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由于钛及钛合金材料在生产中经常需要加热,在加热过程中,钛棒材表面会很快形成一层坚硬的氧化层。钛材表面形成的氧化层是由钛的氧化物(TiO2)和α层两部分组成。氧化层对棒材的力学性能和使用影响很大,所以必须采用磨削或车削方式去除。研究氧化层厚度与加热制度和加热时间的关系,对于指导生产工艺人员制定合理的车削或磨削工艺,降低生产成本,提高生产效率都有十分重要的意义。本文讨论了用金相法测定TC4合金棒材的α层厚度时,加热温度、加热时间与α层厚度的关系,采用扩散方程对该试验数据进行了校对验算。从而得出,在成品生产工序中,TC4合金棒材的α层厚度一般不超过0.15毫米。
Since titanium and titanium alloys often require heating during their production, the surface of the titanium bar quickly forms a hard oxide layer during heating. The titanium oxide layer is formed by the titanium oxide (TiO2) and α layer of two parts. Oxide layer on the mechanical properties of bar and use a great influence, it must be removed by grinding or turning. Studying the relationship between the thickness of the oxide layer and the heating system and the heating time is of great significance to guide the production process personnel to formulate a reasonable turning or grinding process, reduce the production cost and improve the production efficiency. In this paper, the relationship between the heating temperature and heating time and the thickness of α-layer when the α-layer thickness of TC4 alloy bar is measured by metallographic method is discussed. The diffusion coefficient is used to verify the test data. Thus, in the finished product production process, TC4 alloy bar α layer thickness is generally not more than 0.15 mm.