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Flow behaviour constitutive model of CuCrZr alloy and 35CrMo steel based on dynamic recrystallization softening effect under elevated temperature

基于动态再结晶软化效应的CuCrZr 和35CrMo 高温流变行为本构模型

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Abstract

In order to study the effect of dynamic recrystallization on the metal flow behavior during thermal deformation, the elevated temperature compression experiments of CuCrZr alloy and 35CrMo steel are carried out using Gleeble-3810 thermal simulator. It is proved that the samples underwent obvious dynamic recrystallization behavior during thermal deformation by microstructure observation of deformed specimens. The size of recrystallized grains increases as the temperature improved and the strain rate decreased. Meanwhile, the net softening rate caused by dynamic recrystallization is determined based on the stress-dislocation relationship. It can be found that the value of net softening rate increases quadratically as the Z parameter decreases, and the dynamic recrystallization net softening rate of CuCrZr alloy and 35CrMo steel are calculated to be 21.9% and 29.8%, respectively. Based on the dynamic recrystallization softening effect proposed, the novel elevated temperature flow constitutive models of two different alloys are proposed, and the related parameters are well defined and solved in detail. The predicted values of the obtained models are agreed well with the experimental values.

摘要

为了研究热变形过程中动态再结晶对金属流变行为的影响,采用Gleeble-3800 热模拟机对 CuCrZr 合金和35CrMo 钢进行了高温压缩实验。通过观察热变形后样品的金相组织,证明了样品在热 变形过程中经历了明显的动态再结晶,且动态再结晶晶粒尺寸随着变形温度的升高和应变速率的降低 而增大。以应力-位错密度的关系为理论依据,定义了由动态再结晶所引起的净软化作用η。η 与 Z 参 数之间呈三次递减关系。计算得到的CuCrZr 合金和35CrMo 钢的最大η 值分别为21.9%和29.8%。基 于所提出的动态再结晶软化效应,构建了两种合金的高温流动行为本构模型。并对模型参数进行了定 义和求解。所建模型的预测值与实验所得的数据高度吻合。

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Authors and Affiliations

  1. Light Alloy Research Institute, Central South University, Changsha, 410012, China

    Yuan-chun Huang  (李明), Ming Li  (李明), Zheng-bing Xiao  (肖政兵) & Yu Liu  (刘宇)

  2. College of Mechanical and Electrical Engineering, Central South University, Changsha, 410012, China

    Yuan-chun Huang  (李明) & Zheng-bing Xiao  (肖政兵)

  3. Capital Aerospace Machinery Corporation Limited, Beijing, 100076, China

    Cun-qiang Ma  (马存强)

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  1. Yuan-chun Huang  (李明)
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Correspondence to Yu Liu  (刘宇).

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Foundation item: Project(2019zzts525) supported by the Fundamental Research Funds for the Central Universities, China; Projects(U1837207, U1637601) supported by the National Natural Science Foundation of China

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Huang, Yc., Li, M., Ma, Cq. et al. Flow behaviour constitutive model of CuCrZr alloy and 35CrMo steel based on dynamic recrystallization softening effect under elevated temperature. J. Cent. South Univ. 26, 1550–1562 (2019). https://doi.org/10.1007/s11771-019-4111-x

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