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The influence of laser re-melting on microstructure and hardness of gas-nitrided steel

Dominika Panfil / Piotr Wach / Michał Kulka / Jerzy Michalski
Published Online: 2016-12-30 | DOI: https://doi.org/10.1515/amtm-2016-0004


In this paper, modification of nitrided layer by laser re-melting was presented. The nitriding process has many advantageous properties. Controlled gas nitriding was carried out on 42CrMo4 steel. As a consequence of this process, ε+γ’ compound zone and diffusion zone were produced at the surface. Next, the nitrided layer was laser remelted using TRUMPF TLF 2600 Turbo CO2 laser. Laser tracks were arranged as single tracks with the use of various laser beam powers (P), ranging from 0.39 to 1.04 kW. The effects of laser beam power on the microstructure, dimensions of laser tracks and hardness profiles were analyzed. Laser treatment caused the decomposition of continuous compound zone at the surface and an increase in hardness of previously nitrided layer because of the appearance of martensite in re-melted and heat-affected zones

Keywords: Gas nitriding; Laser heat treatment; Microstruture; Hardness


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About the article

Received: 2016-02-02

Revised: 2016-05-04

Accepted: 2016-05-08

Published Online: 2016-12-30

Published in Print: 2016-12-01

Citation Information: Archives of Mechanical Technology and Materials, Volume 36, Issue 1, Pages 18–22, ISSN (Online) 2450-9469, DOI: https://doi.org/10.1515/amtm-2016-0004.

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© 2017. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License. BY-NC-ND 4.0

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