Grain boundary segregation of minor arsenic and nitrogen at elevated temperatures in a microalloyed steel

Yuan-zhi Zhu 1,2),Zhe Zhu 2),and Jian-ping Xu 1) 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：Auger electron spectroscopy(AES) was used to investigate the grain boundary segregation of arsenic and nitrogen in a kind of microalloyed steel produced by a compact strip production(CSP) technology at 950 to 1100°C,which are similar to the hot working temperature of the steel on a CSP production line.It was discovered that arsenic segregated on grain boundaries when the steel was annealed at 950°C for 2 h.When the annealing temperature increased to 1100°C,arsenic was also found to have segregated on grain boundaries in the early annealing stage,for instance,within the first 5 min annealing time.However,if the holding time of the steel at this temperature increased to 2 h,arsenic diffused away from grain boundaries into the matrix again.Nitrogen was not found to have segregated on grain boundaries when the steel was annealed at a relatively low temperature,such as 950°C.But when the annealing temperature increased to 1100°C,nitrogen was detected to have segregated at grain boundaries in the steel.

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