ABSTRACT

Wang, X. and Yu, Y., 2018. Effects of equal channel angular extrusion assisted by ultrasonic and subsequent heat treatment on tribological properties of 65Mn for marine vessels. In: Liu, Z.L. and Mi, C. (eds.), Advances in Sustainable Port and Ocean Engineering. Journal of Coastal Research, Special Issue No. 83, pp. 350–355. Coconut Creek (Florida), ISSN 0749-0208.

The friction and wear properties of 65Mn processed by equal channel angular extrusion (ECAE) assisted by ultrasonic and subsequent heat treatment processing under dry sliding condition were evaluated on a block on ring MM-2000 tribometer. The effects of ECAE assisted by ultrasonic and heat treatment on the tribological properties of 65Mn were investigated. The worn surface morphologies of 65Mn were examined by scanning electron microscopy (SEM) and the wear mechanisms were discussed. The results showed that ECAE assisted by ultrasonic and heat treatment contributed to improve the friction and wear behaviours of 65Mn remarkably. The friction coefficient and wear loss of 65Mn decreased after ECAE assisted by ultrasonic and heat treatment. The maximum wear reduction was obtained when the heat treatment temperature after ECAE was 774 K. Adhesion wear and delamination were notable for the initial 65Mn. The material delamination was greatly abated when the heat treatment temperature of 65Mn processed by ECAE was 774 K.

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