不同Cr含量Cu-Cr-Zr合金的热拉伸变形行为

doi:10.13251/j.issn.0254-6051.2021.09.005

摘要/Abstract

摘要： 采用Gleeble-3810热模拟试验机进行高温热拉伸试验,研究了不同Cr含量的Cu-Cr-Zr合金在变形温度350~500 ℃,应变速率0.01~1 s^-1范围内的流变行为。发现随着应变速率和Cr含量的升高以及变形温度的降低,Cu-Cr-Zr合金的流变应力呈现上升规律。对断口组织的分析发现,应变速率、变形温度以及Cr含量通过影响热拉伸过程中韧窝等结构的生成及形态变化改变材料的性能。Cr含量的增加引发了固溶强化和时效析出强化,提升了材料的热拉伸峰值应力。利用热拉伸数据建立了改进的Johnson-Cook本构模型,模型计算结果与试验数据吻合程度较高。

关键词: Cu-Cr-Zr合金, Cr含量, 热变形行为, Johnson-Cook本构模型

Abstract: High-temperature thermal tensile experiments were carried out by using Gleeble-3810 thermal simulation tester to study the flow behavior of Cu-Cr-Zr alloys with different Cr contents at deformation temperature of 350-500 ℃ and strain rate of 0.01-1 s^-1. The results show that with the increase of strain rate, Cr element content and decrease of deformation temperature, the flow stress of Cu-Cr-Zr alloy increases. The analysis of the fracture structure suggests that the strain rate, deformation temperature, and Cr content can change the properties of the material by affecting the formation and morphological changes of dimples and other structures during the thermal tensile process. The increase of Cr content triggers solid solution strengthening and aging precipitation strengthening, which increases the thermal tensile peak stress of the material. Using the experimental results, an improved Johnson-Cook constitutive model is established, and it is found that the calculated results by the model are in good agreement with the experimental data.

Key words: Cu-Cr-Zr alloy, Cr content, thermal deformation behavior, Johnson-Cook model

中图分类号:

TG146.1

廖雪峰, 张恒, 何学青, 黄元春, 李明. 不同Cr含量Cu-Cr-Zr合金的热拉伸变形行为[J]. 金属热处理, 2021, 46(9): 28-35.

Liao Xuefeng, Zhang Heng, He Xueqing, Huang Yuanchun, Li Ming. Thermal tensile deformation behavior of Cu-Cr-Zr alloy with different Cr content[J]. Heat Treatment of Metals, 2021, 46(9): 28-35.

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