The influence of carbide coarsening on the friction properties of thermally affected 9_12 wt. % Cr steels

6th International Conference on Fracture Fatigue and Wear

Velkavrh, I.^1 ; Kafexhiu, F.^2 ; Klien, S.^1 ; Ausserer, F.^1 ; Voyer, J.^1 ; Diem, A.^1 ; Podgornik, B.^2

V-Research GmbH, Stadtstrasse 33, Dornbirn

6850, Austria^1

Institute of Metals and Technology, Lepi pot 11, Ljubljana

1000, Slovenia^2

关键词: Carbide coarsening;    Coefficient of frictions;    Contacting surfaces;    Friction properties;    Friction test;    Frictional properties;    Oxidative properties;    P91 steel;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/843/1/012065/pdf
DOI  :  10.1088/1742-6596/843/1/012065

来源: IOP

【 摘 要 】

The purpose of the present study is to evaluate the influence of tempering-induced carbide coarsening in the heat affected zone of two grades of 9-12 wt. % Cr steels, X20 and P91, on their friction properties. In order to compare the frictional properties of the selected microstructures without and with the presence of oxides on the contacting surfaces, friction tests were performed under Ar atmosphere and in air. It was observed that after tempering, coefficient of friction increases for both steels in both atmospheres. This deterioration of friction properties after tempering is probably due to the precipitation of carbides, which acted as mechanical anchors and/or increased the surface energy of steel. Since neither the number of carbides nor their size distribution showed an influence on the friction properties of the selected steels, it is presumed that the minor differences between the friction properties of the tempered X20 and P91 steels are primarily related to their oxidative properties.