【摘要】 用连续退火模拟机研究了850℃奥氏体化时间(30～100 s)对1 mm厚DP780冷轧双相钢板(%:0.15C、1.80Mn、0.08Ti、0.04Al)组织和力学性能的影响。结果表明,当奥氏体化温度为850℃,以24℃/s冷却至460℃停留12 s,再以7℃/s冷却至室温的情况下,通过改变奥氏体化时间,可改变钢中马氏体含量和钢的抗拉强度。当奥氏体化时间较短时,马氏体呈带状连续分布,当奥氏体化时间较长时,马氏体带状连续性减弱;当奥氏体化时间在30、45、100 s时,该双相钢马氏体含量分别为13.7%、21.6%和15.6%,抗拉强度分别为800、840、805MPa。更多还原

【Abstract】 The effect of austenizing time(30～100 s) at 850℃on structure and mechanical properties of 1 mm sheet of DP780 cold rolled dual phase steel(%:0.15C,1.80Mn,0.08Ti,0.04Al) has been studied by using continuous annealing simulation machine.Results show that with conditions of austenizing at 850℃,cooling to 460℃with 24℃/s,retention for 12 s then cooling to ambient temperature with 7℃/s,the martensite content in steel and tensile strength of steel could be controlled by change austenizing time:with decreasing austenizing time the martensite is continuously banded distribution and with prolonging austenizing time the continuity of banded martensite is weakening;as austenizing for 30,45 and 100 s,the martensite content in the dual phase steel is respectively 13.7%,21.6%and 15.6%,and the tensile strength of steel is respectively 800,840 and 805 MPa.更多还原