卷取温度对热轧TRIP钢残奥及力学性能的影响

Effect of coiling temperature on retained austenite and mechanical properties of hot rolled TRIP steel

为了研究卷取温度对热轧TRIP钢的残余奥氏体和力学性能的影响,使用金相显微镜、扫描电镜、x-射线衍射、拉伸实验等方法对三种卷取温度下制备的热轧TRIP钢进行分析.结果显示,随着卷取温度的降低,残余奥氏体晶粒尺寸变小,残奥体积分数和碳的质量分数也变小.450℃和400℃卷取温度下制备的热轧TRIP钢的残奥形貌的圆整性相差不大,而350℃卷取温度下制备的热轧TRIP钢的残奥形貌较圆整.热轧TRIP钢的力学性能随着卷取温度的降低表现为高的屈服强度和低伸长率,450℃卷取温度下制备的热轧TRIP钢的综合力学性能最优.

In order to study the effect of coiling temperature on the retained austenite and rrechanical properties of hot rolled transformation-induced plasticity （TRIP） steel, the hot rolled TRIP steel prepared at three dif- ferent coiling temperatures was analyzed with the optical microscope （OM）, scanning electron microscope （SEM）, X-ray diffractometer and tensile tester. The results show that with decreasing the coiling temperature, the grain size of retained austenite decreases, and the volume fraction as well as the carbon content of retained austenite also reduces. The circularity of retained austenite in hot rolled TRIP steel prepared at both 450 ℃ and 400 ℃ has no obvious difference. However, the retained austenite in hot rolled TRIP steel prepared at 350℃ shows better circularity. With decreasing the coiling temperature, the hot rolled TRIP steel exhibits high yield strength and low elongation. The hot rolled TRIP steel prepared at 450℃ possesses the optimum comprehensive mechanical properties.