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| Effect of Cu on continuous cooling transformation of medium carbon Si-Mn steel |
| AN Zhi-guo1，MENG Yan-jun2， SHI Yuan1， LI Jian-chao2， SUN Xiao-ran1， SUN Yan1 |
（1. Technology Research Institute， Hesteel Group， Shijiazhuang 050023， Hebei， China
2. Department of Materials Engineering， Hebei College of Industry and Technology， Shijiazhuang 050091， Hebei， China） |
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Abstract In order to understand phase transformation of Cu-containing medium carbon Si-Mn steel，the effect of Cu on microstructures and micro-hardness of medium carbon Si-Mn steel at different cooling rates were investigated by a DIL805L thermal dilatometer. The Cu-rich precipitates were analyzed by high resolution transmission electron microscope. The results show that Cu could prolong bainite ncubation period， reduce bainite and martensite starting transformation temperature. During continuous cooling transformation，The Cu-rich particles dispersive precipitate in the ferrite and refine ferrite grain. The micro-hardness of copper bearing medium carbon Si-Mn steel increased with the cooling rate increase when the cooling rate was lower than 21 ℃/s. The content of Cu-rich particles increased with the increase of cooling rate，meanwhile the bainite and martensite also increased. Instead，Cu can lower the micro-hardness of bainite and martensite in the steel when the cooling rate was higher than 21 ℃/s.
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Received: 05 June 2017
Published: 21 December 2017
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2017, Vol. 52 
