Mo-Ti微合化热轧高强钢的组织与性能
发布时间：2018-11-28 08:10
【摘要】：对一种Mo-Ti微合金钢进行了热轧实验,研究了不同工艺条件下的组织特征、析出行为及低温冲击性能。结果表明,随着终轧温度及终冷温度的降低,实验钢的屈服强度和抗拉强度均有所升高;当终轧温度较高时,细小的析出物主要在冷却及模拟卷取过程中产生,当终轧温度较低时,细小的析出物主要由应变诱导析出及冷却、模拟卷取过程的析出物组成;实验钢的组织以铁素体为主,随着终轧温度及终冷温度的降低,晶粒尺寸明显细化,同时,组织中渗碳体及钛的碳化物等岛状物的尺寸也变小,大角度晶界比例增加,低温冲击裂纹由脆性断裂变为韧性断裂;当终轧温度为800~810℃,终冷温度分别为615℃和500℃时,实验钢的屈服强度分别为738 MPa及768 MPa,抗拉强度分别为857 MPa和872 MPa,伸长率为18%~19%,其韧脆转变温度低于-70℃,实验钢具有良好的强度及韧性指标。
[Abstract]:The hot rolling experiments of a Mo-Ti microalloyed steel were carried out. The microstructure, precipitation behavior and impact properties at low temperature were studied under different processing conditions. The results show that the yield strength and tensile strength of the experimental steel increase with the decrease of the final rolling temperature and the final cooling temperature. When the final rolling temperature is high, the fine precipitates are mainly produced in the process of cooling and simulated coiling, and when the final rolling temperature is low, the fine precipitates are mainly composed of strain-induced precipitation and cooling, and the precipitates in the simulated coiling process are composed of the precipitates. The microstructure of the experimental steel is mainly ferrite. With the decrease of the final rolling temperature and the final cooling temperature, the grain size is obviously refined. At the same time, the size of the cementite and titanium carbides in the microstructure also becomes smaller, and the ratio of large angle grain boundary increases. The low temperature impact crack changed from brittle fracture to ductile fracture. When the final rolling temperature is 800 鈩，
本文编号：2362308
[Abstract]:The hot rolling experiments of a Mo-Ti microalloyed steel were carried out. The microstructure, precipitation behavior and impact properties at low temperature were studied under different processing conditions. The results show that the yield strength and tensile strength of the experimental steel increase with the decrease of the final rolling temperature and the final cooling temperature. When the final rolling temperature is high, the fine precipitates are mainly produced in the process of cooling and simulated coiling, and when the final rolling temperature is low, the fine precipitates are mainly composed of strain-induced precipitation and cooling, and the precipitates in the simulated coiling process are composed of the precipitates. The microstructure of the experimental steel is mainly ferrite. With the decrease of the final rolling temperature and the final cooling temperature, the grain size is obviously refined. At the same time, the size of the cementite and titanium carbides in the microstructure also becomes smaller, and the ratio of large angle grain boundary increases. The low temperature impact crack changed from brittle fracture to ductile fracture. When the final rolling temperature is 800 鈩，
本文编号：2362308
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