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  • 《Optics & Laser Technology》
    年:2017   卷:92   期数:   ISSN:0030-3992   点击量:1261
    Title:    Evolution of plastic deformation and its effect on mechanical properties of laser additive repaired Ti64ELI titanium alloy
    文章编号:    20170013
    作者:     
                
    Author(s):     Zhuang Zhao, Jing Chen, Hua Tan, Xin Lin, Weidong Huang
                
    关键词:    
    Keywords:     Ti64ELI titanium alloy; Laser additive repair; Digital image correlation; Plastic deformation; Mechanical properties
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    摘要:     
    Abstract:     In this paper, laser additive manufacturing (LAM) technology with powder feeding has been employed to fabricate 50%LAMed specimens (i.e. the volume fraction of the laser deposited zone was set to 50%). With aid of the 3D-DIC technique, the tensile deformation behavior of 50%LAMed Ti64ELI titanium alloy was investigated. The 50%LAMed specimen exhibits a significant characteristic of strength mismatch due to the heterogeneous microstructure. The tensile fracture of 50%LAMed specimen occurs in WSZ (wrought substrate zone), but the tensile strength is slightly higher and the plastic elongation is significantly lower than that of the wrought specimen. The 3D-DIC results shows that the 50%LAMed specimen exhibits a characteristic of dramatic plastic strain heterogeneity and the maximal strain is invariably concentrated in WSZ. The ABAQUS simulation indicates that, the LDZ (laser deposited zone) can constrain the plastic deformation of the WSZ and biaxial stresses develop at the interface after yielding.
    页码:     36-43
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    激光增材修复Ti64ELI合金的塑性变形及其对力学性能的影响
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