采用摩擦焊接连接发动机涡轮增压器高温合金K418涡轮盘与调质钢42CrMo转子轴时,其接头常会发生低应力破坏和表面缺陷,拉伸断口外圈出现"光亮圆环".接头金相组织、断口微观形貌及接头元素成分分析表明,由于两种材料物理与化学性能的差异,焊接过程中发生了摩擦界面转移现象,新形成的"次生摩擦面"诱导碳元素在其上聚集,从而在高温合金一侧形成了一条沿着次生摩擦面分布的碳化物带,导致接头的低应力破坏.
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