In this study, Ti–6Al–4V welded joints were subjected to a high-energy shot peening (HESP) treatment. The structural characteristics of the Ti–6Al–4V welded joints were investigated by optical microscopy (OM) and x-ray diffraction (XRD). The Rockwell hardness and residual stress in different regions of the Ti–6Al–4V welded joints were assessed before and after treatment. Tension tests were then performed to investigate the effect of HESP on the welded samples. Experimental results showed that an Surface nanocrystallization (SNC) layer can be prepared on a Ti–6Al–4V welded joint via HESP. The average grain size of the SNC layer was approximately 30 nm after HESP. HESP also resulted in a higher surface hardness compared with that of the original sample. After treatment, surface compressive residual stresses formed in welded joints, and the residual peak stress of the weld zone was decreased from 650 MPa to −638 MPa. The surface hardness and surface residual stress were distributed...

中文翻译：

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高能喷丸处理对Ti-6Al-4V焊接接头组织和力学性能的影响

在这项研究中，对Ti-6Al-4V焊接接头进行了高能喷丸处理（HESP）处理。通过光学显微镜（OM）和X射线衍射（XRD）研究了Ti-6Al-4V焊接接头的结构特征。在处理前后，评估了Ti-6Al-4V焊接接头不同区域的洛氏硬度和残余应力。然后进行张力测试以研究HESP对焊接样品的影响。实验结果表明，可以通过HESP在Ti-6Al-4V焊接接头上制备表面纳米晶（SNC）层。HESP之后，SNC层的平均晶粒尺寸约为30 nm。与原始样品相比，HESP还导致更高的表面硬度。处理后，在焊接接头中形成表面压缩残余应力，焊接区的残余峰值应力从650 MPa降低到-638 MPa。表面硬度和表面残余应力分布...