2205不锈钢焊接接头疲劳裂纹扩展试验及分析  

2205 Duplex Stainless Steel Welded Joint Fatigue Crack Growth Test and Analysis

作　　者：张帅谋[1] 张雪峰 陈彪[3] 

机构地区：[1]安徽机电职业技术学院机械工程系,安徽芜湖214000 [2]新疆油田公司工程技术研究院采油机械研究所,新疆克拉玛依834000 [3]华中科技大学先进制造装备国家重点实验室,湖北武汉430074

出　　处：《佳木斯大学学报（自然科学版）》2015年第2期265-267,270,共4页Journal of Jiamusi University：Natural Science Edition

基　　金：安徽省自然科学研究项目(KJ2012Z045)

摘　　要：采用IGTB逆变式CO2气体保护焊对2205双相不锈钢进行焊接,形成焊接接头;并根据标准GB6398-2000对接头进行疲劳裂纹扩展试验.通过疲劳裂纹扩展速率测试,利用Matlab软件和Paris线性回归方程分析数据,得到对接接头上焊缝区、热影响区和母材区的疲劳裂纹扩展速率lg(da/d N)-lgΔK曲线.结果显示,给定的应力比工作条件下,疲劳裂纹在对接接头各区域的扩展速率差别较大,热影响区的扩展速率较快,母材次之,焊缝金属最慢.并利用SEM方法观察了疲劳断口,分析了产生疲劳裂纹扩展速率不同的原因.2205 duplex stainless steel was welded using IGTB inverter type CO2 gas shielded welding. According to the standard GB6398- 2000,the fatigue crack growth test of welded joint was carried out. Through testing the fatigue crack growth rate,and using Matlab software and Paris equation of linear regression analysis of data,the fatigue crack growth rate lg（ da / d N）- lgΔK curve of different regions of the butt joint was gotten.The results show that the difference between butt joint＇s fatigue crack growth rates is remarkable at the same stress ratio. The heat affected zone＇s fatigue crack growth rate is the fastest while the welding zone is the lowest. The fatigue fracture was observed using SEM method,and the reason why the difference between butt joint ＇s fatigue crack growth rates is remarkable was interpreted.

关 键 词：2205双相不锈钢 疲劳裂纹 焊接接头 疲劳断口 

分 类 号：TG115.51[金属学及工艺—物理冶金]