电镀硬铬工艺对TC6钛合金性能的影响研究

研究了电镀硬铬工艺对TC6钛合金的影响,利用氢测定仪、拉伸试验机、疲劳试验机等设备对镀铬后TC6钛合金的氢含量、力学和疲劳等性能进行了研究。结果表明:TC6钛合金电镀硬铬后基体氢含量显著提高,氢含量合格但接近上限,不能通过氢脆实验。建议TC6钛合金电镀硬铬工艺不应用在高应力集中及高承载部位,以避免氢脆发生。抗拉强度基本不变,伸长率和断面收缩率有所降低,分别降低17.3%和24.0%。TC6钛合金电镀硬铬后由于镀层造成的残余拉应力,使得疲劳极限显著降低,由626.0MPa降低至201.3MPa。

Effects of Hard Chromium Electroplating on Performance of TC6 Titanium Alloy

The influences of chromium electroplating on hydrogen content,mechanical and fatigue properties of TC6 titanium alloy were studied by hydrogen testing equipment,tensile testing machine and fatigue testing machine.The results show that the hydrogen content of TC6 titanium alloy increased after chromium electroplating up to the top limit of the acceptance range.The hydrogen brittleness specimens made of TC6 were failure in the hydrogen embrittlement test.So these materials with chromium coating were not suggested to use for high stress concentration and load-carrying structure.The tensile strength of TC6 was kept constant.The elongation decreased by 17.3%,and section reduction decreased by 24.0%.The fatigue strength of TC6 after chromium electroplating decreased significantly from 626.0 MPa to 201.3 MPa by the tensile stress of chromium coatings.