在不同温度和压力条件下完成P92钢的蠕变及持久试验,采用SEM、TEM研究P92钢的强化机制及退化机制.持久试验外推强度同欧洲蠕变委员会公布的数据基本相同.Norton应力指数数值表明,高应力阶段的蠕变机制为位错蠕变.组织观察结果表明:P92钢的主要强化机制为位错强化及弥散强化,淬火得到的马氏体内部有高密度的位错,板条间的碳化物M23C6及弥散分布碳氮化物MX是P92钢热强性高的原因.随着位错密度的降低及析出相的粗化,P92钢的高温耐热性也降低.
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