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首页> 外文期刊>Journal of Materials Science >Weld decay-resistant austenitic stainless steel by grain boundary engineering
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Weld decay-resistant austenitic stainless steel by grain boundary engineering

机译：晶界工程焊接抗腐蚀奥氏体不锈钢

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摘要

This paper presents an example of grain boundary engineering (GBE) for improving intergranular-corrosion and weld-decay resistance of austenitic stainless steel. Transmission and scanning electron microscope (TEM and SEM) observations demonstrated that coincidence site lattice (CSL) boundaries possess strong resistance to intergranular precipitation and corrosion in weld decay region of a type 304 austenitic stainless steel weldment. A thermomechanical treatment for GBE was tried for improvement of intergranular corrosion resistance of the 304 austenitic stainless steel. The grain boundary character distribution (GBCD) was examined by orientation imaging microscopy (OIM). The sensitivity to intergranular corrosion was reduced by the thermomechanical treatment and indicated a minimum at a small roll-reduction. The frequency of CSL boundaries indicated a maximum at the small roll-reduction. The corrosion rate was much smaller in the thermomechanical-treated specimen than in the base material for long time sensitization. The optimum thermomechanical treatment introduced a high frequency of CSL boundaries and the clear discontinuity of corrosive random boundary network in the material, and resulted in the high intergranular corrosion resistance arresting the propagation of intergranular corrosion from the surface. The optimized 304 stainless steel showed an excellent resistance to weld decay during arc welding.
机译：本文介绍了一个用于改善奥氏体不锈钢的晶间腐蚀和耐焊接衰减性的晶界工程（GBE）实例。透射和扫描电子显微镜（TEM和SEM）的观察结果表明，重合点晶格（CSL）边界对304型奥氏体不锈钢焊缝的焊缝衰减区域具有较强的抗晶间析出和腐蚀的能力。为了改善304奥氏体不锈钢的耐晶间腐蚀性，尝试了GBE的热机械处理。通过取向成像显微镜（OIM）检查了晶界特征分布（GBCD）。通过热机械处理降低了对晶间腐蚀的敏感性，并且在小辊减量下显示出最小的敏感性。 CSL边界的频率在小滚动减少时显示最大值。对于长时间的敏化，在热机械处理的样品中腐蚀速率比在基材中小得多。最佳的热机械处理在材料中引入了高频率的CSL边界和腐蚀性随机边界网络的明显不连续性，并导致较高的耐晶间腐蚀能力，阻止了晶间腐蚀从表面的传播。经过优化的304不锈钢在电弧焊过程中表现出出色的抗焊接衰减性能。

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  • 来源
    《Journal of Materials Science》 |2005年第4期|927-932|共6页
  • 作者

    H. KOKAWA;

  • 作者单位

    Department of Materials Processing Graduate School of Engineering. Tohoku University;

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  • 正文语种 eng
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