Nitridation of Three Austenitic Alloys at 1100 °C

IF 2.1 3区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING
T. Sand, A. Rajagopal, M. Sattari, S. Bigdeli, M. Hättestrand, J.-E. Svensson, M. Halvarsson, L.-G. Johansson
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引用次数: 0

Abstract

The nitridation of three austenitic high-temperature alloys in 95% N2 + 5% H2 environment at 1100 °C was evaluated in terms of gravimetry and investigated by SEM–EDS, EPMA and STEM. Samples made from Alloy 600, 253 MA and 353 MA were exposed for 1 day, 1 week and 3 weeks. Alloy 600 underwent very little nitridation, while 253 MA and especially 353 MA, were heavily affected by nitride precipitation. The nitridation of all three alloys had reached equilibrium after three weeks; the extent of nitridation depending on the chromium activity in the alloy. The kinetics of nitrogen ingress into the alloy depends on nickel concentration, while the rate-determining step in the nitridation process is the nucleation and growth of the nitride precipitates.

三种奥氏体合金在1100℃下的氮化
用重量法对3种奥氏体高温合金在1100℃95% N2 + 5% H2环境下的氮化行为进行了评价,并用SEM-EDS、EPMA和STEM分析了氮化行为。由合金600、253 MA和353 MA制成的样品分别暴露1天、1周和3周。合金600的渗氮作用很小,而253 MA和353 MA的渗氮作用较大。三周后,三种合金的氮化均达到平衡;氮化程度取决于合金中铬的活度。氮进入合金的动力学取决于镍的浓度,而氮化过程的速率决定步骤是氮化物析出相的形核和生长。
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来源期刊
Oxidation of Metals
Oxidation of Metals 工程技术-冶金工程
CiteScore
5.10
自引率
9.10%
发文量
47
审稿时长
2.2 months
期刊介绍: Oxidation of Metals is the premier source for the rapid dissemination of current research on all aspects of the science of gas-solid reactions at temperatures greater than about 400˚C, with primary focus on the high-temperature corrosion of bulk and coated systems. This authoritative bi-monthly publishes original scientific papers on kinetics, mechanisms, studies of scales from structural and morphological viewpoints, transport properties in scales, phase-boundary reactions, and much more. Articles may discuss both theoretical and experimental work related to gas-solid reactions at the surface or near-surface of a material exposed to elevated temperatures, including reactions with oxygen, nitrogen, sulfur, carbon and halogens. In addition, Oxidation of Metals publishes the results of frontier research concerned with deposit-induced attack. Review papers and short technical notes are encouraged.
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