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Residual stress development during nitriding of steels

机译：渗氮过程中残余应力的产生

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摘要

Nitriding is a well-established thermochemical surface treatment of carbon micro-alloyed steels aiming enhancing surface properties such as fatigue, wear and corrosion resistances.The idea is taking benefits from the high hardening level due to a fine nitride precipitation and also the compressive residual stress state.Due to some complex interactions of phenomena during nitriding, the last has not been completely explained yet.When interest is focused on stress depth gradient and time evolution, difficulties find origins in pronounced heterogeneities whether it is the chemical gradient due to nitrogen diffusion, the resulting gradient of microstructure or the gradient of volumetric misfits.Relaxation of residual stresses is so usually described using a thermally controlled creep phenomenon due to the couple of diffusion and stress, but depend on phenomenological descriptions.A key point is also disregard that is the diffusion of carbon and its redistribution across the nitrided surface during the treatment.Based on experimental characterizations of model carbon iron-based alloys, the role of phase transformations, especially carbides, is explored in order to give better understandings of the residual stress development during nitriding.
机译：渗氮是一种成熟的碳微合金钢热化学表面处理方法，旨在提高表面性能（如抗疲劳，耐磨性和耐腐蚀性），该想法是由于细微的氮化物沉淀以及压缩残余应力而受益于高硬化水平由于氮化过程中某些复杂的现象相互作用，最后一个现象尚未完全解释。当人们关注应力深度梯度和时间演变时，无论是氮扩散引起的化学梯度，还是很难找到明显异质性的起源，因此，残余应力的松弛通常是使用热控制蠕变现象来描述的，这是由于扩散和应力耦合引起的，但取决于现象学的描述。碳的扩散及其在氮化表面上的重新分布根据模型碳铁基合金的实验特性，探索相变的作用，尤其是碳化物，以便更好地了解渗氮过程中残余应力的发展。

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  • 来源
    《Materials science forum》 |2011年第2011期|p.370-373|共4页
  • 作者

    Sebastien Jegou; Laurent Barrallier; Regis Kubler;

  • 作者单位

    Arts & Metiers ParisTech, MecaSurf Laboratory, 2 cours des Arts et Metiers, 13617 Aix-en-Provence,France;

    Arts & Metiers ParisTech, MecaSurf Laboratory, 2 cours des Arts et Metiers, 13617 Aix-en-Provence,France;

    Arts & Metiers ParisTech, MecaSurf Laboratory, 2 cours des Arts et Metiers, 13617 Aix-en-Provence,France;

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

    nitriding; precipitation; residual stress; modelling;

    机译：氮化沉淀;残余应力造型;

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