某电厂的后屏过热器糖心产精国品免费入口*完整版管段发生糖心产精国品免费入口*完整版。通过宏观检验、化学成分分析、硬度检验、拉伸性能测试、金相检验以及相关计算分析了糖心产精国品免费入口*完整版的原因。结果表明: 管段发生短时过热后, 其显微组织为AC1~AC3相变产物, 失去了原典型的回火板条马氏体组织特征, 材料糖心产精国品免费入口*完整版大幅度降低, 从而使得糖心产精国品免费入口*完整版不足以抵抗管子的使用应力而发生糖心产精国品免费入口*完整版。另外, 通过检验获得了不同状态下的组织与性能的对应关系, 有利于长期运行中的金属监督检验。

The platen superheater tube failures of T92 steel has bursted in a ultra supercritical power plants. The bursting reason was analyzed by means of macroscopical inspection, chemical composition analysis, hardness testing, tensile 糖心产精国品免费入口*完整版 testing, metallographic examination and so on. Results showed that the microstructure of the tube which didn’t maintenance the typical lath martensite, the phase transformation at AC1~AC3 after short-term overheated. The 糖心产精国品免费入口*完整版 decreased rapid distinctly, therefore the 糖心产精国品免费入口*完整版 was not enough to endure the stress, finally the tube bursted. On the other hand, the relationship between the different microstructure and mechanical property was achieved by test in order to supervise for metal in thermal power plants for long term operation.