柔性砂带磨削Q370R钢焊接接头组织结构与应力状态  

Microstructure and stress state of Q370R steel welded joint by flexible abrasive belt grinding

作　　者：任绪凯 杜锡勇 余焕伟 陈仙凤 宋剑华 王国彪 REN Xukai;DU Xiyong;YU Huanwei;CHEN Xianfeng;SONG Jianhua;WANG Guobiao(School of Mechanical Engineering,Tianjin University,Tianjin 300073,China;Shaoxing Special Equipment Testing Institute,Shaoxing 312071,China;Shaoxing Key Laboratory of Special Equipment Intelligent Testing and Evaluation,Shaoxing 312071,China)

机构地区：[1]天津大学机械工程学院,天津300073 [2]绍兴市特种设备检测院,绍兴312071 [3]绍兴市特种设备智能检测与评价重点实验室,绍兴312071

出　　处：《理化检验(物理分册)》2025年第1期25-29,共5页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：采用X射线衍射技术、衍射线形分析方法及应力测定方法分析了柔性砂带磨削对Q370R钢焊接接头组织结构特征和应力状态的影响,并与焊接态、焊接热处理态Q370R钢焊接接头试样进行对比。结果表明:热处理可以有效消除焊接残余拉应力,但对组织结构无显著影响;采用柔性砂带磨削加工去除焊缝余量时,接头表层形成了约140μm厚的塑性变形层;变形层组织由25μm厚的拉应力层及115μm厚的压应力层组成,其纳米至微米级晶畴尺寸及微观应变均呈梯度分布。The effects of flexible abrasive belt grinding on the microstructure and stress state of Q370R steel welded joints were analyzed by X-ray diffraction technology,diffraction line analysis method and stress measurement method,and compared with the welded and heat treated Q370R steel welded joint samples.The results show that heat treatment could effectively eliminate the welding residual tensile stress,but had no significant effect on the microstructure.When the weld allowance was removed by flexible abrasive belt grinding,a plastic deformation layer with a thickness of about 140μm was formed on the surface of the joint.The microstructure of the deformed layer was composed of a tensile stress layer with a thickness of 25μm and a compressive stress layer with a thickness of 115μm.The nano-to-micron domain size and micro-strain were distributed in a gradient manner.

关 键 词：Q370R钢 焊接接头 砂带磨削 组织结构 残余拉应力 晶畴 

分 类 号：TB31[一般工业技术—材料科学与工程] TG115.2[金属学及工艺—物理冶金]