钛微合金化IF钢第二相粒子应变诱导析出行为
发布时间：2018-11-11 22:06
【摘要】：在Gleeble-3500热模拟试验机上,利用应力松弛试验研究了钛微合金化IF钢奥氏体区第二相粒子析出行为。试验结果表明:因第二相粒子析出钉轧位错与晶界,应力松弛曲线呈现出3个阶段的特征。试验钢的析出-时间-温度曲线呈现出典型的"C"曲线形状,最快析出鼻子点温度约为900℃,在此温度下,第二相粒子析出开始时间与结束时间分别为10与160 s;随着等温弛豫时间的延长,第二相粒子析出数量逐渐增加,当弛豫时间超过析出结束时间后,析出物数量将不再增加而尺寸增加。试验用Ti-IF钢主要观察到Ti N、Ti4C2S2、Ti C 3种析出物,Ti4C2S2与Ti C沉淀物的形状和尺寸相差不多,无法从形状和大小上来区分,易于沿奥氏体晶界或亚晶界析出,奥氏体亚晶的尺寸大约分布在0.1~0.4μm。900℃应变诱导析出物数量较800℃多,该结果与试验钢PPT曲线析出鼻子点温度900℃是相符的。对于Ti-IF钢,其热轧工艺过程应有利于C,N化物的析出和聚集长大,最终形成粗大、稀疏的第二相粒子,因此宜采用"三低一高"快速大压下的热轧工艺制度,以提高Ti-IF钢的深冲性能。
[Abstract]:The precipitation behavior of the second phase particles in the austenitic zone of titanium microalloyed IF steel was studied by stress relaxation test on Gleeble-3500 thermal simulator. The experimental results show that the stress relaxation curve shows three stages because of the pinning dislocation and grain boundary of the second phase particles. The precipitation-time-temperature curve of the test steel shows the typical "C" curve shape, the fastest precipitating nose point temperature is about 900 鈩，
本文编号：2326272
[Abstract]:The precipitation behavior of the second phase particles in the austenitic zone of titanium microalloyed IF steel was studied by stress relaxation test on Gleeble-3500 thermal simulator. The experimental results show that the stress relaxation curve shows three stages because of the pinning dislocation and grain boundary of the second phase particles. The precipitation-time-temperature curve of the test steel shows the typical "C" curve shape, the fastest precipitating nose point temperature is about 900 鈩，
本文编号：2326272
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