Wear-Resistance Improvement of 65Mn Low-Alloy Steel through Adjusting Grain Refinement by Cyclic Heat Treatment

Abstract

Refined microstructures achieved by cyclic heat treatment significantly contribute to improving the wear resistance of steels. To acquire the refined microstructures of 65Mn low-alloy steel, first, the specimens were solid solution-treated; then, they were subjected to cyclic heat treatment at cyclic quenching temperatures of 790–870 °C and quenching times of 1–4 with a fixed holding time of 5 min. The mechanical properties of 65Mn low-alloy steel in terms of hardness, tensile strength, elongation and wear resistance were characterized. Afterwards, the effect of cyclic heat treatment on microstructure evolution and the relationships between grain refinement and mechanical properties’ improvement were discussed. The results show that the average grain size firstly decreased and then increased with the increase in the quenching temperature. Hardness increased with grain refinement when the temperature was lower than 830 °C. Once the temperature exceeded 830 °C, hardness increased with the temperature increase owing to the enrichment of carbon content in the martensite. With the increase in cyclic quenching times, hardness continuously increased with grain refinement strengthening. In addition, both tensile strength and elongation could be significantly improved through grain refinement. The relationships among wear loss, hardness and average grain size showed that wear resistance was affected by the synthesis reaction of grain refinement and hardness. Higher hardness and refined grain size contributed to improving the wear resistance of 65Mn low-alloy steel.

Feasibility Study for the Remanufacturing of H13 Steel Heat-Treated TBM Disc Cutter Rings with Uniform Wear Failure Using GMAW

“…It can explain why the hardness of the base layer was higher than that of the surfacing repair layer in Figure 17 . Normally, high hardness leads to excellent wear resistance [ 20 ]. Still, the excellent compatibility of the steel ball with the wire material in the indent depth test resulted in a much shallower indent depth in the surfacing repair layer than the base layer.…”

“…The wear-resistant performance was characterized by indent depth h and hardness H [ 20 ]. The test procedure for measuring indent depth h was as follows: using CFT-I friction tester, dry friction test was firstly carried out in which a standard steel ball with a diameter of 4 mm repeatedly rubbed the friction plane of the wear-resistant sample; secondly, the indent depth h of the worn wear-resistant sampling was measured using VHX-2000C super depth-of-field microscope.…”

Revealing the Role of Cerium on Precipitation Behavior of In Situ TiC Particles and Wear Resistance of High‐Titanium Wear‐Resistant Steels

“…[1][2][3][4][5] The wear resistance of low-alloy wear-resistant steel increases with an increase in hardness because the microstructure of low-alloy wear-resistant steel is mainly martensite. [6] However, an increase in the hardness generally decreases the machinability and toughness of the material, which limits the potential development of low-alloy wearresistant steel. [7] Recently, the wear resistance of conventional low-alloy wear-resistant martensitic steels was improved by introducing ultrahigh-strength TiC particles into the matrix with no increase in hardness, yielding high-titanium wearresistant steel with superior wear resistance.…”

Surface Roughness Modeling of Hard Turning 080A67 Steel

“…Some studies were carried out to evaluate the characteristics of this steel type such as evaluating the degree of deformation when hot rolling [3], and evaluating friction coefficient [4]. Many studies have been carried out to improve the advantages of this type of steel, such as improving wear resistance by the heat treatment method [5][6][7][8], improving compressive residual stress in magnetic processing [9], developing technical solutions to produce high-quality products from the casting process [10], investigation of solutions to reduce microcracking on the surface [11], studies on the solutions to increase the hardness of the surface [12][13], etc. This type of steel is increasingly used to manufacture parts with high-quality requirements, which usually need some finished faces to assemble with other parts.…”