采用80S-G低合金钢焊丝焊接C4镍基合金/X60低合金钢异种金属.利用扫描电镜观察C4镍基合金母材/80S-G焊缝之间熔合区微观组织,能谱分析该区元素分布.结果表明,C4镍基合金母材稀释进入80S-G低合金钢焊缝内,致使Ni、Cr、Mo元素质量分数从部分熔化区到过渡区缓慢降低,Fe元素质量分数增加.微观组织从单相奥氏体组织逐渐转化为奥氏体与铁素体组成的混合组织,在此区域中弥散分布少量析出相粒子.
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