| X12CrMoWVNbN钢的热变形行为及热加工图 |
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| 引用本文： | 李荣斌,李博,张志玺,彭望君,郭彦兵.X12CrMoWVNbN钢的热变形行为及热加工图[J].金属热处理,2022,47(5):31-39. |
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| 作者姓名： | 李荣斌 李博 张志玺 彭望君 郭彦兵 |
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| 作者单位： | 1.上海理工大学 材料与化学学院, 上海 200093; 2.上海电机学院 材料学院, 上海 201306; 3.上海电机学院 上海大件热制造工程技术研究中心, 上海 201306 |
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| 基金项目： | 上海市地方院校能力建设项目(21010500900);上海大件热制造工程技术研究中心(18DZ2253400) |
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| 摘 要： | 利用Gleeble3180热模拟试验机,在变形温度为950~1100 ℃,应变速率为0.001~1 s-1,真应变为0.7的条件下,对X12CrMoWVNbN钢进行了高温单向热压缩试验。通过不同条件下的高温流变曲线分析了变形温度和应变速率对试验钢热变形力学行为的影响。以Arrhenius方程为本构模型,建立了能够预测该钢流动应力的本构方程。基于动态材料模型和试验参数、结果,绘制了该钢不同应变量下的热加工图并结合图进行了组织分析。结果表明,流变峰值应力和稳态应力随温度降低或应变速率升高而升高;功率耗散系数随应变速率降低和变形温度的升高而增大;最优热加工区域功率耗散系数η的值都在0.4以上,且这些区域的变形组织晶粒均匀细小;0.3、0.4、0.5和0.6应变下的最优热加工区域都处于变形温度1050~1100 ℃、应变速率0.001~0.003 s-1的范围。
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| 关 键 词： | X12CrMoWVNbN钢 热压缩 本构方程 热加工图 热变形组织 |
| 收稿时间： | 2022-02-05 |
Hot deformation behavior and processing maps of X12CrMoWVNbN steel |
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| Li Rongbin,Li Bo,Zhang Zhixi,Peng Wangjun,Guo Yanbing.Hot deformation behavior and processing maps of X12CrMoWVNbN steel[J].Heat Treatment of Metals,2022,47(5):31-39. |
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| Authors: | Li Rongbin Li Bo Zhang Zhixi Peng Wangjun Guo Yanbing |
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| Affiliation: | 1. School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, China; 2. School of Materials Science and Engineering, Shanghai Dianji University, Shanghai 201306, China; 3. Shanghai Engineering Research Center of Large Piece Hot Manufacturing, Shanghai Dianji University, Shanghai 201306, China |
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| Abstract: | Using Gleeble3180 thermal simulation testing machine, under the conditions of temperature between 950-1100 ℃, strain rate between 0.001-1 s-1, and true strain 0.7, high temperature unidirectional thermal compression experiments were carried out on X12CrMoWVNbN steel. The effects of temperature and strain rate on mechanical behavior of the tested steel during hot deformation were analyzed by high temperature flow curves under different conditions. Based on the Arrhenius equation as the constitutive model, a constitutive equation that can predict the flow stress of the steel was established. Based on the dynamic material model, experimental parameters and results, the processing maps of the steel under different strains were drawn, and the microstructure analysis was carried out combined with the maps. The results show that the flow peak stress and steady state stress increase with the decrease of temperature and increase of strain rate, the power dissipation coefficient increases with the decrease of strain rate and the increase of deformation temperature, the values of the power dissipation coefficient η in the optimal hot working areas are all above 0.4, and the deformed microstructure in these areas is uniform and fine. The optimal hot working regions at strain of 0.3, 0.4, 0.5 and 0.6 are all in the range of deformation temperature of 1050-1100 ℃ and strain rate of 0.001-0.003 s-1. |
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| Keywords: | X12CrMoWVNbN steel hot compression constitutive equation hot processing map hot deformed microstructure |
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