高钢级管线环焊缝强度匹配的仪器化压痕法测试研究  

Study on indentation test for the strength of the girth welds of high-strength pipelines steels

作　　者：孙永辉[1] 尤景泽 刘凯 柳旺 周天宇 翟建明[1] 王汉奎[1] SUN Yonghui;YOU Jingze;LIU Kai;LIU Wang;ZHOU Tianyu;ZHAI Jianming;WANG Hankui(China Special Equipment Inspection&Research Institute,Beijing 100029,China)

机构地区：[1]中国特种设备检测研究院,北京100029

出　　处：《压力容器》2023年第11期26-32,共7页Pressure Vessel Technology

基　　金：中国特种设备检测研究院内部项目“高钢级天然气管道焊接及检测评价研究”(2020-内02)。

摘　　要：为获得在役管线环焊缝强度及与母材的强度匹配情况,选用仪器化压痕法对高钢级管线环焊缝的强度及匹配情况进行检测。为验证仪器化压痕法检测结果的准确性,对经过压痕检测的环焊缝取常规拉伸试样进行检测并对比结果。两种强度测试方法的结果对比表明,压痕测试的屈服强度比拉伸测试结果高约6%、抗拉强度比拉伸测试高约16%。利用阵列硬度对焊缝及母材的硬度分布进行表征,发现焊缝内硬度分层分布、近外壁区域硬度较高,母材硬度相对均匀。仪器化压痕测试的材料为近外壁的高硬度区,拉伸测试的材料为管道壁厚的平均结果,材料性能的沿厚度方向的分布特征是压痕法测得结果偏高的原因之一。In order to obtain the strength matching of the girth weld and the base metal of the in-service pipeline,the instrumented indentation method was used to test the strength.The instrumented indentation method was used to test the strength and strength matching of the girth weld of the high grade steel pipeline.In order to verify the accuracy of the indentation test results,the conventional tensile specimen was taken from the girth weld subjected to indentation test,and the results were compared.The results of the two strength test methods show that the yield strength determined by indentation test is about 6%higher than the results by conventional tensile test,and the tensile strength is about 16%higher.The array hardness test is used to characterize the material properties of the weld and the base material.It is found that the hardness near the outer wall is higher,and the hardness of the base material is relatively uniform.The material tested by instrumented indentation method is the high hardness zone near the outer wall,the results for the material subjected to tensile test are the average results along the wall thickness.The distribution characteristics of material properties along the wall thickness direction is one of the causes for higher results measured by indentation method.

关 键 词：管线钢环焊缝 强度匹配 仪器化压痕 屈服强度 抗拉强度 

分 类 号：TH142[一般工业技术—材料科学与工程] TE973[机械工程—机械制造及自动化] X924.2[石油与天然气工程—石油机械设备]