利用透射电子显微镜(TEM)、能谱仪(EDX)和电子探针显微分析仪(EPMA)研究了珠光体钢/奥氏体钢(Cr5Mo/Cr21Ni12)异质焊头在高温时效和长期服役中元素C,Cr,Ni,Fe的扩散行为.结果表明:时效时奥氏体钢中Cr,Ni原子向熔合界面方向扩散,Fe原子向相反的方向扩散;增碳层中析出碳化物M23C6的成分与时效时间无关:增碳层最高含碳量由析出碳化物的类型、成分及紧靠熔合界面奥氏体钢中的Cr含量决定.并建立了碳的扩散模型.
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