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中文摘要：
针对某600 MW超临界机组锅炉运行约40000 h后,高温再热器T23/TP347H异种钢管接头出现的开裂泄漏失效情况进行了理化分析。结果表明,异种钢管焊接接头的失效原因主要是由T23钢管焊接热影响区再热裂纹引起的,裂纹沿钢管周向分布,起裂于T23侧热影响区的粗晶区,沿晶界扩展,呈典型的脆性断裂特征。
英文摘要：
Physical and chemical analysis were carried out on the failed T23/TP347 H dissimilar steel welded tube joint for the high temperature reheater of a 600 MW supercritical boiler unit after running about 40000 hours. The results show that the leakage failure of the dissimilar steel welded tube joint is mainly caused by reheat cracking in the heat affected zone（ HAZ） near the side of T23 steel tube. The crack distributes along the circumferential direction of tube,which initiates in the coarse grain HAZ on the side of T23 steel tube,and expands along the grain boundary showing a typical brittle fracture.
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