退火处理对VW94M镁合金螺纹滚压成形性能的影响

doi:10.13251/j.issn.0254-6051.2026.02.045

摘要/Abstract

摘要： 为解决VW94M镁合金在滚压螺纹时出现的烂牙问题,对其进行不同温度(480~560 ℃)的退火处理,并利用金相显微镜、维氏硬度计和万能试验机对退火后合金的组织和性能进行了观察和测试,且进行了螺纹滚压测试。结果表明,随退火温度升高,VW94M镁合金组织中孪晶数量先增多后减少,相应的伸长率先升高后降低。高密度孪晶主导了塑性变形机制,有效提升了镁合金在冷成形过程中的协调变形能力。退火温度为520 ℃时,孪晶数量最多,组织中有50%以上的高密度孪晶,平均伸长率达15.8%左右,平均硬度约90 HV,显著改善了VW94M镁合金的滚压成形性能,成功解决了滚压螺纹过程中的烂牙问题。

关键词: VW94M镁合金, 退火, 孪晶, 滚压螺纹

Abstract: To address the issue of thread tearing during the thread rolling of VW94M magnesium alloy, annealing treatments at different temperatures (480-560 ℃) were carried out. The microstructure and properties of the annealed alloy were observed and tested using optical microscopy,Vickers hardness tester, and universal testing machine, followed by thread rolling tests. The results show that as the annealing temperature increases, the number of twins in the alloy first increases and then decreases, with a corresponding increase and subsequent decrease in elongation. High-density twins dominate the plastic deformation mechanism, effectively enhancing the coordinated deformation capability of the magnesium alloy during cold forming. At annealing temperature of 520 ℃, the number of twins is the highest, with over 50% high-density twins. The average elongation reaches approximately 15.8%, and the average hardness is about 90 HV, significantly improving the thread rolling formability of the alloy and successfully resolving the issue of thread tearing during the rolling process.

Key words: VW94M magnesium alloy, annealing, twins, roll-formed threads

中图分类号:

TG156.2

唐建良, 蒋杨英, 江佶峰, 张文波. 退火处理对VW94M镁合金螺纹滚压成形性能的影响[J]. 金属热处理, 2026, 51(2): 301-304.

Tang Jianliang, Jiang Yangying, Jiang Jifeng, Zhang Wenbo. Effect of annealing on roll-forming performance of VW94M magnesium alloy thread[J]. Heat Treatment of Metals, 2026, 51(2): 301-304.

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