TC11钛合金与5CrMnMo模具钢间接触换热实验研究

Experimental investigation of contact heat transfer between TC11 titanium alloy and 5CrMnMo die steel

基于稳态热流法,利用自制的接触换热系数测量装置对TC11钛合金与5CrMnMo模具钢间的接触换热进行测试,探讨了界面荷载、界面温度、接触面粗糙度和玻璃润滑剂对接触换热系数的影响.实验结果表明:接触换热系数随界面荷载的增加而增大,且与界面荷载的幂指数函数近似成正比关系;接触换热系数随界面温度的升高总体上呈增大趋势;在相对较小的粗糙度范围内,产生接触换热系数随接触面粗糙度增加而增大的反常现象;玻璃润滑剂的存在使接触换热系数降低了1～2个数量级,厚度的影响尤其明显.

Based on the steady-state heat flow method, the contact heat transfer between TCll titanium alloy and 5CrMnMo die steel is measured using the self-developed thermal contact conductance experimental apparatus. The effect of interfacial pressure, interfacial temperature, surface roughness and glass lubricant on thermal contact conductance is discussed. The results indicate that thermal contact conductance increases with the increasing of interfacial pressure, and it is nearly proportional to the exponent function of interfacial pressure. When interracial temperature is increased, thermal contact conductance is increased generally. It yields abnormal phenomena that thermal contact conductance increases with the increasing of surface roughness in the range of small roughness relatively. In addition, glass lubricant decreases thermal contact conductance by 1-2 orders of magnitudes, especially thickness of lubricant coating influences it clearly.