High‐Temperature Tensile Properties and Deformation Behavior of Three As‐Cast High‐Manganese Steels,Steel Research International

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High‐Temperature Tensile Properties and Deformation Behavior of Three As‐Cast High‐Manganese Steels
Steel Research International ( IF 1.9 ) Pub Date : 2020-08-26 , DOI: 10.1002/srin.202000313
Yaozu Shen ₁ , Jianhua Liu ₁ , Hao Xu ₁ , Hongbo Liu ₂

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Herein, the high‐temperature tensile properties and deformation behavior of three as‐cast high‐manganese steels with various carbon contents (0.028, 0.28, and 0.64 wt%) are investigated using a combination of hot tensile tests and isothermal hot compression on a Gleeble‐3500 thermomechanical simulator with different temperatures and strain rates. The results indicate that the carbon content increase makes a greater number of Mn–C dipoles available for a short‐range ordering and increases in the peak stress and the maximum flow stress at a constant test temperature and strain rate. In contrast, the stress decreases with increasing test temperatures. The change in carbon content affects the phase transformation at high temperatures, leading to differences in hot ductility. Steels with a carbon content of 0.028 and 0.28 wt% have similar hot brittle temperature ranges, whereas the ductility of the steel improves with increasing temperatures when the carbon content increases to 0.64 wt%. For the hot compression test, the influence of strain rates in increasing the maximum stress grows with increasing carbon content. The hot deformation activation energies of different steels are confirmed, with which the peak stresses could be predicted by the Z parameter in the hyperbolic sine equation. A good correlation is obtained between model predictions and experimental observations in the peak stress.

中文翻译：

三种铸态高锰钢的高温拉伸性能和变形行为

在此，结合热拉伸试验和等温热压缩，在Gleeble上研究了三种含碳量分别为0.028、0.28和0.64 wt％的铸态高锰钢的高温拉伸性能和变形行为。 ‐3500具有不同温度和应变率的热机械模拟器。结果表明，碳含量的增加使得短程有序的Mn-C偶极子数量增加，并且在恒定的测试温度和应变速率下，峰值应力和最大流应力增加。相反，应力随着测试温度的升高而降低。碳含量的变化会影响高温下的相变，从而导致热延展性差异。碳含量为0.028和0的钢。28 wt％具有相似的热脆温度范围，而当碳含量增加到0.64 wt％时，钢的延展性随温度升高而提高。对于热压缩测试，应变率对增加最大应力的影响随碳含量的增加而增加。确定了不同钢种的热变形活化能，利用双曲正弦方程中的Z参数可以预测峰值应力。在模型预测和峰值应力的实验观察之间获得了良好的相关性。确定了不同钢种的热变形活化能，利用双曲正弦方程中的Z参数可以预测峰值应力。在模型预测和峰值应力的实验观察之间获得了良好的相关性。确定了不同钢的热形变活化能，利用双曲正弦方程中的Z参数可以预测峰值应力。在模型预测和峰值应力的实验观察之间获得了良好的相关性。

更新日期：2020-08-26

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