Effects of grain boundary engineering treatment on fretting wear behavior of Inconel 690TT alloy

Abstract

The grain boundary engineering (GBE) treatment of heat treatment and cold rolling was adopted.The fretting wear behavior of Inconel 690TT alloy in air at room temperature and 320 ℃ was studied by OM, SEM, EBSD and white light interferometer. The results show that the proportion of low-∑ CSL boundaries of the best GBE sample is more than 70%, which is produced after 5% cold rolling,high temperature and short time annealing. The wear volumes and friction coefficients of the Inconel 690TT alloy samples at room temperature and 320 ℃ decrease with the increase of hardness and increase with the increase of grain size and low-∑ CSL boundary fraction. The fretting zone characteristic of Inconel 690TT alloy samples with larger grain sizes and higher proportion of low-∑ CSL boundaries under the same fretting experimental parameters is prone to full sliding, whereas it tends to partial sliding. Compared with grain size, the low-∑ CSL boundary fraction plays a more important role in determining the fretting behavior of GBE samples. The sample with higher fraction of low-∑ CSL boundaries has lower resistance to fretting wear, so GBE treatment is inimical to improving the fretting wear resistance of materials.

Keywords

• inconel 690tt alloy
• grain boundary engineering
• fretting wear
• low-∑ csl boundary
• grain size