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采用Gleeble-3800热模拟试验机、金相显微镜、透射电子显微镜等,研究了低温建筑用高强度低合金钢在850～1 200℃以5 s-1的应变速率热压缩变形的行为,建立了低合金钢的热压缩变形本构方程。结果表明:热轧态低合金钢的组织为铁素体+珠光体,热变形后转变为奥氏体+再结晶晶粒。在变形温度为850～1 100℃时,温度越高,再结晶晶粒越细小、数量越多;而变形温度为1 100～1 200℃时,温度越高,再结晶晶粒越粗大、数量越少。低合金钢的热变形本构方程为Z=5exp(342 080/RT)=7.808 4×10-3σp7.975 1,在850～1 200℃范围内,峰值应力σp的计算结果与试验结果的误差小于10%。随着变形温度的升高,V(C,N)相的数量减少、尺寸增大,不同温度变形的低合金钢中V(C,N)相的再结晶驱动力FR都大于其对晶界/亚晶界和位错的钉扎力Fp,这表明V(C,N)相能有效延缓低合金钢中动态再结晶的发生。
Abstract：Behavior of hot-compression deformation at temperature of 850 to 1 200 ℃ and at strain rate of 5 s-1 for high-strength low-alloy steel for low-temperature building was investigated by using Gleeble-3800 thermal simulation testing machine, metallographic microscope, transmission electron microscope and so on,and the constitutive equation of hot-compression deformation of the low-alloy steel was established.The results showed that the microstructure of the hot-rolled low-alloy steel was ferrite and pearlite,which transformed into austenite and recrystallized grain after hot deformation.The higher the deformation temperature ranging from 850 to 1 100 ℃,the finer and more the recrystallized grains were.The higher the deformation temperature ranging from 1 100 to 1 200 ℃,the larger and less the recrystallized grains were.The hot deformation constitutive equation of the low-alloy steel was expressed as: Z = 5exp(342 080/RT) = 7.808 4 × 10-3σp7.975 1,and the error between the calculated and measured results of peak stress σp was less than 10% in the temperature range of 850 to 1 200 ℃． With the increase in deformation temperature,V(C,N) phase decreased in amount and increased in size,and its recrystallization driving force FR at different deformation temperatures was greater than force Fp of its locking grain-boundary/subgrain boundaries and dislocations,which indicated that V(C,N) phase can effectively delay the occurrence of dynamic recrystallization in the low-alloy steel.
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基本信息:
DOI：10.19947/j.issn.1001-7208.2022.01.006
中图分类号:TG142.33;TU511.3
引用信息:
[1]刘宏霞,宋源,秦世宇,等.低温建筑用高强度低合金钢的高温变形行为[J].上海金属,2022,44(01):28-34.DOI:10.19947/j.issn.1001-7208.2022.01.006.
基金信息:
吉林省重点科技计划(No.2018YFB0307)
2022-01-18
2022-01-18