Effects of Temperature on the Fretting Wear Behavior of 2.25Cr-1Mo Tubes against Gr5C12 Rods

Abstract

In the heat exchangers of sodium-cooled fast reactors, sodium flow can cause the tubes to vibrate, resulting in fretting wear damage due to the contact between the tubes (2.25Cr-1Mo steel) and their support plate (Gr5C12 alloy). In this work, the effects of temperature on the fretting wear behavior of a 2.25Cr-1Mo heat transfer tube on a Gr5C12 alloy rod were studied. The results showed that the coefficient of friction (COF) and wear volume increased first and then decreased with the increase in temperature. Moreover, 2.25Cr-1Mo showed great wear performance at high temperatures than at room temperature and 80 °C, because of the antifriction nature of the oxidative layer and the high hardness of the tribological transformed structure layer. As the temperature increased, material transfer and plastic deformation became increasingly obvious, but average wear depth decreased. This provides data support for the practical engineering application of 2.25Cr-1Mo steel at elevated temperatures. Wear mechanisms were found to depend modestly on temperature and largely on normal load. As temperature increases, the wear mechanism gradually changes from abrasive wear to adhesive wear.

Atomic simulations of nanoscale friction behavior in polycrystalline alloy 690

“…The above articles and other similar reports have shown that the key to understanding the wear of these alloys lies in the friction process. In fact, fretting wear includes many mechanisms, including abrasive, adhesive, and corrosion wear, of which abrasive and adhesive wear will be produced during the friction process [5,6]. Vanossi et al [7] summarized research progress on tribological phenomena in recent years and noted that the actual origin of friction was at the atomic scale; thus, the study of friction at the atomic scale has become increasingly important.…”

Effect of austenitic stainless steel cladding on the high-temperature oxidation resistance of Ferritic 2.25Cr-1Mo (Grade 22) steel using SMAW process

“…Additionally, some researchers are keen on the wearing and corrosion of this material and have performed several explorations [10,11]. Recently, Wang et al have studied the tangential fretting wear of 2.25Cr-1Mo steel and the effect of 2.25Cr-1Mo steel wear behavior at high temperatures [10,12].…”