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以超超临界汽轮机转子材料X12Cr Mo WVNbB10-1-1钢为对象,研究了在蠕变疲劳载荷下该材料的棘轮效应,探讨了在高温环境下不同峰值保持时间对棘轮效应的影响以及蠕变和棘轮之间的交互作用,并分析了棘轮效应的存在对寿命评估的影响.结果表明:保持时间会影响纯交变载荷下产生的非弹性应变循环累积εR1,在较低保持时间时,εR1不会出现安定现象,从而抑制了保持时间段内产生的蠕变应变循环累积εR2的演化;εR2对材料寿命的影响可以归类为与时间有关的蠕变损伤;提出采用εR1和循环塑性应变之和来度量棘轮应变εR1的损伤;针对不同的损伤机制,利用分区分析的方法可以进行精确的寿命评估.
Taking X12Cr Mo WVNbB10-1-1 as the rotor material of the supercritical turbine, the ratcheting effect of this material under creep fatigue load was studied. The effect of different peak hold time on the ratcheting effect and creep And ratchet wheel, and analyze the influence of ratcheting effect on life assessment.The results show that holding time affects the cumulative εR1 of inelastic strain cycle under purely alternating load, and εR1 The stability phenomenon will not occur, and the evolution of cumulative εR2 of creep strain during the holding time is restrained. The influence of εR2 on the material life can be classified as time-dependent creep damage. The εR1 and cyclic plastic strain And to measure the ratcheting strain εR1 damage; for different damage mechanisms, the use of partition analysis method can be accurate life assessment.