合金元素Mo对冷轧双相钢组织的影响

分析Mo微合金冷轧双相钢和普通C-Mn冷轧双相钢在不同双相热处理工艺下微观结构，讨论Mo对冷轧双相钢组织变化规律的影响。实验结果表明：当两种双相钢以1700℃／s冷却时，均获得了铁素体、马氏体双相组织，马氏体均匀分布在铁素体基体上，随着加热温度的升高，普通C-Mn双相钢得到的马氏体体积分数多。当以5．4℃／s冷却时，Mo微合金双相钢得到的马氏体体积分数多；当加热到820℃保温结束后以5．4℃／s的速率冷却时，普通C-Mn钢的组织组成相为铁素体、珠光体、马氏体；Mo微合金钢的组织组成相为铁素体、贝氏体、马氏体；Mo对铁素体晶粒的细化作用不明显。

Influence of Mo on Cold Rolled Dual Phase Steel Microstructure

Analyze microstructures of Mo alloyed cold roiled dual phase steel and conventional microalloyed C-Mn cold rolled dual phase steel at different conditions of heat treatment. The influence of Mo on the cold rolled dual phase steel microstructures is discussed by the means of the observation. The results show that When cooling rate is 1700℃/s, the microstructures comprise ferrite and martensite, and martensite islands are surrounded by the ferrite matrix. As the heating temperature increases, the martensite volume fraction of C-Mn steels is more. However, when cooling rate is 5.4℃/s, the result is opposite. While the heat treatment temperature reaches 820℃ and the samples are cooled to the room temperature at a cooling rate of 5.4℃/s, the microstructure of C-Mn steel is composed of ferrite, martensite, pearlite and martensite, as to the Mo microalloyed steel, the microstructure is composed of ferrite, bainite and martensite. The effect of Mo on the ferrite grain refining is not obvious.