6061铝合金淬火冷却过程中的表面换热系数  

Surface heat transfer coefficient of 6061 aluminum alloy during quenching

作　　者：温柳[1] 刘露露[1] 高萌[1] 潘学著 王迎新 陈彬[1] 王孟君[1] 

机构地区：[1]中南大学有色金属材料科学与工程教育部重点实验室,湖南长沙410083 [2]广亚铝业有限公司,广东佛山528237

出　　处：《金属热处理》2011年第10期59-62,共4页Heat Treatment of Metals

基　　金：广东省重大科技专项(2009A080205003)

摘　　要：通过6061铝合金末端淬火测得的冷却曲线,结合有限差分法和反传热求解法,研究了6061合金固溶处理在不同冷却方式下的冷速及表面换热系数与温度的变化规律。结果表明,6061铝合金在水雾冷和喷水冷却过程中,端面冷速先增大后减小,在400℃左右达到峰值,峰值冷速约为30℃/s。6061铝合金的表面换热系数与温度呈非线性关系,其大小随着温度的降低先逐渐增大,在150～100℃范围内达最大值,然后下降;在风冷过程中,表面换热系数值先急剧增大,当温度下降到500℃后增速明显减慢。The 6061 aluminum alloy cooling rate curves and surface heat transfer coefficient variation with temperature under different cooling methods was studied through using cooling curves which were obtained by end-quench,combine with finite difference method and inverse heat conduction method.The results show that when using mist spray and water spray quench,the cooling rate firstly increases,at about 400 ℃,reaches to its peak value about 30 ℃ /s,then decreases;surface heat transfer coefficient with temperature is nonlinear,which firstly increases to the maximum at 150-100 ℃,then decreases quickly with quench temperature decreasing.Surface heat transfer coefficient of wind quench raises rapidly,but increasement of the coefficient slows down obviously when temperature decreases to 500 ℃.

关 键 词：6061铝合金 末端淬火 冷却曲线 反传热法 表面换热系数 

分 类 号：TG166.3[金属学及工艺—热处理]