The crack initiates at stress concentration point in the root of weld, where has much more martenite, carbide and inclusion, and the serious hydrogen segregation.
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释义
裂纹均在焊缝根部应力集中处萌生,该处马氏体含量比较大,碳化物及夹杂物较多,氢的偏聚现象严重。
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