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Study on Flow Behavior and Processing Maps of High-Ti Low-C Microalloyed Steel during Hot Compression
Steel Research International ( IF 2.2 ) Pub Date : 2021-05-13 , DOI: 10.1002/srin.202100009
Li-ying Song 1 , Xiu-hua Gao 1 , Ming-ming Wang 1 , Qi-he Xue 2 , R. Devesh Kumar Misra 3 , Jin-bo Li 1 , Hong-yan Wu 1 , Lin-xiu Du 1
Affiliation  

Deformation behavior of a high-Ti low-C microalloyed steel is studied by isothermal compression tests at temperatures of 800–1100 °C and strain rates of 0.1–10 s−1. The results indicate that the lower the strain rate and higher the temperature of steel, the more likely is the dynamic recrystallization. The stress–strain predicted by the constitutive model, which is established based on the experimental data, are in good agreement with the experimental results. It is noted from the processing maps of steel at various strains that there is instability zone which should be avoided during thermal processing at strain rate less than 1 s−1. The range of 850–1100 °C and 5–10 s−1 strain rate is more conducive to the processing of experimental steel. The movement of grain boundaries, subboundaries, and dislocations is hindered by precipitates in steel. In addition, the mean grain size of austenite at 0.1 s−1 is larger than 5 s−1. This is mainly because low strain rate provides more time for growth of grains.

中文翻译:

高钛低碳微合金钢热压缩流动行为及加工图研究

通过等温压缩试验在 800–1100 °C 的温度和 0.1–10 s -1 的应变速率下研究了高钛低碳微合金钢的变形行为。结果表明,应变速率越低,钢的温度越高,动态再结晶的可能性越大。根据实验数据建立的本构模型预测的应力-应变与实验结果吻合良好。从钢在各种应变下的加工图可以看出,在应变速率小于1 s -1 的热处理过程中存在应避免的不稳定区。850–1100 °C 和 5–10 s -1 的范围应变速率更有利于实验钢的加工。钢中的析出物阻碍了晶界、亚晶界和位错的运动。此外,0.1 s -1时奥氏体的平均晶粒尺寸大于5 s -1。这主要是因为低应变率为晶粒的生长提供了更多的时间。
更新日期:2021-05-13
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