(大连理工大学 材料科学与工程学院，大连 116085)
摘 要: 基于反传热算法，制造一套瞬态接触换热系数测量装置，研究高温TP2铜与低温3Cr2W8V模具钢的瞬态接触换热过程。结果表明：接触载荷在1.56~7.80 MPa范围内变化时，高温TP2铜的初始温度为400、500和600 ℃，低温3Cr2W8V模具铜的初始温度为100、200和300 ℃。瞬态接触换热系数在很短时间内(5 s)快速增大到某一恒定值，并随着时间延长，产生缓慢的后续增加过程。接触换热系数随着接触载荷的增加而增大，呈幂指数关系，且试样初始温度越高，接触换热系数增大的趋势越快。
关键字: TP2铜；3Cr2W8V模具钢；瞬态法；反传热算法；接触换热系数
TP2 copper and 3Cr2W8V die steel
（School of Materials Science and Technology, Dalian University of Technology, Dalian 116085, China）
Abstract:Based on the principle of inverse heat transfer problems, a new experimental apparatus was developed to measure the contact heat transfer coefficient in the transient condition. The transient contact heat transfer was investigated between the hot TP2 copper and cold 3Cr2W8V steel. The results show that the contact pressure is in the range of 1.56−7.80 MPa, the initial temperatures of the hot TP2 copper are 400, 500 and 600 ℃, and the initial temperatures of the cold 3Cr2W8V steel are 100, 200 and 300 ℃. The contact heat transfer coefficient increases rapidly to a level in a very short time (5 s), from which a much slower increase occurs. The contact heat transfer coefficient increases with increasing contact pressure according to the power law correlation, and it is relatively high at high initial temperature.
Key words: TP2 copper; 3Cr2W8V steel; transient method; inverse heat transfer method; contact heat transfer coefficient
