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钛合金暴露在高温大气中,由于氧氢氮的渗入,在合金表面形成硬化的α壳层,而β相的相对含量减少以及在α钛中形成间隙固溶体,致使合金的韧性下降,硬度与脆性增加。但是,适当地控制暴露条件,表面硬化层与间隙固溶体会增加某些钛合金的蠕变抗力和破断寿命。本研究表明:Ti—6Al—4V合金在一定的应力和温度范围内,900℃暴
Titanium alloy exposed to high temperature atmosphere, due to the infiltration of oxygen and hydrogen nitrogen, forming a hardened α shell on the surface of the alloy, and the relative content of β phase reduction and the formation of interstitial solid solution in the α titanium, resulting in decreased toughness alloy, hardness and brittleness increase. However, proper control of exposure conditions, surface hardened layers and interstitial solid solutions can increase the creep resistance and fracture life of certain titanium alloys. This study shows that: Ti-6Al-4V alloy in a certain range of stress and temperature, 900 ℃ storm