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OALib Journal期刊
ISSN: 2333-9721
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超超临界发电厂中p92钢蠕变特性及断裂机制
DOI: 10.3969/j.issn.1671-7627.2014.03.007, PP. 32-38
Keywords: 超超临界发电,国产p92钢,蠕变,断裂,larson-miller
Abstract:
p92钢因其在高温条件下具有优异的抗氧化性能、高温蠕变性能以及较低的热膨胀系数,而被广泛应用于超超临界发电厂的主蒸汽管道等厚壁部件。通过625、650℃不同应力条件下的高温蠕变试验以及运用金相显微镜(om)、扫描电子显微镜(sem)等微观分析技术对国产p92钢的蠕变特性及断裂机制进行了分析,并与国外生产的p92钢进行比较。结果表明:国产p92钢最小蠕变速率和蠕变破断寿命与蠕变应力之间的关系均遵循幂定律;国产p92钢的蠕变寿命明显低于国外p92钢,蠕变过程中laves相的迅速长大和粗化是国产p92钢蠕变性能劣化的主要原因;larson-miller方法中,参数c=38时拟合的larson-miller曲线可以很好地与试验值吻合。
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