从再热裂纹的特征、形成机理和预防措施等方面综述了火力发电机组电站锅炉用耐热钢管焊接接头中再热裂纹的研究进展.目前关于再热裂纹的研究和应用还不十分深入,认识也不统一,对部分材料发生再热裂纹现象的解释还不充分,甚至存在相互矛盾之处.今后对电站锅炉用耐热钢管焊接接头再热裂纹的研究应集中在材料成分与性能的优化、沉淀析出、失效模型和高分辨率组织等方面,同时应建立再热裂纹评价系统以实现再热裂纹的预测与评价.
The research progress on reheat cracking of welded joint of heat-resistant steel pipe for thermal power plant boiler is summarized from the aspects such as reheat cracking characteristics,formation mechanism,and preventive measures.However,the research and application of reheat cracking is not very clear and unitary,and the explanation for the reheat cracking phenomenon of some materials is not enough,even contradictory.In the future,the research on reheat cracking of the welded joint of heat-resistant steel pipe for power plant boiler should be focused on the material composition and performance optimization,precipitation,failure model,high resolution microstructures,etc.Meanwhile,the reheat cracking evaluation system should be established to realize the prediction and evaluation of the reheat cracking.
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