THERMAL SCIENCE
International Scientific Journal
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 tem-perature 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.
KEYWORDS
PAPER SUBMITTED: 2019-10-18
PAPER REVISED: 2019-12-04
PAPER ACCEPTED: 2019-12-08
PUBLISHED ONLINE: 2020-01-04
THERMAL SCIENCE YEAR
2020, VOLUME
24, ISSUE
Issue 1, PAGES [313 - 324]
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