MPa and a reasonable distribution of hardness, therefore, good matching has been obtained between the weld and the stainless steel.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2004年第4期89-92,共4页
Transactions of The China Welding Institution
