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以含Al热轧双相钢为研究对象,在箱式电阻炉上研究了不同加热温度对热轧双相钢中第二相粒子回溶行为的影响。通过显微组织观察可以发现,含Al热轧双相钢呈现明显的双相特征,组织为铁素体和少量马氏体。随着加热温度的升高,奥氏体晶粒晶粒尺寸逐渐增大,当温度在1150℃以上时,奥氏体晶粒开始异常长大,即本试验钢的晶粒粗化温度。随着加热温度的升高,第二相粒子发生回溶,尺寸明显减小且析出减小。尺寸大的粒子,含Al量多,尺寸小的粒子,含Al量少,其成分为AlN。
Taking Al hot-rolled dual-phase steel as the research object, the effect of different heating temperature on the second-phase particle remelting behavior in hot-rolled dual-phase steel was studied on a box-type resistance furnace. Through the microstructure observation, it can be found that the Al-containing hot-rolled dual phase steel exhibits obvious biphasic characteristics with ferrite and a small amount of martensite. With the increase of heating temperature, the grain size of austenite grains gradually increases. When the temperature is above 1150 ℃, austenite grains begin to grow abnormally, that is, the grain coarsening temperature of the test steel. With the increase of the heating temperature, the second-phase particles are back-dissolved, the size is obviously reduced and the precipitation is reduced. Large size of the particles, the amount of Al, small size particles, Al content less, the composition of AlN.