郑志超,张利,刘承志,等.817炮钢的热变形行为及热加工图[J].精密成形工程,2025,17(1):107-116.
ZHENG Zhichao,ZHANG Li,LIU Chengzhi,et al.Hot Deformation Behavior and Hot Working Diagram of 817 Gun Steel[J].Journal of Netshape Forming Engineering,2025,17(1):107-116. |
| 817炮钢的热变形行为及热加工图 |
| Hot Deformation Behavior and Hot Working Diagram of 817 Gun Steel |
| 投稿时间：2024-04-19 |
| DOI：10.3969/j.issn.1674-6457.2025.01.013 |
| 中文关键词: 817炮钢 热压缩 流变行为 本构模型 热加工图 |
| 英文关键词: 817 gun steel heat compression rheological behavior constitutive model hot working diagram |
| 基金项目:山西省基础研究计划(202203021212117);山西省高等学校科技创新项目(2020L0311，2020L0320);中国科协“青年人才托举工程”计划(2023QNRC001) |
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| 中文摘要: |
| 目的 研究817炮钢的热变形行为，优化工艺参数并获得最佳热变形区间。方法 通过Gleeble热压缩模拟试验机对817炮钢在变形温度850~1 150 ℃、应变速率0.01~10 s−1条件下进行热压缩试验，通过试验数据点绘制不同参数区间的热变形流变应力曲线，结合传统热变形本构模型，建立了耦合应变量的高温流变本构模型;利用动态材料模型(DMM)及Prasad塑性失稳判据，分别计算出了该炮钢的能量耗散因子和非稳定因子，获得了817炮钢的热加工图。结果 817炮钢的热变形流变应力曲线展现出典型的动态再结晶特征，塑性变形应力随着变形温度的升高和应变速率的降低而降低;由改进后的高温流变本构模型计算的预测值与试验值的相关系数高达0.991 2，表明该模型能够准确描述817炮钢在热加工过程中的流变行为。结论 由热加工图可知，817炮钢在低的变形温度和高的应变速率下可能会失稳，观察高能量耗散区内的金相组织发现再结晶特征明显，在高温低应变速率下发生再结晶行为。最终获得817炮钢的最佳热变形区间为温度1 000~1 100 ℃、应变速率0.01~0.14 s−1。 |
| 英文摘要: |
| The work aims to study the heat distortion behaviour of 817 gun steel, optimize the process parameters and obtain the best heat distortion interval. The hot compression test of 817 gun steel was carried out by Gleeble hot compression simulation machine at 850-1 150 ℃ and strain rates of 0.01-10 s−1. The thermal deformation rheological stress curves of different parameter intervals were plotted through the experimental data points. And the high-temperature rheological ontological model with coupled strain variables was established by combining with the traditional thermal deformation ontological model. The dynamic material model (DMM) and Prasad plastic instability criterion were used to calculate the energy dissipation factor and instability factor of the gun steel to obtain the thermal working diagram of 817 gun steel. Results showed that the flow stress curve of 817 gun steel exhibited typical dynamic recrystallization characteristics, and the plastic deformation stress of 817 gun steel decreased with the increase of deformation temperature and the decrease of strain rate. The correlation coefficient between the predicted value and the experimental value reached 0.991 2, reflecting that the model could describe the rheological behavior of 817 gun steel during hot working. After establishing the thermal processing map, it is found that the 817 gun steel may be destabilized at low deformation temperatures and high strain rates, and the recrystallization features are found to be obvious through the metallographic organization within the high energy dissipation region. The recrystallization behavior occurs at high temperature and low strain rate. The optimum thermal deformation interval of 817 gun steel is finally concluded as follows:temperatures of 1 000-1 100 ℃ and strain rates of 0.01-0.14 s−1. |
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