摘要
对广泛使用于电厂主蒸汽管道的 12Cr1MoV耐热钢的蠕变曲线进行了研究 ,将恒应力蠕变与恒载荷蠕变进行对比 ,证明θProjectionConcept方法可以成功地描述恒应力蠕变 ,但不适合恒载荷蠕变。根据 12Cr1MoV钢的恒载荷蠕变曲线 ,提出一种描述恒应力和恒载荷蠕变曲线的修正的θ法 ,从而可利用已有的大量恒载荷蠕变数据 ,有效地进行蠕变曲线的外推。此外在蠕变曲线外推的基础上 ,结合损伤力学分析和归一化处理 ,提出了高温部件寿命逐步外推法的概念 ,从而摆脱了以往寿命外推方法存在的种种局限性 ,如工况的波动、组织的变化、材料自身的差异等带来的误差 。
This paper studied the creep curves of 12CrMoV heat resistant steel served as main steam pipes in power plant.By comparing constant-stress creep with constant-load creep,it was found that the method of θ Projection Concept could describe constant-stress creep successfully,but it was not applicable for the constant-load creep.Based on the constant-load creep curves of 12CrMoV steel,a modified θ method has been developed,which could describe both the constant-stress creep and constant-load creep successfully.Thereby,the extrapolations of creep curves can be made effectively with a lot of tested data of constant-load,Furthermore,on the basis of damage mechanics analysis and normalization treatment,a new concept of step-by-step extrapolation on the basis of extrapolation from creep curves was put forward to assess the residual life of high temperature components in power plants.The new step-by-step life extrapolation method gives a more accurate creep life estimation of certain components without considering uncertainties of classical extrapolation under conditions such as operation variations,microstructure alternation,and deference of test specimen from real components etc.creep
出处
《热力发电》
CAS
北大核心
2000年第6期32-35,共4页
Thermal Power Generation
