采用热模拟法进行600～1300℃温度区间P92钢的高温拉伸实验.利用SEM,LSCM对不同拉伸温度下的断口形貌及近断口组织进行分析,并对P92钢的力学性能进行研究.结果表明:P92钢拉伸时,抗拉强度由467.32MPa下降到24.32MPa,屈服强度由56.88MPa下降到1.07MPa;不同拉伸温度下,断口表现以韧性断裂为主,韧性与脆性特征共存的现象.在600～900℃时,P92钢发生了动态回复过程,断口形貌表现为韧窝特征.冷却至室温,P92钢近断口处组织均为马氏体+残余奥氏体组织+M7C3 +MC+M23C6 +M6C+M3C型碳化物.随着温度升高,P92钢发生了动态再结晶,断口形貌以塑孔为主.P92钢近断口处组织为马氏体+残余奥氏体组织+MC+M6C型碳化物.
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