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首页> 外文期刊>Corrosion science >Residual stress analysis in thermally grown oxide scales developed on Nb-alloyed refractory austenitic stainless steels
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Residual stress analysis in thermally grown oxide scales developed on Nb-alloyed refractory austenitic stainless steels

机译:Nb合金耐火奥氏体不锈钢上产生的热生长氧化物尺度的残余应力分析

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摘要

Reliable high temperature operation of refractory metals depends on the mechanical integrity of the protective oxide formed on the material surface. The residual stress state in oxide layers developed on two modified Nb-alloyed ASTM A297 HH austenitic stainless steels, thermal expansion analysis of the substrate, steel microstructure, oxide layers morphology and phases composition were analyzed. The experimental analyses revealed that larger Nb additions increased NbC precipitates, which was connected to lower thermal expansion coefficient of the substrate. Despite similarities in the oxide scales, the higher Nb-alloyed samples exhibited lower magnitude residual stress values and larger spallation after long-term oxidation.
机译:可靠的难熔金属的高温操作取决于在材料表面上形成的保护氧化物的机械完整性。分析了氧化物层中的残留应力状态在两个改性的Nb合金ASTM A297 HH奥氏体不锈钢,基板的热膨胀分析,钢微观结构,氧化物层形态和阶段组合物。实验分析显示,较大的Nb添加增加的NbC沉淀物,其连接到底板的较低的热膨胀系数。尽管在氧化物鳞片中存在相似性,但较高的Nb合金样品在长期氧化后表现出较低的幅度残余应力值和较大的介质。

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  • 来源
    《Corrosion science》 |2021年第1期|109066.1-109066.8|共8页
  • 作者单位

    Pontificia Univ Catolica Minas Gerais Dept Mech Engn Av Dom Jose Gaspar 500 Belo Horizonte MG Brazil|Saarland Univ Chair Funct Mat D-66123 Saarbrucken Saarland Germany;

    SENAI CIMATEC Inst Innovat Forming & Joining Mat Av Orlando Gomes 1845 BR-41650010 Salvador BA Brazil;

    Saarland Univ Chair Funct Mat D-66123 Saarbrucken Saarland Germany;

    Univ Sao Paulo EESC Sao Carlos Sch Engn Dept Mat Engn SMM Sao Carlos SP Brazil;

    Saarland Univ Chair Funct Mat D-66123 Saarbrucken Saarland Germany;

    Pontificia Univ Catolica Minas Gerais Dept Mech Engn Av Dom Jose Gaspar 500 Belo Horizonte MG Brazil;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Heat resistant steel; residual stress analysis; niobium; high temperature oxidation; thermal expansion;

    机译:耐热钢;残留应力分析;铌;高温氧化;热膨胀;

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