超期服役的X20耐热钢主蒸汽管道疲劳性能研究  

Fatigue Properties of Overrunning X20 Main Steam Pipe

作　　者：王岗[1] 胡正飞[1] 

机构地区：[1]同济大学材料科学与工程系,上海201804

出　　处：《金属功能材料》2013年第1期23-26,共4页Metallic Functional Materials

基　　金：国家自然科学基金项目(50871076)

摘　　要：本文的研究对象为在热电厂主蒸汽管道服役长达230,000h的X20马氏体耐热钢,对其和原始材料分别选取5个应力幅进行单轴常温疲劳试验,划分了高周疲劳区、低周疲劳区以及过渡区。通过对比试验了解了X20钢的疲劳特性,推算出两种试样的Basquin公式,用于预测X20耐热钢的疲劳寿命,并利用应力-应变曲线进行了循环应变分析。The uniaxial fatigue life of X20 martensitic main steam pipe after 230,000 hour service and the virginal samples under different stress amplitudes were tested in this paper.It was divided into the high cycle fatigue area,low cycle fatigue area and the transition area for samples of 230,000 h and the virginal samples.Fatigue characteristics are studied through the comparison experiments and Basquins equations are derived from experimental results to predict the fatigue life of X20 steels.The cyclic deformation is also discussed by utilizing stress-strain cycles.

关 键 词：X20耐热钢 单轴疲劳 疲劳特性 

分 类 号：TG142.73[一般工业技术—材料科学与工程]