田曾,金万军,王倩,等.冷拔态GH4738合金热变形本构方程及热加工图[J].精密成形工程,2024,16(5):193-200.
TIAN Zeng,JIN Wanjun,WANG Qian,et al.Constitutive Equation for Hot Deformation and Hot Processing Map of Cold-drawn GH4738 Alloy[J].Journal of Netshape Forming Engineering,2024,16(5):193-200. |
| 冷拔态GH4738合金热变形本构方程及热加工图 |
| Constitutive Equation for Hot Deformation and Hot Processing Map of Cold-drawn GH4738 Alloy |
| 投稿时间：2024-01-24 |
| DOI：10.3969/j.issn.1674-6457.2024.05.022 |
| 中文关键词: GH4738合金 热变形 本构方程 热加工图 微观组织 |
| 英文关键词: GH4738 alloy hot deformation constitutive equation hot processing map microstructure |
| 基金项目:河北省重点研发计划(22351008D);河北省科技创新项目(SJMYF2022X04);中国航发自主创新专项资金(CXPT-2021-010) |
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| 中文摘要: |
| 目的 研究紧固件用冷拔态GH4738合金棒材在不同工艺参数下的热变形行为，为紧固件热加工工艺参数优化提供理论指导。方法 采用Gleeble-3500热模拟实验机对冷拔态GH4738合金棒材在变形温度1 000~1 080 ℃、应变速率1~10 s−1条件下进行了热压缩实验，变形量为50%。计算了该合金的材料常数和变形激活能Q，建立了基于峰值应力的冷拔态GH4738合金的本构方程，根据动态材料模型理论绘制了冷拔态GH4738合金的能量耗散图和失稳图，获得了合金在不同应变下的热加工图，并讨论了显微组织演变情况。结果 冷拔态GH4738合金的流变应力随着变形温度的增加或应变速率的减小而降低。线性回归的相关系数证实了描述该材料热变形行为的本构方程的准确性。基于冷拔态GH4738合金的热加工图及显微组织验证结果可得，冷拔态GH4738合金的主要失稳区工艺参数区间为1 000~1 035℃/0.12~3 s−1，1 030~1 072℃/ 0.25~10 s−1和1 075~1 080 ℃/2.72~10 s−1。热加工较佳工艺条件为1 000~1 028 ℃/0.02~0.14 s−1和1 040~1 080 ℃/ 0.06~0.74 s−1。结论 通过对冷拔态GH4738合金热变形本构方程和热加工图进行研究，获得了冷拔态GH4738合金优化的热变形工艺参数，可用于指导冷拔态GH4738合金的紧固件热加工成形。 |
| 英文摘要: |
| The work aims to study the hot deformation behavior of cold-drawn GH4738 alloy bars for fastener under different process parameters, providing theoretical guidance for optimizing the hot processing parameters of fasteners. Hot compression tests were performed by a Gleeble-3500 machine at deformation temperature of 1 000-1 080 ℃ and strain rate of 1-10 s−1, with a deformation of 50%. The material constants and deformation activation energy Q of the alloy were calculated, and a constitutive equation based on peak stress for cold-drawn GH4738 alloy was established. Energy dissipation maps and instability maps of the cold-drawn GH4738 alloy were drawn based on the theory of dynamic material models. Hot processing maps of the alloy under different strains were obtained, and the evolution of the microstructure was discussed. The results showed that the flow stress of the cold-drawn GH4738 alloy decreased with increasing deformation temperature or decreasing strain rate. The accuracy of the constitutive equation describing the hot deformation behavior of the material was confirmed by the correlation coefficient of linear regression. Based on the hot processing maps and microstructure verification results of the cold-drawn GH4738 alloy, the main instability zone ranges were 1 000-1 035 ℃/0.12~3 s−1, 1 030-1 072 ℃/0.25~10 s−1, and 1 075- 1 080 ℃/2.72-10 s−1. The optimal process conditions for hot processing were 1 000-1 028 ℃/0.02-0.14 s−1 and 1 040- 1 080 ℃/0.06-0.74 s−1. Through the study of the constitutive equation and hot processing maps of the cold-drawn GH4738 alloy, the optimal hot deformation process parameters have been obtained, which can be used to guide the hot forming processes of fasteners made from cold-drawn GH4738 alloy. |
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