Tribochemistry of inconel 617 during sliding contact at 950 °C under helium environment for nuclear reactors

JOURNAL OF NUCLEAR MATERIALS

卷:521

Article

Rahman, Md Saifur¹  Polychronopoulou, Kyriaki^1,2  Polycarpou, Andreas A.¹ 

[1] Texas A&M Univ, Dept Mech Engn, College Stn, TX 77843 USA

[2] Khalifa Univ, Dept Mech Engn, Abu Dhabi, U Arab Emirates

关键词: Nuclear reactor;    Helium tribology;    Inconel 617;    Tribochemistry;    Sliding wear;   

DOI  :  10.1016/j.jnucmat.2019.04.032

来源: Elsevier

【 摘 要 】

The present study, discusses the tribochemistry on the surfaces of Inconel 617 following tribological studies performed in He and air atmospheres at 950 degrees C. In the case of He atmosphere, uncoupling of the chemical and mechanical (wear) contributions was attained by performing aging experiments (namely heat treatment in He under 950 degrees C). In the case of tribo-experiments at 950 degrees C, studies of the surface inside and outside the wear track of the alloy using different microscopy and spectroscopy tools, along with pin-on-disk tribology experiments were employed. Under all conditions studied, the COF and wear were higher in He environment, compared to air atmosphere. For example, at 5 N normal load, 0.04 m/s sliding velocity, and temperature of 950 degrees C the COF was 0.45 in air and 1.4 in He. The formation and evolution of the metal oxides formed is tracked and discussed herein, as well as their contribution to tribochemistry, which plays a critical role in determining friction and wear performance of the alloy, especially at high temperature. (c) 2019 Elsevier B.V. All rights reserved.

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