External authors:

• Yazhe Chen ( Northeastern University - China )
• Qingyu Shang ( Shenyang University of Chemical Technology )
• Youwei Zhang ( Shenyang University of Chemical Technology )
• Ying Yao ( Shenyang University of Chemical Technology )
• Adesh Kumar Tomar ( Pontificia Universidad Catolica de Chile )
• Risheng Long ( Shenyang University of Chemical Technology )

Abstract:

PurposeThis study aims to investigate the mechanical and tribological behavior of 70Mn steel with different laser re-melted textured patterns.Design/methodology/approachLaser surface re-melting (LSR) was used to manufacture various textured patterns (i.e. line, grid and mixed) on both the original and heat-treated 70Mn steel plates. The micro-hardness, microstructure, tensile strength, yield strength, elongation, coefficients of friction (COF) and worn morphologies were characterized to evaluate the impact of different textured patterns on the overall performance.FindingsThe results show that re-melted unit exhibited the highest surface hardness on the subsurface. The increase in surface hardness of the re-melted unit for the heat-treated 70Mn steel samples was much lower than that of the original ones. The re-melted textured patterns did not improve the tensile strength, yield strength and elongation of either original or heat-treated 70Mn steel samples. The re-melted textured patterns effectively reduced the average COFs of heat-treated 70Mn steel samples, but increased friction of the non-heat-treated samples.Originality/valueThis study provides valuable insights into enhancing the mechanical properties and tribological characteristics of 70Mn steel, particularly in the automotive, heavy machinery and high-load application sectors. These industries have stringent requirements for durability and friction control, and the findings of this research are expected to effectively extend the lifespan of mechanical components.Peer reviewThe peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-11-2024-0443/