基于JMatPro对2324铝合金析出相的热力学模拟计算

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本站小编 Free考研考试/2024-10-07

作者:\n\t赵明铭,郭二军,冯义成,付金来,王丽萍,付原科\n

Authors:ZHAO Ming-ming,GUO Er-jun,FENG Yi-cheng,FU Jin-lai,WANG Li-ping,FU Yuan-ke摘要:\n\t摘要:2324铝合金具有优异的综合性能，尤其是高的损伤容限性能，作为结构材料在先进大飞机上得到广泛应用，其热处理工艺是保证高综合性能的关键。本文以工业用2324铝合金为研究对象，采用JMatPro软件模拟计算2324铝合金的平衡相组成、亚稳相、TTT/CCT曲线、等温时效相组成，并优化其热处理工艺参数。研究结果表明，2324铝合金在室温条件下的相组成为88.02% α(Al)、7.28% S(Al₂CuMg)、2.45% Al₆Mn、1.35% Al₂Cu、0.63% E(AlCrMgMn)和0.27% Mg₂Si，其中S相是主要的强化相；合金的亚稳相为S′相、Q′相和η′相，其中S′相为时效过程主要强化相；通过TTT曲线计算表明，在热处理过程中，GP区、η′、S′、η(MgZn2)、S相的鼻尖温度依次升高，分别为170、300、350、360、420℃，对应的孕育时间分别为5.45、40.91、15.23、920.62、305.83s。CCT曲线计算表明，在热处理过程中，GP区、η′、S′、η(MgZn₂)、S相不析出的临界冷却速率分别为0.95、1.72、5.22、0.16，0.90℃/s；在190℃时效时，S′相的析出量较大，完全时效时间也较短。时效时间为5~10h时，强化相含量较高，GP区也有一定含量；因此，综合上述结果可以得出最佳的热处理工艺：固溶处理时，冷却介质的冷却速度大于5.22℃/s，试样固溶转移时间小于5.45s，时效的温度和时间分别设置为190℃，5~10h。\n

Abstract:Abstract:2324 aluminum alloy has excellent comprehensive performance, especially high damage tolerance performance As a structural material, it has been widely used in advanced large aircraft, and its heat treatment process is the key to ensure high comprehensive performance.This paper takes 2324 aluminum alloy for industrial use as the research object. The equilibrium phase composition, metastable phase, TTT/CCT curve and isothermal aging phase composition of 2324 aluminum alloy are simulated by JMatPro software, and the heat treatment process parameters are optimized. The results show that the phase composition of 2324 aluminum alloy at room temperature is 88.02% α(Al), 7.28% S(Al₂CuMg), 2.45% Al6Mn, 1.35% Al2Cu, 0.63% E(AlCrMgMn) and 0.27% Mg₂Si, among which S phase is the main strengthening phase.The metastable phase of the alloy is S′ phase, Q′ phase and η′ phase, among which S′ phase is the main strengthening phase during the aging process.The TTT curve calculation show that during the heat treatment, the tip temperatures of GP zone, η′, S′, η(MgZn₂) and S phase increase successively, which are 170℃, 300℃, 350℃, 360℃ and 420℃ respectively, and the corresponding incubation times are 5.45s, 40.91s, 15.23s, 920.62s and 305.83s respectively The CCT curve calculation shows that the critical cooling rates of GP zone, η′, S′, η(MgZn₂) and S phase without precipitation during heat treatment are 0.95℃/s, 1.72℃/s, 5.22℃/s, 0.16℃/s and 0.90℃/s respectively.When aging at 190℃, the precipitation amount of S′ phase is larger, and the complete aging time is shorter.When the aging time is 5~10h, the strengthening phase content is higher, and there is also a certain content for GP zone.Therefore, by the above results, the optimal heat treatment process can be obtained: the cooling rate of the cooling medium is greater than 5.22℃/s in the solid solution treatment, the solid solution transfer time of the sample is less than 5.45s, and the aging temperature and time are respectively set at 190℃ and 5~10h.

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基于JMatPro对2324铝合金析出相的热力学模拟计算

本站小编 Free考研考试/2024-10-07

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