The integration of boronizing and austempering termed boro-austempering treatment is a new processing route for preparing high strength bainitic steel with high surface hardness and high corrosion resistance.The micro...The integration of boronizing and austempering termed boro-austempering treatment is a new processing route for preparing high strength bainitic steel with high surface hardness and high corrosion resistance.The microstructure and properties of a medium-carbon bainitic steel prepared by boro-austempering treatment were characterized and analyzed.The results show that a single Fe_(2)B layer on bainite substrate was obtained with surface hardness of~1400 HV,and the critical load for adhesive failure of borided layer reached 73.6 N.The silicon-rich α-Fe phase in transition zone was clarified as ferrite,which was formed at the beginning stage of cooling process from boronizing to low-temperature bainite transformation.Moreover,the relative potential differences between Fe_(2)B and bainite matrix,and ferrite and bainite matrix were 75 and 92 mV,respectively,with bainite matrix acting as active anode,indicating that the corrosion resistances of Fe2B and ferrite were better than that of bainite.展开更多
基金supported by the National Natural Science Foundation of China(Nos.52274392 and 52104381)Natural Science Foundation of Hubei Province(No.2023AFB023)Knowledge Innovation Program of Wuhan-Basi Research(No.2023010201010133).
文摘The integration of boronizing and austempering termed boro-austempering treatment is a new processing route for preparing high strength bainitic steel with high surface hardness and high corrosion resistance.The microstructure and properties of a medium-carbon bainitic steel prepared by boro-austempering treatment were characterized and analyzed.The results show that a single Fe_(2)B layer on bainite substrate was obtained with surface hardness of~1400 HV,and the critical load for adhesive failure of borided layer reached 73.6 N.The silicon-rich α-Fe phase in transition zone was clarified as ferrite,which was formed at the beginning stage of cooling process from boronizing to low-temperature bainite transformation.Moreover,the relative potential differences between Fe_(2)B and bainite matrix,and ferrite and bainite matrix were 75 and 92 mV,respectively,with bainite matrix acting as active anode,indicating that the corrosion resistances of Fe2B and ferrite were better than that of bainite.
