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本文研究了T91钢高温时效过程中组织和力学性能演变规律;并通过高温持久强度试验,探讨不同组织样品的应力-时间关系,揭示显微组织与持久强度之间的关系,并给出剩余寿命分析公式。结果表明,T91钢在高温时效过程中板条马氏体退化为等轴铁素体,位错减少,M_(23)C_6、MX型碳化物开始析出长大。M_(23)C_6粗化以及板条马氏体结构退化是T91钢持久性能下降的主要因素。
In this paper, the evolution of microstructure and mechanical properties of T91 steel during aging at high temperature was studied. The stress-time relationship of different tissue samples was explored by high temperature long-term strength test to reveal the relationship between microstructure and long-lasting strength. The residual life Analysis formula. The results show that the martensite degenerates into equiaxed ferrite and the dislocation decreases during the aging of T91 steel. The M_ (23) C_6 and MX carbides begin to precipitate and grow up. The coarsening of M_ (23) C_6 and the degeneration of lath martensite structure are the main reasons for the deterioration of ductility of T91 steel.