Effect of cylinder liner cast iron microstructure on friction and wear process

Abstract

The diversified microstructure and complex composition of cast iron affect its friction and wear properties. In this work, three kinds of cylinder liner cast iron with different graphite morphologies were selected to analyse the friction and wear properties. Microstructure effects on tribological properties during friction were investigated by finite element simulation and pin-on-disc dry friction test. Wear mechanisms were studied using scanning electron microscopy and X-ray photoelectron spectroscopy. The results show that graphite bears a considerable strain value during the friction process, which is prone to wear and fall off, and the fallen graphite can reduce the friction coefficient. Ferrite around graphite can buffer stress, but it also can reduce wear resistance. And the more significant the lamellar spacing of pearlite, the more abrasive and adhesive effect.

Effects of Heat Treatment on Microstructures and Mechanical Properties of a Low-Alloy Cylinder Liner

“…For instance, researchers have proposed using composite materials [5,6] and applying surface modification technologies [7][8][9][10][11][12] to enhance the mechanical properties and wear resistance of cylinder liners. However, cylinder liner materials such as boron alloy cast iron, high-phosphorus cast iron, and vanadium-titanium cast iron have higher wear rates [13], lower strength, and lesser wear resistance [14] due to the increased spacing between pearlite structures in cast iron. The tensile strength of these materials is low, with σ b ranging from 200 MPa to 300 MPa and hardness from 210 HB to 260 HB.…”