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利用Gleeble-3500热-力学模拟试验机测定应力作用下X100管线钢热影响区的相转变温度,并结合金相显微组织观察及显微硬度分析,绘制出X100管线钢的SH-CCT曲线。结果表明:随着冷却速率的增加,相变产物由铁素体逐步转变为贝氏体和马氏体,硬度呈上升趋势。与应力作用时相比,应力作用下各相的开始相变点均有所提高;应力作用使相变所得的显微组织比未施加应力时的更细小,硬度也更高。
The phase transition temperature of heat-affected zone of X100 pipeline steel under stress was measured by Gleeble-3500 thermo-mechanical simulation test machine. The SH-CCT curve of X100 pipeline steel was drawn by metallographic microstructure observation and microhardness analysis. The results show that as the cooling rate increases, the phase transformation products gradually change from ferrite to bainite and martensite, and the hardness increases. Compared with the stress, the initial phase transition point of each phase is increased under the action of stress. The microstructure of the phase transformation is smaller and the hardness is higher than the stress without stress.