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<p>This paper presents the results of a study on the laser remelting and laser transformation hardening of mandrel H13 steel (quenched and tempered) for a tube rolling mill. The surface of the specimens was irradiated with a continuous high-power fibre laser (RFL-C3300) with a spot size of 12 &#xa0;mm  × 2&#xa0;mm. A comparison of the morphological organisation, microhardness and high-temperature wear resistance of the laser-remelted and laser-phase-change-hardened specimens was carried out to investigate the effect of laser process parameters on the organisation and properties of H13 steel. The results show that the laser-remelted specimens had a better hardening effect and wear resistance at the same power. The solidification organisation of the laser-remelted specimens was mainly in the form of fine equiaxed cells and columnar cells, and the martensite in the phase-change-hardened zone was fine and dense. The microhardness of the surface of the laser-remelted specimens was up to 794.0 HV<sub>0.2</sub>, which is about 2.6 times higher than that of the substrate. The coefficient of friction and the amount of wear were as low as 0.39 and 0.1221&#xa0;mm<sup>3</sup>, respectively, and the wear mechanism was mainly abrasive wear.</p>

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The Effect of Laser Surface Hardening on Microstructure and High Temperature Wear Resistance of H13 Steel for Mandrel of Tube Mill

  • 期刊论文

  • 发表日期：

    2025年1月14日

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  • Liqiang Wang,
  • Jianming Zhao,
  • Xiangfang Fan

摘要

This paper presents the results of a study on the laser remelting and laser transformation hardening of mandrel H13 steel (quenched and tempered) for a tube rolling mill. The surface of the specimens was irradiated with a continuous high-power fibre laser (RFL-C3300) with a spot size of 12  mm  × 2 mm. A comparison of the morphological organisation, microhardness and high-temperature wear resistance of the laser-remelted and laser-phase-change-hardened specimens was carried out to investigate the effect of laser process parameters on the organisation and properties of H13 steel. The results show that the laser-remelted specimens had a better hardening effect and wear resistance at the same power. The solidification organisation of the laser-remelted specimens was mainly in the form of fine equiaxed cells and columnar cells, and the martensite in the phase-change-hardened zone was fine and dense. The microhardness of the surface of the laser-remelted specimens was up to 794.0 HV0.2, which is about 2.6 times higher than that of the substrate. The coefficient of friction and the amount of wear were as low as 0.39 and 0.1221 mm3, respectively, and the wear mechanism was mainly abrasive wear.