A method to study interface diffusion of arsenic into a Nb-Ti microalloyed low carbon steel

Yuan-zhi Zhu 1,2) and Jian-ping Xu 2) 1) The Key Laboratory of the Ministry of Education of China for Ferrous Metallurgy and Resources Utilization, Wuhan University of Science and Technology, Wuhan 430081, China 2) School of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China

摘 要：A novel diffusion couple method was used to investigate the interface diffusion of arsenic into a Nb-Ti microalloyed low carbon steel and its effects on phase transformation at the interface. It is discovered that the content of arsenic has great effect on grain growth and phase transformation at high temperature. When the arsenic content is no more than 1wt%, there is no obvious grain growth and no obvious ferrite transitional region formed at the diffusion interface. However, when the arsenic content is no less than 5wt%, the grain grows very rapidly. In addition, the arsenic-enriched ferrite transitional layer forms at the diffusion interface in the hot-rolling process, which results from a slower diffusion rate of arsenic atoms than that of carbon in ferrite.

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