高能喷丸对R60702焊接接头组织性能的影响  

Effect of High Energy Shot Peening on Microstructure and Properties of R60702 Welded Joints

作　　者：李宁 张敏[1] 雒设计[3] 叶建林 李丰博 郑敏 Li Ning;Zhang Min;Luo Sheji;Ye Jianlin;Li Fengbo;Zheng Min(School of Materials Science and Engineering,Xi’an University of Technology,Xi’an 710048,China;Xi’an United Pressure Vessel Co.,Ltd,Xi’an 710201,China;School of Materials Science and Engineering,Xi'an Shiyou University,Xi'an 710065,China)

机构地区：[1]西安理工大学材料科学与工程学院,陕西西安710048 [2]西安优耐特容器制造有限公司,陕西西安710201 [3]西安石油大学材料科学与工程学院,陕西西安710065

出　　处：《稀有金属材料与工程》2021年第6期2100-2105,共6页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51974243)。

摘　　要：采用表面高能喷丸工艺(HESP)对工业纯锆(R60702)焊接接头进行处理,利用金相显微镜(OM)、X射线衍射(XRD)和背散射电子衍射(EBSD)方法表征微观组织、表层晶粒尺寸、微观畸变、梯度结构和晶体取向,利用表面粗糙度测量仪测量评定表面粗糙度,利用电化学工作站研究了R60702焊接接头耐腐蚀性能。结果表明,工业纯锆焊接接头经HESP处理后,试样表层形成厚约110μm的梯度结构,最表层晶粒达到纳米量级;在表面纳米化过程中,孪晶和位错滑移是主要的变形方式;HESP处理后,R60702焊接接头自腐蚀电位正移,腐蚀电流密度降低;HESP处理使焊接接头3个区域的表层组织均一化,自腐蚀电位基本趋于一致,有利于抑制电偶腐蚀。The welded joint of industrial pure zirconium(R60702) was treated by surface high energy shot peening(HESP). The microstructure, surface grain size, micro distortion, gradient structure and crystal orientation were characterized by optical microscope(OM), X-ray diffraction(XRD) and electron back scattered diffraction(EBSD). A surface roughness measuring instrument was used to measure and evaluate the surface roughness, and an electrochemical workstation was used to study the corrosion resistance of R60702 welded joints. The results show that after HESP treatment, a gradient structure is formed on the surface layer of the industrial pure zirconium welded joints with a thickness of about 110 μm, and the grains of top layer reach the nanometer level. In the process of surface nanocrystallization, twins and dislocation slip are the main deforming mechanism. After HESP treatment, the self-corrosion potential of R60702 welded joints is positively shifted, and the corrosion current density is reduced. HESP treatment makes the surface structure of the three areas of the welded joints uniform, and the self-corrosion potential tends to be uniform, which effectively inhibits galvanic corrosion.

关 键 词：高能喷丸 工业纯锆 组织性能 耐腐蚀性能 

分 类 号：TG146.414[一般工业技术—材料科学与工程]