摘要
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 characteristics of temperature-time of hot forging, hot compression test of the H13 steel was performed on Gleeble-3800 thermal-mechanical simulator at a strain rate of 0.1--10 s ~ and deformation tem- perature of 800--1 100 ℃. The true stress true strain curves were generated. The results show that the sample temperature is raised due to external work in the compression process. Amplitude of temperature rise increases with increase of strain rate. Temperature rise is more meaningful when the deformation temperature is lower. The temperature rise helps to promote the process of dynamic recrystallization softening. Temperature rise leads to dynamic recrystallization more likely to occur when the deformation temperature is lower than 900 ℃ and the strain level is smaller. The peak stress does not increase with increase of the deformation rate, or even slightly decreases, showing a good plasticity. At the same deformation temperature, the grain sizes increase with increase of the temperature rise.
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2017年第9期756-761,共6页
Journal of Iron and Steel Research
关键词
H13钢
热压缩变形
温升
峰值应力
峰值应变
动态再结晶
H13 steel
hot compression
temperature rise
peak stress
peak strain
dynamic recrystallization
