Comparison of laser surface hardening ability between nodular cast iron and gray cast iron

doi:10.13251/j.issn.0254-6051.2024.12.037

Abstract

Abstract: Laserline-LDF3000 fiber-coupled semiconductor lase was used to harden the surface of nodular cast iron and gray cast iron. Effect of laser processing parameters on microstructure, depth and hardness of hardened layer was studied, and the hardening ability of the two types of cast irons was compared. The results show that at the same energy density, the hardened layer depth of the nodular cast iron is higher than that of the gray cast iron, and the depth of the hardened layer of the two types of cast irons with only slight melting on the surface is basically the same, around 0.8 mm. The main factors affecting the hardened layer depth of the tested cast irons are process parameters and material thermal conductivity. The hardened layer depth of the nodular cast iron has an approximate linear correlation with the energy density, but no linear relationship exists between them for gray cast iron because of its higher thermal conductivity. The surface hardness of the nodular cast iron (55-60 HRC) is higher than that of the gray cast iron (45-50 HRC) after laser hardening, and the influence of process parameters on the surface hardness is relatively small. The laser hardening ability of the nodular cast iron is higher than that of the gray cast iron.

Key words: laser surface hardening, nodular cast iron, gray cast iron, hardened layer depth, hardening ability

CLC Number:

TG163

Zhou Xianmin, Zeng Daxin, Yang Wei, Shi Qiuyue, Guo Dazhi. Comparison of laser surface hardening ability between nodular cast iron and gray cast iron[J]. Heat Treatment of Metals, 2024, 49(12): 229-236.

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