Studies on residual stress developed in laser surface irradiated 0.6% carbon steel

Majumdar, J. Dutta ; Nath, A. K. ; Kumar, B. Ravi ; Manna, I. (2004) Studies on residual stress developed in laser surface irradiated 0.6% carbon steel Lasers in Engineering, 14 (3-4). pp. 133-151. ISSN 0898-1507

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Laser surface hardening is a process of microstructural modification of the near surface region of iron-based component by inducing martensitic transformation with a high power laser beam as a source of heat. The process is aimed at introducing a hard and wear-resistant layer on the surface, thereby increasing the service life of the component. Due to a rapid rate of heating and cooling and a large thermal gradient associated with the process, a measurable amount of residual stress is developed in the laser irradiated region. In the present investigation, an attempt has been made to surface harden medium carbon steel (0.6% Carbon) using 2.5 kW continuous wave CO2 laser as a source of heat using Ar as shrouding gas. The microstructure and phase analysis of the irradiated region have been carried out in details. Residual stress developed in the laser-irradiated region has been carefully measured. Effect of laser parameters on microhardness and wear resistance has been studied. Finally, the processing zone for the surface hardening has been derived following a detailed structure-property correlation.

Item Type:Article
Source:Copyright of this article belongs to Old City Publishing, Inc..
Keywords:Laser; Hardening; Steel; Microhardness; Wear; Residual Stress
ID Code:18873
Deposited On:17 Nov 2010 12:30
Last Modified:17 May 2016 03:31

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