21-4N气门钢高温压缩变形行为
The high temperature compression behavior of 21-4N valve steel in hot-working process
郑淼焱，章争荣，宋玲利，莫东强
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作者单位：1.广东工业大学 材料与能源学院 广东 广州 510006；2.广东怀集汽车配件厂，广东 怀集 526400
中文关键字：21-4N气门钢；高温压缩变形；流变应力；本构方程
英文关键字：21-4N valve steel; hot compression deformation; flow stress; constitutive equation
中文摘要：采用圆柱试样在Gleeble-1500D热模拟试验机上进行高温压缩变形模拟实验，变形温度范围为800-1100℃，应变速率范围为0.005 -1 s-1，研究了5Cr21Mn9Ni4N（21-4N）气门钢的高温塑性变形行为。实验结果表明，21-4N气门钢高温压缩变形时，应变速率和变形温度的变化强烈影响合金的流动应力，流动应力随变形速率的提高而增大； 随变形温度的提高而降低。高温变形条件下流动应力σ、应变速率 和变形温度T之间满足以下关系式：ε =1.008×1018[sinh(0.0053σ)]6.1945exp(-464127/RT)。该实验数据可为电镦工艺参数优化和数值模拟提供必要的依据。
英文摘要：The high temperature flow behavior of 5Cr21Mn9Ni4N（21-4N）Valve steel was investigated by isothermal compression testing of cylindrical specimens with Gleeble-1500D thermal simulation testing machine. The results show that the flow stress of 21-4N steel is controlled by strain rate and deformation temperature: the flow stress increases with the decreases of deformation temperature and the increase of strain rate. The flow stress equation during high temperature compression can be represented by a formula：ε =1.008×1018[sinh(0.0053σ)]6.1945exp(-464127/RT)。The experimental data can provide the necessary basis for the optimization of process parameters and numerical simulation.