摘要
针对20G锅炉膜式水冷壁防护要求,采用MIG焊技术在水冷壁表面堆焊Inconel 625合金,研究堆焊层组织、相组成、化学成分,测试堆焊水冷壁的力学性能。结果表明,堆焊层组织为奥氏体树枝晶;堆焊层与20G基体形成致密的冶金结合;Ni、Cr、Mo、Fe是组成是堆焊层的主要元素;堆焊层的硬度高于基体;堆焊了Inconel 625的锅炉水冷壁抗拉强度509 MPa,常温下冲击功45 J,Inconel 625强化了20G基体,并赋予基体更高的韧性。
The Inconel 625 alloy was surfaced on the water-walls tubes by MIG welding technique for the protection requirements of membrane water-walls of boiler. The microstructure,phase and chemical composition of the surfacing layer were analyzed. The results show that the microstructure of the surfacing layer is dendritic austenite and the essential elements of the surfacing layer are Ni,Cr,Mo and Fe. The test of the mechanical properties of the water-walls surfacing Inconel 625 alloy shows the interface of the surfacing layer and 20G matrix bonds well and the hardness of the surfacing layer is higher than that of the matrix. The tensile strength of water-walls of boiler with Inconel 625 alloy surfacing layer is up to 509 MPa,and its impact energy is 45 J,which indicates that the strength of the 20G matrix increases after surfacing Inconel 625,and its ductility is improved.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2013年第S2期96-99,共4页
Transactions of Materials and Heat Treatment
