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根据热锻工艺温度-时间特征,利用Gleeble-3800热模拟试验机对H13钢进行高温压缩试验,在变形温度为800~1 100℃,变形速率为0.1~10s-1条件下获得真应力-真应变曲线。试验结果表明:压缩过程中,外力做功会导致样品温度升高,温升幅度随变形速率的增加而增大,在较低温度下变形时温升更为显著,这部分温升有利于促进动态再结晶的软化过程。由此导致900℃以下变形的试样在更小应变下就可发生再结晶,其峰值应力不会随变形速率升高而增大,甚至略微降低,呈现出较好塑性。相同变形温度下,变形后的晶粒尺寸随温升幅度的增加而增大。
According to the temperature-time characteristics of the hot forging process, the high-temperature compression test of the H13 steel was carried out by using a Gleeble-3800 thermal simulation testing machine. The true stress was obtained under the conditions of a deformation temperature of 800-1 100 ° C and a deformation rate of 0.1-10s-1 Strain curve. The experimental results show that during the compression process, the external force causes the sample temperature to increase, the temperature increase amplitude increases with the increase of the deformation rate, and the temperature rise is more significant when the deformation occurs at lower temperature. This part of temperature rise is helpful to promote the dynamic Recrystallization softening process. As a result, the sample deformed below 900 ℃ could be recrystallized under a smaller strain, and the peak stress did not increase with the increase of deformation rate, and even decreased slightly, showing good ductility. The same deformation temperature, the deformation of the grain size increases with increasing temperature range.