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›› 2013, Vol. 13 ›› Issue (1): 17-22.

• 流动与传递 • 上一篇    下一篇

SCM435钢贝氏体中碳原子的扩散行为

徐东 祭程 唐正友 朱苗勇   

  1. 东北大学材料与冶金学院 东北大学材料与冶金学院 东北大学材料与冶金学院 东北大学材料与冶金学院
  • 收稿日期:2013-03-06 修回日期:1900-01-01 出版日期:2013-02-20 发布日期:2013-02-20
  • 通讯作者: 朱苗勇

Diffusion Behavior of Carbon Atoms in Bainite of SCM435 Steel

XU Dong JI Cheng TANG Zheng-you ZHU Miao-yong   

  1. School of Materials and Metallurgy, Northeastern University School of Materials and Metallurgy, Northeastern University School of Materials and Metallurgy, Northeastern University School of Materials and Metallurgy, Northeastern University
  • Received:2013-03-06 Revised:1900-01-01 Online:2013-02-20 Published:2013-02-20
  • Contact: ZHU Miao-yong

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摘要： 为描述贝氏体中碳原子的扩散行为，建立了SCM435钢二维扩散数学模型，并根据实测结果计算出SCM435钢的扩散系数及扩散激活能，在此基础上，依次获得不同边界条件下的碳扩散. 结果表明，在贝氏体区，从750℃下降到650℃时，SCM435钢中碳原子扩散行为急剧减少，激活能为407 kJ/mol；750℃冷却时，冷速从0.2℃/s升到1℃/s，其脱碳层厚度由29降到12.5 mm；对于已有100 mm的脱碳层，渗碳气氛碳含量由0.35%升到1%，消除金相下的脱碳层的时间由21.5降到8.5 min，但随着时间延长，其与SCM435钢基体标准碳含量的差值逐步变大.

关键词: SCM435钢, 扩散行为, 数学模型, 脱碳层, 激活能

Abstract: In order to describe carbon atoms of diffusion behavior of bainite, two-dimensional diffusion mathematical model of SCM435 steel was established, and diffusion coefficient and activation energy of SCM435 steel were calculated based on the measured results. On this basis, the carbon diffusion behavior under different boundary conditions was sequentially obtained. The results showed that when temperature fell from 750 to 650℃ in bainite, diffusion behavior of carbon atoms of SCM435 steel was sharply reduced, and activation energy was about 407 kJ/mol. When cooling rate rised from 0.2 to 1℃/s from 750℃, the thickness of decarburization layer fell from 29 to 12.5 μm. When carbon content of carburizing atmosphere rised from 0.35% to 1 % as it had 100 μm decarburized layer, time fell from 21.5 to 8.5 min in order to eliminate the decarburization layer of metallographic sample, but its differential with the base of the carbon content of SCM435 steel gradually became higher along with more time.

Key words: SCM435 steel, diffusion behavior, mathematical model, decarburized layer, activation energy

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