Quantitative description of the microstructure of duplex stainless steels using selective etching

Proceedings of The 1st International Electronic Conference on Metallurgy and Metals Pub Date : 2021-03-08 DOI:10.3390/IEC2M-09387

A. Fedorov, A. Zhitenev, D. Strekalovskaya, A. Kur

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引用次数: 4

Abstract

: The properties of duplex stainless steels (DSSs) depend on the ferrite–austenite ratio and on the contents of secondary phases. Therefore, it is necessary to control the volume fractions, morphologies, and distribution patterns of all phases. The phases in the samples were identified using thermodynamic modeling and scanning electron microscopy. Investigated specimens were obtained after different heat treatments, such as solution annealing and quenching from 1050 to 1250 °C to obtain different amounts of ferrite and annealing at 850 °C to precipitate the σ -phase. There-fore, a metallographic technique for assessing the phases in DSSs based on selective etching and subsequent analysis according to ASTM E 1245 was developed. It was shown that the developed method of quantitative analysis based on selective etching and metallographic assessment according to ASTM E 1245 allows obtaining much more accurate results compared to the proposed ASTM E 562 method, which correlates well with the XRD quantitative phase analysis.

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用选择性蚀刻法定量描述双相不锈钢的显微组织

双相不锈钢(DSSs)的性能取决于铁素体-奥氏体比和二次相的含量。因此，有必要控制各相的体积分数、形态和分布模式。利用热力学模型和扫描电镜对样品中的相进行了鉴定。试样经过固溶退火和1050 ~ 1250℃淬火得到不同数量的铁素体，850℃退火析出σ相。因此，根据ASTM E 1245开发了一种基于选择性蚀刻和后续分析的金相技术来评估DSSs中的相。结果表明，与ASTM E 562方法相比，基于ASTM E 1245的选择性蚀刻和金相评估的定量分析方法可以获得更准确的结果，并且与XRD定量相分析具有良好的相关性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Proceedings of The 1st International Electronic Conference on Metallurgy and Metals

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