Effects of contact pressure and interface temperature on thermal contact resistance between 2Cr12NiMoWV/BH137 and γ-TiAl/2Cr12NiMoWV interfaces

Abstract

Thermal contact resistance between interfaces is an important parameter in the analysis of temperature distribution for structural components. Thermal contact resistance between heat resistant steel 2Cr12NiMoWV/aluminum alloy BH137 interfaces and 2Cr12NiMoWV/titanium alloy γ-TiAl interfaces were experimentally investigated in the present paper. The effects of contact pressure and interface temperature were detailed. The temperature of contacting surfaces was from 80-250 ℃, and the contact pressure ranged from 2-17 MPa. All experiments were conducted in ambient atmosphere. Results showed that thermal contact resistance decreases with an increment of interface temperature or contact pressure. Under the same conditions of contact pressure and interface temperature, thermal contact resistance between 2Cr12NiMoWV and BH137 interfaces is lower than that between 2Cr12NiMoWV and γ-TiAl interfaces. The temperature dependence of thermal conductivity and mechanical properties was analyzed to explain the results. Furthermore, with the piston and piston pin as the research object, steady state temperature fields were simulated in cases of considering thermal contact resistance and without considering thermal contact resistance, respectively. The results showed that the maximum temperature of the piston pin will be lower when thermal contact resistance is considered.

Thermo elasto-plastic contact analyzis for high temperature applications

“…A coupled mechanical and energy equations are solved using numerical methods. It is noticed that thermal effects have a crucial role in contact behavior [41][42][43]. Instead of using a perfect concept of contact, authors have used the correlation of Thermal Contact Conductance (TCC) [42] to model the structural-thermal contact.…”

Effect of Residual Stress in Surface Layer on Plastic Yield Inception

“…When two solids come into contact, stress and deformation are produced. The characterization of the contact behavior of solids is not only highly crucial for analyzing tribological problems such as friction, wear, and lubrication [7][8][9], but also for other technological problems such as thermal and electrical contact resistance [10][11][12]. When solids with residual stress are in contact, the residual stress in the surface layer is superimposed on the stress generated by the contact, changing the critical load of yield inception and strengthening or weakening the surface layer/substrate system.…”