Fatigue Limit Improvement and Rendering a Defect Harmless for Stainless Steel Welded Joint Containing a Crack-like Surface Defect
Fatigue Limit Improvement and Rendering a Defect Harmless for Stainless Steel Welded Joint Containing a Crack-like Surface Defect
复制标题
含裂纹表面缺陷的不锈钢焊接接头的疲劳极限改进及缺陷无害化
DOI：
10.11181/hpi.57.82
复制
发表时间：
2019
期刊：
影响因子：
--
通讯作者：
澁谷紀仁
中科院分区：
文献类型：
--
作者：
笛木隆太郎;高橋宏治;粂野文亮;澁谷紀仁
研究了激光喷丸对JIS-SUS316奥氏体不锈钢焊接接头弯曲疲劳极限的影响。通过测量几种低压条件下的残余应力分布，确定了对提高疲劳极限有较好效果的最佳低压条件。然后，在应力比R=0.05的条件下，对带缝隙和不带缝隙的LP处理焊接试件进行了三点弯曲疲劳试验。由于LP，所有试件的疲劳极限都提高了23-%。缝隙深度为a=0.2 mm的LP处理试件的疲劳极限较高，与未缝隙的LP处理试件的疲劳极限几乎相同。因此，小于a=0的半圆形狭缝。2 mm可因LP而变得无害。疲劳极限的提高主要是通过压缩残余应力来实现的。
The effects of laser peening (LP) on the bending fatigue limit of an austenitic stainless steel JIS-SUS316 welded joint containing an artificial semi-circular slit on the weld toe were investigated. The optimum LP condition which was expected to have a good effect in fatigue limit improvement was determined by measuring the residual stress distributions for several LP conditions. Then, three-point bending fatigue tests were carried out at a stress ratio of R= 0.05 for both LP treated welded specimens with the slit on the weld toe and those without the slit. The fatigue limits of all specimens increased by 23-64% due to LP. LP treated specimens with a slit depth of a= 0.2 mm had high fatigue limits that were nearly equal to those of non-slit, LP treated specimens. Therefore, a semi-circular slit of less than a= 0. 2 mm could be rendered harmless due to LP. The improvement of fatigue limit due to LP was mainly achieved by compressive residual stress.