Oxidation of Metals ( IF 2.1 ) Pub Date : 2021-07-20 , DOI: 10.1007/s11085-021-10043-w V. Optasanu 1 , M. C. Marco de Lucas 1 , A. Kanjer 1 , B. Vincent 1 , T. Montesin 1 , L. Lavisse 1
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Abstract
Isothermal oxidation tests of mechanically treated Ti-Beta-21S (TIMET, Ti–15Mo–3Nb–3Al–2Si, ASTM Grade 21) were performed under dry air at 650, 700 and 750 °C for 100 h and compared to untreated samples. Two different mechanical surface treatments were used: ultrasonic shot-peening (SP) and laser-shock peening (LSP). The study investigates the effect of both treatments on the oxidation kinetics of the process and the role of atmospheric nitrogen insertion. With this aim, oxidation experiments were also performed under pure oxygen. The results show that the oxidation is governed by diffusion after a short transient time. Both SP and LSP treatments improve the high temperature oxidation resistance of Ti-Beta-21S in dry air, but not in pure oxygen. The formation of a nitrogen-enriched layer at the oxide–metal interface, which is promoted by the mechanical surface treatments, explains the increase in the oxidation resistance in air by slowing down the diffusion of oxygen into the metal.
Graphic Abstract
中文翻译：
喷丸和激光冲击强化 Ti-Beta-21S 的高温氧化动力学
摘要
机械处理的 Ti-Beta-21S（TIMET，Ti-15Mo-3Nb-3Al-2Si，ASTM 等级 21）的等温氧化试验在 650、700 和 750 °C 的干燥空气下进行 100 小时，并与未处理的样品进行比较。使用了两种不同的机械表面处理：超声波喷丸强化 (SP) 和激光冲击强化 (LSP)。该研究调查了两种处理方法对该过程氧化动力学的影响以及大气氮插入的作用。为此，还在纯氧下进行氧化实验。结果表明，在短暂的瞬态时间后，氧化受扩散控制。SP 和 LSP 处理都提高了 Ti-Beta-21S 在干燥空气中的高温抗氧化性，但在纯氧中没有提高。在氧化物-金属界面形成富氮层，
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