硫酸环境电解对热等静压钛合金性能的影响

Effect of Electrolysis in Sulfuric Acid Environment on the Properties of Hot Isostatic Pressing Titanium Alloy

酸环境电解去除包套是热等静压成形复杂钛合金构件的关键工序之一。针对目前酸环境电解对热等静压钛合金性能影响研究较少的现状,研究在40℃的硫酸溶液中,不同电解时间对热等静压TA15钛合金表面钝化膜、氢含量和力学性能的影响。结果表明:电解时间分别为15、30、45、60 d时,热等静压TA15钛合金表面钝化膜厚度逐渐增加,到60 d时钝化膜厚度达到了175.3μm;氢含量在15 d时增幅非常小,平均值低于2×10^(-5),30 d后则显著增加,到60 d时平均氢含量达到5.4×10^(-4);热等静压TA15材料屈服和抗拉强度随着电解时间的延长逐渐降低,塑性变化不大。硫酸环境电解直接影响热等静压钛合金材料的表面质量和力学性能,后续需强化工艺控制。

Removal of tooling by electrolysis was one of the key procedure in hot isostatic pressing(HIP)of complex titanium alloy components.Based on the current studies,there were few works on the properties of titanium alloy prepared by HIP in sulfuric acid environment.The effects of different electrolysis time on the performance of HIP TA15 titanium alloy such as surface passive film,hydrogen content and mechanical properties under 40%sulfuric acid environment were studied.The results show that the thickness of passive film on the surface of TA15 titanium alloy increases gradually at 15,30,45,60 d respectively,and reaches to 175.3μm at 60 d.The increase of hydrogen content is not significant at 15 d with an average of less than 2×10^(-5).After 30 d,the average hydrogen content increases remarkably and reaches to 5.4×10^(-4) at 60 d.The yield and tensile strength of HIP TA15 titanium alloy decreases gradually with the prolonging of electrolysis time,while the plasticity is basically unchanged.The surface qualities and mechanical properties of HIP titanium alloy are effected by the time of electrolysis in sulfuric acid environment,subsequent process control need to be strengthened.