论文部分内容阅读
为研究吐丝温度对82B高碳钢静态CCT曲线、显微组织及珠光体片层间距的影响,本文采用Gleeble3500热模拟试验机测定了其静态CCT曲线,并分析和讨论了相变区(珠光体+贝氏体)开始温度、开始时间及持续时间的变化原因。结果表明:吐丝温度升高时,CCT曲线向右下方移动,相变开始温度下降,相变开始时间延长,相变持续时间更久,心部马氏体含量增多,珠光体片层间距减小;冷却速率加快时,相变开始时间缩短,相变持续时间呈现先减小后增大再减小的趋势,在冷却速度为3℃/s和6℃/s时,相变的持续时间分别达到最小值(吐丝温度900℃和850℃的持续时间分别为13.2和10.3 s)和最大值(900℃和850℃的持续时间分别为27.3 s和24.8 s),心部马氏体含量增多,珠光体片层间距减小。
In order to study the effect of temperature of silking on static CCT curve, microstructure and pearlite layer spacing of 82B high carbon steel, the static CCT curve was measured by Gleeble 3500 thermal simulation testing machine, and the phase transition zone Body + bainite) start temperature, start time and duration of change reasons. The results show that the CCT curve moves downward to the right, the onset temperature of phase transformation decreases, the transformation start time prolongs, the phase transformation lasts longer, the content of martensite increases and the spacing of pearlite layers decreases When the cooling rate was accelerated, the onset time of phase transformation shortened, and the duration of phase transformation decreased first, then increased and then decreased. At the cooling rate of 3 ℃ / s and 6 ℃ / s, the duration of phase transformation (13.2 and 10.3 s at 900 ℃ and 850 ℃ respectively) and the maximum (27.3 s and 24.8 s at 900 ℃ and 850 ℃, respectively). The martensite content Increased, pearlite sheet spacing decreases.