20CrMo合金钢热压缩变形流变应力研究
Study on Flow Stress of 20CrMo Alloy Steel Under Hot Compression Deformation
胡美娟, 王 鹏, 李金凤, 韩礼红
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作者单位：(中国石油集团 石油管工程技术研究院, 陕西 西安 710065)
中文关键字：20CrMo合金钢； 热压缩变形； 流变应力； 本构方程； 变形激活能
英文关键字：20CrMo alloy steel; hot compression; flow stress; constitutive equation; deformation activation energy
中文摘要：在Gleeble-3500热模拟试验机上进行了20CrMo合金钢的热压缩试验，研究了材料在高温时流变应力的变化规律。变形温度为900、1000、1100和1200 ℃，应变速度为10、1 和0.1 s-1，变形量为70%。结果表明：20CrMo合金钢的真应力-真应变曲线在变形温度为900 ℃、应变速率为10 s-1的条件下，出现了应力不连续屈服现象。可采用Arrhenius方程描述20CrMo合金钢的高温热变形行为，材料的变形激活能Q为650 kJ/mol。
英文摘要：The hot compression experiment of 20CrMo alloy steel was carried out by Gleeble-3500 thermal-mechanical simulator at the temperature of 900 ℃, 1000 ℃, 1100 ℃ and 1200 ℃, the strain rates of 10 s-1, 1 s-1 and 0.1 s-1 and the compress degree of 70%. The rules of flow stress behavior were studied. The experimental results indicate that there is stress dis-continous yielding phenomenon of the flow stress at the compression temperature of 900 ℃ and the strain rate of 10 s-1. The flow stress of 20CrMo alloy steel during high temperature deformation can be presented by Arrhenius equation, and the hot deformation activation energy (Q) is 650 kJ/mol.