摘要
对L415/316L复合管进行了充氩和免充氩焊接,采用光学显微镜、电子探针对焊缝组织及主要合金元素分布进行了分析,并采用硬度计测定了接头硬度分布。结果表明,是否采用氩气保护对L415/316L复合管焊接接头组织、化学成分及硬度没有影响。不锈钢层组织为奥氏体和少量铁素体,过渡层为板条状马氏体和类固溶体奥氏体。过渡层焊缝硬度明显高于碳钢层和不锈钢层。背部采用保护剂焊接可以代替传统的充氩焊接,以提高焊接效率。
L415/316L bimetal lined pipes were welded under free- and argon atmosphere. M icrostructure and the distribution of the main alloying elements of the welded joints were analyzed by optical microscope （OM） and electron probe microscope analysis （EPMA） , the hardness was measured by sclerometer. The results show that the microstructure, chemical composition and hardness distribution are not affected by the size of bimetal lined pipe and gasous atmosphere, namely free and argon welding. Microstructure of stainless layer of the welded joint is austenite and a small amount of ferrite, and transition layer of the welded joint consists of both lath martensite and austenite similar to solid solution. The transition layer, hardness is much higher than that of carbon steel layer and stainless layer. The welding efficiency of free-argon welding is more than traditional welding under Ar atmosphere.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2014年第1期125-130,共6页
Transactions of Materials and Heat Treatment
基金
山东省自然科学基金(ZR2013EEQ027)
中央高校基本科研业务费专项资金资助(14CX02066A)
