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Development of an Oxidation Method for Prior Austenite Grain Boundary Revelation

机译：先前奥氏体晶界揭示氧化方法的研制

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摘要

The prior austenite grain size is a very important quantitative parameter which has a great influence on steel final microstructure and properties. Therefore, its measurement is a useful metallographic tool. To measure the austenitic grain size, it is necessary to reveal the prior austenitic grain boundaries by applying contrast methods. The technical literature reports many limitations to achieve satisfactory results using known methods that are, generally, susceptible to steel chemical composition and processing routes. In this context, this study proposed an oxidation method to reveal the prior austenite grain boundaries in different steel grades. This method was evaluated in the samples of AISI 4340 and AISI 1030 steels. Aiming to confirm the proposed technique efficiency, a parallel and classical method, based on picric acid etching, was applied to same steels. In the suggested oxidation method, the samples were mechanically ground, polished, and then austenitized in an argon atmosphere with low oxygen partial pressure. The obtained results confirm the success of the proposed method for both studied steels.
机译：先前的奥氏体晶粒尺寸是对钢最终微观结构和性质的影响非常重要的定量参数。因此，其测量是一种有用的金相工具。为了测量奥氏体晶粒尺寸，需要通过施加对比方法来揭示先前的奥氏体晶粒边界。技术文献报告了使用通常易受钢化学成分和加工途径的已知方法实现令人满意的结果的许多限制。在这种情况下，该研究提出了一种氧化方法，以揭示不同钢等级中的先前奥氏体晶界。在AISI 4340和AISI 1030钢的样本中评估该方法。旨在确认所提出的技术效率，基于灰色酸蚀刻的平行和经典方法施加到相同的钢上。在建议的氧化方法中，样品是机械研磨的，抛光，然后在具有低氧分压的氩气氛中奥氏体化。所获得的结果证实了所研究的钢上所提出的方法的成功。

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