Effects of grain boundary engineering treatment on fretting wear behavior of Inconel 690TT alloy
HAN Yong-ming1, HAN Jun-ling1, XIN Long1, LIU Ting-guang1, LU Yong-hao1, SHOJI Tetsuo1,2
1. National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China;
2. New Industry Creation Hatchery Center, Tohoku University, Sendai 980-8579, Japan
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.
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2020, Vol. 48 
