首页> 外文会议>International Conference on Advances in Materials Technology for Fossil Power Plants >CREEP AND CREEP-FATIGUE CRACK GROWTH BEHAVIORS OF 30Cr1Mo1V ROTOR STEEL AFTER LONG TERM SERVICE
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CREEP AND CREEP-FATIGUE CRACK GROWTH BEHAVIORS OF 30Cr1Mo1V ROTOR STEEL AFTER LONG TERM SERVICE

机译:长期服务后30Cr1mo1v转子钢的蠕变和蠕变 - 疲劳裂纹增长行为

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This paper presents the creep and creep-fatigue crack growth behaviors of 30Cr1Mo1V turbine rotor steel which had been in service for 16 years. Two typical sections of the rotor, i.e. high and low temperature sections, are examined at 538°C, with crack initiation and propagation monitored by D.C. potential drop method in a compact tension (CT) specimen. The material of the high temperature section has the lower resistance to creep and creep-fatigue crack growths than the low temperature section. The creep crack initiation (CCI) time decreases with the increase of initial stress intensity factor. The creep-fatigue crack growth (CFCG) is dominated by the cycle-dependent fatigue process when the hold time at the maximum load is shorter, but it becomes dominated by the time-dependent creep process when the hold time becomes longer. The high temperature section shows a larger influence of time-dependent creep behavior on CFCG than the low temperature section.
机译:本文介绍了30Cr1mo1v汽轮机转子钢的蠕变和蠕变 - 疲劳裂纹增长行为,该钢铁钢16年。 转子的两个典型部分,即高温部分,在538℃下检查,具有D.C的裂纹启动和传播。潜在的液滴法在紧凑张力(CT)样本中。 高温截面的材料具有低于低温部分的蠕变和蠕变 - 疲劳裂纹生长的耐力较低。 随着初始应力强度因子的增加,蠕变裂纹启动(CCI)时间随着初始应力强度因子的增加而降低。 蠕变 - 疲劳裂纹生长(CFCG)在最大负载的保持时间较短时由周期依赖性疲劳过程主导,但是当保持时间变长时,它通过时间依赖性蠕变过程主导。 高温部分显示比低温部分对CFCG上的时间依赖性蠕变行为的影响更大。

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