采用慢应变速率试验(SSRT)研究了12C>F/M钢在25 MPa,550℃和650℃的超临界水(SCW)中的机械性能,以及在550℃的SCW中的应力腐蚀开裂(SCC)倾向.同时通过均匀腐蚀试验研究了12Cr-F/M钢在550℃/25MPa的SCW中的腐蚀性能.SSRT结果表明,12Cr-F/M钢在550℃/25 MPa时具有优良的机械性能,当温度升高到650 ℃时其机械强度下降明显,但延伸率基本不变.由断口SEM形貌可知,12Cr-F/M钢具有沿晶应力腐蚀开裂(IGSCC)倾向.均匀腐蚀结果表明,12CpF/M钢在550℃/25MPa的SCW中的腐蚀性能较差,其腐蚀增重呈现出抛物线生长规律,1 000 h后其腐蚀增重达741mg/dm2.同时发现其在600 h时表面氧化膜出现裂纹,1 000 h时后观察到氧化膜发生剥落,而氧化膜脱落主要是因为在降温过程中基体与氧化物间不一致的热膨胀系数造成的.
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