金属热处理 ›› 2024, Vol. 49 ›› Issue (1): 284-290.DOI: 10.13251/j.issn.0254-6051.2024.01.046

• 冷却技术 • 上一篇    下一篇

淬火介质对7075铝合金残余应力影响的数值模拟及试验验证

唐鹏1,2,3,4, 陆声城1, 肖沛欣1, 黎家栋1, 何万尧1   

  1. 1. 广西大学 资源环境与材料学院, 广西 南宁 530004;
    2. 省部共建特色金属材料与组合结构全寿命安全国家重点实验室, 广西 南宁 530004;
    3. 广西生态型铝产业协同创新中心, 广西 南宁 530004;
    4. 广西南南铝航空交通铝合金新材料与应用研究院, 广西 南宁 530031
  • 收稿日期:2023-08-08 修回日期:2023-11-08 发布日期:2024-02-29
  • 作者简介:唐鹏(1980—),男,博士,主要研究方向为铝熔体处理及其合金强韧化,E-mail:tp@gxu.edu.cn
  • 基金资助:
    国家自然科学基金(52261024);广西自然科学基金(2023GXNSFAA026374);中国博士后科学基金(2021M693800);广西石化资源加工及过程强化技术重点实验室开放基金(2022K005)

Numerical simulation and experimental verification of influence of quenching media on residual stress of 7075 aluminum alloy

Tang Peng1,2,3,4, Lu Shengcheng1, Xiao Peixin1, Li Jiadong1, He Wanyao1   

  1. 1. School of Resources, Environment and Materials, Guangxi University, Nanning Guangxi 530004, China;
    2. State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, Nanning Guangxi 530004, China;
    3. Center of Ecological Collaborative Innovation for Aluminum Industry in Guangxi, Nanning Guangxi 530004, China;
    4. Institute of Southern Aluminum Aviation Transportation Aluminum New Materials and Application, Nanning Guangxi 530031, China
  • Received:2023-08-08 Revised:2023-11-08 Published:2024-02-29

摘要: 采用试验验证方法,结合有限元分析软件ABAQUS对水、10%NaCl溶液和机油3种不同介质淬火过程数值模拟,探究了淬火介质对7075合金力学性能和残余应力的影响机理。数值模拟结果表明,不同介质淬火后合金残余应力都表现出典型“内拉外压”的应力分布特点,并且10%NaCl溶液淬火后的试样内外残余应力最高,机油淬火后残余应力值最低,这与铝合金表面在不同介质淬火的热交换状态有关。试验结果表明,盐水介质在淬火过程中析出的盐晶体能使试样表面的蒸汽膜破碎而有较好的热交换速率,而机油介质则会在淬火过程中形成一层油膜,从而使试样与机油介质之间的热交换速率降低,导致不同介质淬火后的合金力学性能出现差异。试样淬火硬度值由大至小排序的淬火介质为:10%NaCl溶液、水、机油,与模拟结果中残余应力大小排序一致。

关键词: 7075铝合金, 淬火, 残余应力, 数值模拟

Abstract: Experimental verification method and numerical simulation of ABAQUS in different medias were used to explore the mechanism of three quenching medias (water, 10%NaCl solution and engine oil) on the mechanical properties and residual stress of 7075 aluminum alloy. The numerical simulation results show that the residual stress after quenching in three medias shows the typical stress distribution characteristics of "internal tension and external compression". Moreover, the residual stress of the specimen after quenching with 10%NaCl solution is the highest, and that with engine oil is the lowest, which is related to the heat exchange state of the aluminum alloy surface in different medias. The tested results show that the salt crystals precipitated in the brine quenching process can make the vapor film on the surface of the specimen broken and have a better heat exchange rate, while layer of oil film formed in the engine oil quenching process reduces the heat exchange rate between the specimen and oil, leading to differences in mechanical properties of the alloys quenched in different medias. According to the hardness values of the quenched specimen from large to small, the three quenching medias are 10%NaCl solution, water and engine oil, which is consistent with the order of residual stress in the simulation results.

Key words: 7075 aluminum alloy, quenching, residual stress, numerical simulation

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