Effect of surface oxide on decarburization reaction in the austenitic steel S304HCu

Author:

Zurek Joanna1,Cosler Heiko1,Quadakkers Willem Joseph1,Naumenko Dmitry1

Affiliation:

1. Forschungszentrum Jülich GmbH

Abstract

Abstract In the present work, the high temperature decarburization of the austenitic stainless steel S304HCu in Ar-(4%H2)-x H2O at temperatures between 1000 and 1150°C was investigated. The focus was on determining parameters that influence the decarburization rate during heat treatment. Thermogravimetric experiments were performed with simultaneous measurements of CO release from the sample using a mass spectrometer. The variation of the experimental parameters included the composition of the atmosphere during pre-oxidation and decarburization, the temperature and the sample thickness. The results indicate that the loss of carbon from the specimen occurs faster through reaction of Cr2O3 with C from the steel compared to the reaction of C at the steel surface with H2O, provided that in the former case CO can easily evaporate. The overall decarburization process is governed by competing reactions; the destruction of chromium oxide by C and the formation of oxide scale by water vapour. The relative rates of these two reactions determines whether decarburization will occur or whether formation of a protective oxide stops the release of CO, the latter being promoted at lower temperatures and high water vapour contents. A dense, sufficiently thick chromia scale retards the onset of decarburization but does eventually not stop the carbon loss. Indications were found that the destruction of a pre-formed chromia scale by carbon involves a two-step process whereby presence of hydrogen is important.

Publisher

Research Square Platform LLC

Reference33 articles.

1. Kinetics of carburization and decarburization of iron and iron-10% nickel in CH4-H2 mixtures Scripta Metallurgica;Grabke H-J,1980

2. Influence of Carbide Morphology and Microstructure on the Kinetics of Superficial Decarburization of C-Mn Steels;Alvarenga HD;Metallurgical and Materials Transactions A,2015

3. Hilinski EJ, Johnston GH. Annealing of electrical steel 2014 4th International Electric Drives Production Conference (EDPC). 2014:1–7; Zeng W, Guo Y, Dai F, Pan L, Lei Y, Liu T. Mechanism of silicon distribution and oxide morphology in the internal oxidation zone of grain-oriented silicon steel during decarburization Corrosion Science. 2023;221:111251.

4. Prediction of Decarburized Ferrite Depth of Hypoeutectoid Steel with Simultaneous Oxidation;Choi S;ISIJ International,2012

5. Birks N, Meier GH, Pettit FS Introduction to the High Temperature Oxidation of Metals. City: Cambridge University Press, UK; 2006.

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3