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This study examined the toughness improvement of a track shoe used as the undercarriage of excavator and bulldozer parts. The excavator is operated under poor conditions, such as the build-up field and quarry. Therefore, the track shoe requires high strength and impact toughness to endure immense shock while at work. The track shoe was made of heat treated boron steel. The sufficient possibility of hardenability with the theoretical Jominy curve for boron steel was confirmed while quenching. The Taguchi orthogonal array experiment method was used to optimize the process variables, such as area reduction ratio and heat treatment conditions (tempering temperature and holding time), to achieve toughness improvement. The toughness of the track shoe increased with increasing area reduction, and a tempering temperature of 210 ℃ and a tempering time of 80 min are beneficial for improving the toughness of the track shoe. Key Words : Boron steel, Jominy curve, Optimization, Taguchi orthogonal array experiment, Track shoe

Impact toughness improvement of an undercarriage track shoe using the Taguchi orthogonal array experiment