2195铝锂合金浸入式末端淬火实验与温度场有限元模拟  

Immersion end quenching experiment and finite element simulation of temperature field of 2195 Al-Li alloy

作　　者：肖博 李承波 曹普立 郑学军[1] 赵偲 XIAO Bo;LI Chengbo;CAO Puli;ZHENG Xuejun;ZHAO Cai(School of Mechanical Engineering and Mechanics,Xiangtan University,Xiangtan 411105,China;Guangdong Xingfa Aluminum Co.,Ltd.,Foshan 528137,China)

机构地区：[1]湘潭大学机械工程与力学学院,湘潭411105 [2]广东兴发铝业有限公司,佛山5281371

出　　处：《中国有色金属学报》2024年第7期2227-2239,共13页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(52205421);广西科技重大专项(桂科AA23023028);广东省重点研发计划资助项目(2022B0909070001,2020B010186001,2021B0101220006)。

摘　　要：通过浸入式末端淬火实验和有限元模拟研究了2195铝锂合金的淬火温度场,获得不同位置的冷却曲线和硬度,结合微观组织分析2195铝锂合金的淬火敏感性机理。结果表明:2195铝锂合金板材的界面传热系数与表面温度之间存在非线性关系,当样品表面温度降低时,界面传热系数先升高后降低,在101℃左右达到最大值28.3 kW/(m^(2)∙℃);2195铝锂合金采用浸入式末端淬火时,淬火速率随着距离浸入端距离的增加而减小;随着淬火速率的减小,淬火析出相的尺寸和面积分数均增加,硬度随之降低;当淬火速率从402.5℃/s下降至3.9℃/s时,硬度下降率为25.6%。同时,分别建立了硬度值H和硬度下降率ΔH与淬火析出相的面积分数A的关系曲线。在慢速淬火过程中,由于大量淬火析出相的析出,影响后续时效过程中T1相的析出和长大,导致强化效果显著降低,合金的硬度大幅下降。Through immersion-end quenching experiments and finite element simulations,we investigated the quenching temperature field,obtained cooling curves and hardness at different locations,and combined microscopic structure analysis to explore the quenching sensitivity mechanism of Al-Li alloys.The results indicate that there is a nonlinear relationship between the interfacial heat transfer coefficient of Al-Li alloy plates and the surface temperature.As the surface temperature of the sample decreases,the interfacial heat transfer coefficient initially increases and then decreases,reaching a maximum value of 28.3 kW/(m^(2)∙℃)at around 101℃during immersion end quenching.When 2195 aluminum-lithium alloy is quenched by immersion end quenching,the quenching rate decreases with increasing distance from the immersion end.With the decrease in quenching rate,the size and area fraction of quenched phases increase,leading to a decrease in hardness.When the quenching rate decreases from 402.5℃/s to 3.9℃/s,the hardness reduction rate is 25.6%.The relationship curves were established for hardness value(H)and hardness reduction rate(ΔH)with the area fraction(A)of quenched phases.In the slow quenching process,due to the continuous precipitation of quenched phases,the subsequent precipitation and growth of the T1 phase during aging are affected,resulting in a significant decrease in the strengthening effect and a substantial reduction in alloy hardness.

关 键 词：铝锂合金 末端淬火 温度场 有限元法 淬火析出相 

分 类 号：TG146.2[一般工业技术—材料科学与工程]