激光增材制造钛合金构件的化学抛光工艺研究

采用HNO3-HF抛光液对激光选区熔化钛合金制件进行化学抛光,以试样表面粗糙度、减薄及失重变化为指标探究了抛光过程中不同温度和时间对钛合金增材制件抛光效果的影响。通过电化学测量、拉伸试验、残余应力测试等方法对比分析了化学抛光前后钛合金试样的电化学和力学性能。结果表明在温度30℃、反应时间10min下抛光钛合金可以取得较理想的抛光效果,试样表面粗糙度减小、耐腐蚀性能提高。化学抛光后钛合金的强度出现小幅下降,内部原有的残余应力由拉应力转变为压应力。

Chemical Polishing of Titanium Alloy Shaped by Laser Additive Manufacturing

The shaped Ti-6Al-4V alloy parts manufactured by laser additive technology were polished using HNO3-HF chemical solution.Influences of temperature and time on the polishing effects of titanium alloy were investigated by taking the surface roughness,thinning and weight loss as indicators.The electrochemical and mechanical properties of titanium alloys before and after chemical polishing were analyzed by the electrochemical measurement,tensile test and residual stress test.The results showed that favorable polishing effect of the titanium alloy was achieved at polishing conditions of 30°C and 10 minutes,and the surface roughness reduced and corrosion resistance improved.After chemical polished,the strength of titanium alloy decreased slightly,and the residual stress of samples transformed from the tensile stress to a compressive stress.