外科植入用TA3钛合金接骨板断裂失效分析

Fracture Failure Analysis of TA3 Titanium Alloy Blade Plates for Surgical Implants

某批次外科植入用TA3钛合金接骨板在使用过程中出现断裂问题,但该批次板材依据GB/T 13810-2007进行检测是合格的。通过金相检验、扫描电镜能谱分析、表面和截面硬度试验等方法,分析了该批次钛合金板材断裂的原因。结果表明:由于该批钛合金板材表面富氧形成硬而脆的污染层,在变形时极易产生微裂纹,从而导致其在使用过程中发生断裂;同时分析认为利用逐渐加大试验载荷测试TA3钛合金板材表面维氏硬度的方法,可以作为分析TA3钛合金板材表面是否存在污染层的一种方法。

Fracture happened to a batch of TA3 titanium alloy blade plates for surgical implants during use. However, this batch of plates was qualified according to GB/T 13810-2007. Through metallographic examination, scanning electron microscope and energy spectrum analysis, surface and cross-sectional hardness test and so on, the fracture reasons of this batch of TA3 titanium alloy plates were analyzed. The results show that hard and brittle oxygen-rich contamination layer formed on the surface of this batch of titanium alloy plates, so micro cracks easily formed when they were deformed, which resulted in their fracture during use. At the same time, the method of testing the surface Vickers hardness by increasing test load step by step could be used as a means to determine whether there is a layer of contaminants on the surface of TA3 titanium alloy plate.