X65管线钢的高温热变形行为研究
Study on Hot Deformation Behavior of X65 Pipeline Steel
肖 岚, 蔡大勇, 史东日, 廖 波
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作者单位：燕山大学 亚稳材料制备技术与科学国家重点实验室, 河北 秦皇岛 066004
中文关键字：X65管线钢； 热变形； 激活能
英文关键字：X65 pipeline steel; hot deformation; activation energy
中文摘要：采用Gleeble-3500热模拟试验机研究了X65管线钢的高温热变形行为。结果表明，X65管线钢在给定的试验条件下，随着变形温度降低及应变速率增加，流变应力增加，同时峰值应变增加；实验钢的热变形激活能为276.9 kJ/mol，建立了X65管线钢的热变形方程，确立了峰值应力σp与Zener-Hollomon因子的关系。
英文摘要：The hot deformation behavior of X65 pipeline steel was simulated by Gleeble-3500 thermal/mechanical simulation tester. The results show that the flow stress and peak strain increase with the decrease of temperature and the increase of strain rate. The apparent activation energy of the steel is about 276.9 kJ/mol. Hot deformation equation is given to characterize the dependence of peak stress on temperature and strain. It is found that the peak stress bears the linear relationship with Z parameter.