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fa men han jie re ying xiang qu can yu ao shi ti chan sheng yuan yin fen xi
Author(s): 
Pages: 51-53
Year: Issue:  10
Journal: Welding Technology

Keyword:  SA335 P91钢A217 C12A钢阀门裂纹残余奥氏体;
Abstract: 投产1个月左右某300 MW火力发电机组,其过热器出口与堵阀焊缝的热影响区出现了裂纹,引起蒸汽泄漏.对裂纹处进行金相分析,发现存在着大量残余奥氏体.大量残余奥氏体的存在减弱了该处的高温力学性能,成为产生裂纹的一个诱因.笔者对该处裂纹产生原因进行了分析,希望以后能避免此类情况的发生.
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