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The phase transformation characteristics of a high-strength TRIP-aided multiphase cold-rolled steel during continuous heating at different cooling rates were studied by means of dilatometry,and the critical temperatures were also determined.The samples were fully austenitized at 1 050 ℃ and then cooled at different cooling rates ranging from0.5 ℃/s to 100 ℃/s.The continuous cooling transformation(CCT)curves were obtained for the experimental steel.The experimental results showed that a high cooling rate depressed the formation of ferrite and pearlite and promoted the formation of bainite and martensite,leading to a higher hardness.A large amount of martensite in high-strength TRIP-aided multiphase cold-rolled steel can be obtained at cooling rates in excess of 50 ℃/s.The experimental results provide guidelines for cooling control and heat treatment in real steel production.
The phase transformation characteristics of a high-strength TRIP-aided multiphase cold-rolled steel during continuous heating at different cooling rates were studied by means of dilatometry, and the critical temperatures were also determined. Samples were fully austenitized at 1 050 ° C and then cooled at different cooling rates ranging from 0.5 ° C / s to 100 ° C / s. The continuous cooling transformation (CCT) curves were obtained for the experimental steel. the experimental results showed that a high cooling rate depressed the formation of ferrite and pearlite and promoted the formation of bainite and martensite, leading to a higher hardness. A large amount of martensite in high-strength TRIP-aided multiphase cold-rolled steel can be obtained at cooling rates in excess of 50 ° C / s. for cooling control and heat treatment in real steel production.