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首页> 外文期刊>ISIJ international >Mechanism of Abnormal Surface Carbon Content Reduction in Nb-bearing Case Hardening Steel Gas Carburized after Machining
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Mechanism of Abnormal Surface Carbon Content Reduction in Nb-bearing Case Hardening Steel Gas Carburized after Machining

机译：机加工渗碳的含铌淬火钢气体中异常表面碳含量降低的机理

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摘要

In our previous paper, we reported that the surface carbon concentration (Cs) in carburized Nb-bearing steel decreases substantially with increasing the machining speed before carburizing. In the present study, a systematic study was made to clarify the effects of Cr,Nb addition and machining speed on the Cs. Uniform Cr oxide film was observed on the surface of specimens exhibited a large decrease in Cs. The carbon concentration profile was calculated assuming that carbon absorption was ceased after the complete coverage of specimen surface by Cr oxide film. It is confirmed that the present calculation fits well with the measured carbon concentration profile of low Cs. Moreover, it is shown that the value of Cs becomes smaller as the time span between the start of carburization and the time of Cr oxide film formation becomes shorter. The role of Nb is considered to be the retardation of recovery, recrystallization and grain growth through the pinning effect of Nb(CN) during carburizing. The high density of lattice defects introduced by machining is maintained by Nb(CN) and promotes faster Cr diffusion. In the present study, it has been clarified that in machined specimens of Nb-bearing steel, entire coverage of specimen surface by Cr oxide film during carburizing occurs in steels containing even a small amount of Cr like 1%.
机译：在我们以前的论文中，我们报道了渗碳含铌钢中的表面碳浓度（Cs）随着渗碳前加工速度的提高而大大降低。在本研究中，进行了系统的研究以阐明Cr，Nb的添加和加工速度对Cs的影响。在样品表面观察到均匀的氧化铬膜，Cs大大降低。碳浓度曲线的计算是假设在氧化铬膜完全覆盖了样品表面后碳吸收停止了。可以确定的是，本计算与低Cs的测得碳浓度曲线非常吻合。另外，可知，从渗碳开始到形成Cr氧化物膜的时间越短，Cs值越小。 Nb的作用被认为是通过渗碳过程中Nb（CN）的钉扎作用而延迟了恢复，再结晶和晶粒长大的过程。 Nb（CN）保持了通过机加工引入的高晶格缺陷密度，并促进了更快的Cr扩散。在本研究中，已经阐明，在含Nb的机加工试样中，渗碳过程中Cr氧化膜对试样表面的整个覆盖都发生在甚至含有少量Cr（如1％）的钢中。

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  • 来源
    《ISIJ international》 |2015年第1期|227-234|共8页
  • 作者

    Yutaka ETO; Minoru UMEMOTO; Masakatsu YOSHIDA;

  • 作者单位

    Heat Treatment Engineering Department, AISIN AW Co., Ltd., 10 Takane Fujii-cyo Anjo-shi Aichi, 444-1192 Japan;

    Department of Graduate School of Engineering, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku-cho, Toyohashi, Aichi, 441-8580 Japan;

    Department of Graduate School of Engineering, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku-cho, Toyohashi, Aichi, 441-8580 Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Nb-bearing steel; machining; gas carburizing; surface carbon concentration; Cr oxide layer;

    机译：含铌钢加工;气体渗碳;表面碳浓度;氧化铬层;

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