屈服强度对304不锈钢SCC裂尖蠕变场及扩展速率的影响分析  

Influence of Yield Stress on the SCC Creep Mechanical Field and Growth Rate at the Tip of 304 Stainless Steel

作　　者：崔英浩 张建龙[2,3] 李晓磊 CUI Yinghao;ZHANG Jianlong;LI Xiaolei(School of Mechanical&Electronic Engineering,Zhongyuan University of Technology,Zhengzhou 450007,China;School of Mechanical Engineering,Xi’an University of Science and Technology,Xi'an 710054,China;Xi’an Special Equipment Inspection Institute,Xi'an 710065,China)

机构地区：[1]中原工学院机电学院,河南郑州450007 [2]西安科技大学机械工程学院,陕西西安710054 [3]西安特种设备检验检测院,陕西西安710065

出　　处：《铸造技术》2020年第12期1117-1121,共5页Foundry Technology

基　　金：陕西省自然科学基础研究计划项目(2020JM-523);国家市场监督管理总局科技计划项目(2019MK071)。

摘　　要：为探讨材料塑性对SCC裂尖蠕变场的影响规律,以核电常用的奥氏体304不锈钢为研究对象,采用紧凑拉伸试样建立了SCC裂尖蠕变场的有限元模型。通过材料屈服强度表征材料塑性的变化,研究了不同材料屈服强度对裂尖蠕变及蠕变率的影响规律,运用ABAQUS数值模拟软件进行分析计算。结果表明,高蠕变量区域主要集中分布在近裂尖区域内,屈服强度对SCC裂尖蠕变场的影响较大;随着屈服强度的不断增加,裂尖蠕变量以及蠕变率也在不断增加;随着蠕变的持续推进,蠕变率均趋向于同一水平;随时间的继续增加,蠕变率变化较小,同时裂纹扩展速率随着裂纹长度呈现出近似线性的增加规律。In order to investigate the influence of material plasticity on the creep field of SCC crack tip,a finite element model of SCC crack tip creep field was established by using compact tensile specimens of 304 austenite stainless steel.The influence of yield strength of different materials on crack tip creep and creep rate was studied by ABAQUS numerical simulation software and by using yield strength to characterize the plastic change of materials.The results show that the high creep variable area is mainly distributed in the near crack tip area,and the yield strength has a great influence on the creep field of SCC crack tip.With the increase of yield strength,the creep variable and creep rate of crack tip also increase.With the continuous advance of creep,the creep rate tends to the same level.With the continuous increase of time,the creep rate changed little,and the crack growth rate increased linearly with the crack length.

关 键 词：304不锈钢 应力腐蚀开裂 裂尖蠕变 蠕变率 

分 类 号：TG142[一般工业技术—材料科学与工程]