40Mn2V非调质钢热变形再结晶的研究

A Study on Recrystallization of Non-Quenched-Tempered Steel 40Mn2V during Thermal Deformation

采用Gleeble-1500热模拟机测得40Mn2V微合金化非调质钢(%:0.38C、1.48Mn、0.12V)Φ90 mm管坯在800～1 000℃、变形速率0.5～2.0 s^(-1)时的真应力-应变曲线,并研究了该钢的动态再结晶行为。结果表明,40Mn2V钢的动态再结晶激活能Q_d为382.21 kJ/mol,通过动态再结晶图得出,因子Z>2.621×10^(15)时,40Mn2V钢动态再结晶难以完成,当因子Z>2.014×10^(17)时,该钢动态再结晶难以发生。

True stress-strain curves of Ф90 mm tube blank of microalloying non-quenched-tempered steel 40Mn2V （ % ： 0. 38C, 1.48Mn, 0. 12V） with deformation rate 0. 5 - 2.0 s^-1 at800 - 1 000 ℃ have been measured by Gleeble- 1500 thermal simulator to study the dynamic recrystallization behavior of the steel. Results show that the dynamic recrystallization activation energy Qd of steel 40Mn2V is 382.21 kJ/mol; it is obtained by dynamic recrystallization figure that it is difficult to complete the dynamic recrystallization of steel 40Mn2V as factor Z 〉 2. 621 ×10^15 , and occurrence of the dynamic recrystallization of steel is difficult as factor Z 〉 2. 014×10^17.