【摘要】 在600~850℃对TC4钛合金进行了0.3~80h的氧化试验,研究了氧化对其宏观形貌、截面硬度、截面形貌等的影响,分析了其高温氧化动力学行为。结果表明:随着温度的升高和氧化时间的延长,TC4钛合金表面氧化膜经历了完整→开裂→剥落→严重剥落→全部剥落的过程;钛合金近表面形成的渗氧层厚度随氧化时间的延长和温度的升高而增加;当氧化温度在600~650℃时,钛合金的氧化动力学曲线符合抛物线规律,氧化温度为750~850℃时符合线性规律,当氧化温度为700℃,氧化时间小于8h时符合抛物线规律,氧化时间超过8h时符合线性规律;不同氧化温度和时间下,硬度随距表面距离的增加而降低。更多还原

【Abstract】 Oxidation tests at 600-850 ℃for 0.3-80 hwere conducted on TC4 titanium alloy,and then the effects of oxidation on the macro morphology,cross section micro-hardness and cross section morphology of the alloy were studied.The oxidation behavior at high temperature was analyzed.The results show that with the increase of temperature and oxidation time,the surface oxide film of TC4 titanium alloy experienced the process of completion,cracking,spalling,severe spalling,peeling off completely.The thickness of oxygen diffusion layer formed on the near surface increased with the increase of temperature and oxidation time.The oxidation kinetics curve complied with parabolic law when the oxidation temperature was 600-650 ℃,linear law when the oxidation temperature was 750-850℃,parabolic law in the first 8 hoxidation and linear law with the oxidation time of more than 8 h when the oxidation temperature was 700 ℃.The hardness decreased with the distance from surface increasing at different oxidation temperatures for different times.更多还原