摘要
Selective laser melting(SLM)has provided an alternative to the conventional fabrication techniques for Ti-6Al-4V alloy parts because of its flexibility and ease in creating complex features.Therefore,this study investigated the effects of the process parameters and heat treatment on the microstructure and mechanical properties of Ti-6Al-4V fabricated using SLM.The influences of various process parameters on the relative density,tensile properties,impact toughness,and hardness of Ti-6Al-4V alloy parts were studied.By employing parameter optimization,a high-density high-strength Ti-6Al-4V alloy was fabricated by SLM.A relative density of 99.45%,a tensile strength of 1188 MPa,and an elongation to failure of 9.5%were achieved for the SLM-fabricated Ti-6Al-4V alloy with optimized parameters.The effects of annealing and solution aging heat treatment on the mechanical properties,phase composition,and microstructure of the SLM-fabricated Ti-6Al-4V alloy were also studied.The ductility of the heat-treated Ti-6Al-4V alloy was improved.By applying a heat treatment at 850℃ for 2 h,followed by furnace cooling,the elongation to failure and impact toughness were found to be increased from 9.5%to 12.5%,and from 24.13 J/cm^(2)to 47.51 J/cm^(2),respectively.
基金
The authors acknowledge the financial support provided by the Major Scientific and Technological Project of Shandong Province(Grant No.2019GGX104006)
the Natural Science Foundation of Shandong Province(Grant No.ZR2020ME159)
the Construction Engineering Special Fund of“Taishan Scholars”of Shandong Province(Grant No.ts20190975).
