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Effects of Test Temperature on Low Cycle Fatigue Behaviors in Large Mold Steel
Metals and Materials International ( IF 3.5 ) Pub Date : 2020-05-30 , DOI: 10.1007/s12540-020-00760-3
Jong-Ho Shin , Jehyun Lee

Abstract

A mold steel for plastic injection was subjected to low cycle fatigue (LCF) tests at temperatures of 25, 200, and 250 °C. LCF tests were carried out at a total strain amplitude (Δεt/2) from 0.004 to 0.012 under a constant strain rate of 0.01 s–1. Transmission electron microscope images showed that cyclic loading accelerated dislocation recovery as the LCF test temperature increased. The LCF life increased as a result of improvement in the ductility associated with dislocation recovery as the test temperature increased. The LCF behavior at the test temperature range followed the Coffin–Manson equation. Empirical equation was proposed to predict the LCF life of the mold steel within the test temperature range.

Graphic Abstract

Empirical equation was proposed to predict the LCF life of the mold steel considering the total strain amplitude and test temperature, and the calculated LCF life was in good agreement well with the experimental results.



中文翻译:

试验温度对大型模具钢低周疲劳行为的影响

摘要

注塑用模具钢在25、200和250°C的温度下进行了低循环疲劳(LCF)测试。LCF试验是在一个总应变振幅(进行Δε从0.004 / 2)的0.01 s的恒定应变速率下至0.012 -1。透射电子显微镜图像显示,随着LCF测试温度的升高,循环载荷加速了位错的恢复。随着测试温度的升高,与位错恢复相关的延展性提高,LCF寿命得以延长。在测试温度范围内,LCF行为遵循Coffin-Manson方程。提出了经验公式来预测模具钢在测试温度范围内的LCF寿命。

图形摘要

提出了基于总应变幅值和试验温度的经验公式来预测模具钢的LCF寿命,计算得出的LCF寿命与实验结果吻合良好。

更新日期:2020-05-30
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