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首页> 外文期刊>Materials Science and Technology: MST: A publication of the Institute of Metals >Plastic properties and constitutive equations of 42CrMo steel during warm forming process
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Plastic properties and constitutive equations of 42CrMo steel during warm forming process

机译：42CrMo钢热成形过程中的塑性和本构方程

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摘要

In order to obtain the practical warm forming process parameters of 42CrMo steel in manufacturing, the plastic properties and constitutive equations of 42CrMo steel during the warm forming process are investigated through the isothermal compression tests. The results show that the true stress of 42CrMo steel increases as the forming temperature decreases and the strain rate increases; the strain rate sensitivity increases as the forming temperature increases, but decreases when the forming temperature is >750℃; the maximum strain rate sensitivity exponent 0.0988 appears at 700℃ and the true strain of 0.65; the temperature sensitivity decreases as the strain rate and true strain increase; the strain hardening exponent decreases slowly as the true strain increases under the strain rates of 0.01, 0.1 and 1 s~(-1), but it decreases sharply under the strain rate of 10 s~(-1), especially the strain hardening exponent increases when the true strain is >0.55 under 750℃ and the strain rate is 0.01s~(-1). Furthermore, the developed constitutive equations represented by a Zener-Hollomon parameter could give a precise estimate (correlation coefficient: R=O.99) for the plastic flow behaviour of 42CrMo steel during the warm forming process.
机译：为了获得42CrMo钢在制造过程中实用的热成形工艺参数，通过等温压缩试验研究了42CrMo钢在热成形过程中的塑性和本构方程。结果表明，随着成形温度的降低和应变率的增加，42CrMo钢的真实应力增加。应变速率灵敏度随着成形温度的升高而增加，而在成形温度> 750℃时降低。最大应变率灵敏度指数0.0988出现在700℃，真实应变为0.65。温度敏感性随着应变率和真实应变的增加而降低;在0.01、0.1和1 s〜（-1）的应变速率下，应变硬化指数随真实应变的增加而缓慢减小，而在10 s〜（-1）的应变速率下，应变硬化指数急剧减小，特别是应变硬化指数当在750℃下真实应变> 0.55且应变速率为0.01s〜（-1）时，应变增加。此外，以Zener-Hollomon参数表示的本构方程可以对42CrMo钢在热成形过程中的塑性流动行为给出精确的估计（相关系数：R = O.99）。

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