摘要
通过喷水淬火实验获得6061铝合金的冷却曲线,结合数值计算方法获得材料的在线淬火换热系数,运用ABAQUS有限元软件对带筋圆管在线淬火过程进行了动态模拟。结果表明:在淬火开时阶段,换热系数较小,随着淬火温度降低,换热系数逐渐增大至峰值2kW/m2℃,随后又逐渐减小;在圆管筋部外边缘处冷却最快,型材内表面与筋的连接处冷却最慢;淬火开始2s内型材的整体温差近100℃,随后温差显著减小,型材各部分的温度趋于均匀;淬火初始阶段,管外壁及筋外壁表现为拉应力,管内壁和筋内壁表现为压应力,随着淬火的进行,压应力和拉应力互相转变,最大拉应力和压应力分别为21.7MPa和28.7MPa。
Cooling curve of 6061 aluminum alloy was obtained by aid of spray quenching experiments. The heat transfer coefficient of online quenching for 6061 aluminum alloy was obtained combining with numerical calculation method. And dynamic simulation for online quenching process of tube with tendon was carried out using ABAQUS finite element software.
出处
《铝加工》
CAS
2013年第6期10-14,共5页
Aluminium Fabrication
