(大連理工大學(xué) 材料科學(xué)與工程學(xué)院，大連 116085)
摘 要: 基于反傳熱算法，制造一套瞬態(tài)接觸換熱系數(shù)測量裝置，研究高溫TP2銅與低溫3Cr2W8V模具鋼的瞬態(tài)接觸換熱過程。結(jié)果表明：接觸載荷在1.56~7.80 MPa范圍內(nèi)變化時，高溫TP2銅的初始溫度為400、500和600 ℃，低溫3Cr2W8V模具銅的初始溫度為100、200和300 ℃。瞬態(tài)接觸換熱系數(shù)在很短時間內(nèi)(5 s)快速增大到某一恒定值，并隨著時間延長，產(chǎn)生緩慢的后續(xù)增加過程。接觸換熱系數(shù)隨著接觸載荷的增加而增大，呈冪指數(shù)關(guān)系，且試樣初始溫度越高，接觸換熱系數(shù)增大的趨勢越快。
關(guān)鍵字: TP2銅；3Cr2W8V模具鋼；瞬態(tài)法；反傳熱算法；接觸換熱系數(shù)
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
