钛合金TC4高温氧化特性研究

来源期刊：钢铁钒钛2010年第4期

论文作者：杨雄飞 黄德明 韦青峰 赵同新

文章页码：16 - 21

关键词：钛合金； TC4； 氧化行为； 内氧化

Key words：titanium alloy； TC4； oxidation behavior； internal oxidation

摘    要：研究了最常用钛合金TC4在850~1 050℃的高温氧化特性,采用光学、扫描电镜观察、分析氧化层及富氧层形貌。结果表明,在研究的温度与加热时间范围内,TC4单位表面积氧化增重基本呈线性增长的规律;α单相区850℃温度加热的氧化皮形貌与950、1 000、1 050℃下明显不同。氧化过程中出现的内氧化层平均厚度仅和特定加热温度的氧扩散速率相关,与加热时间无关。此外,在富氧层内发现V的强烈富集。

Abstract: The oxidation behaviors of most widely used titanium alloy TC4 was investigated at four different atmosphere temperatures ranging from 850℃ to 1 050℃.The morphology of the oxidation and oxide-rich layer of TC4 was analyzed by OM and SEM.The results indicated that the oxidation layer weight addition per unit surface area of TC4 showed a nearly linear relation to exposed heating time.Oxidation skin of TC4 formed by oxidation at single α phase range of lower temperature 850℃ was completely different that at 950,1 000℃ and 1 050℃.The mean thickness of internal oxidation layer was found strongly depending on oxygen diffusion rate at certain heating temperature and independent of heating time.Moreover,vanadium was found readily being enriched within oxide-rich layer.