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The influence of laser hardening on wear in the valve and valve seat contact

Slatter, T., Taylor, H., Lewis, R. and King, P. (2009) The influence of laser hardening on wear in the valve and valve seat contact. Wear, 267 (5-8). pp. 797-806. ISSN 00431648

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Abstract

In internal combustion engines it is important to manage the wear in the valve and valve seat contact in order to minimise emissions and maximise economy. Traditionally wear in this contact has been controlled by the use of a valve seat insert and the careful selection of materials for both the valve and the insert. More recently, due to the increasing demands for both performance and cost, alternative methods of controlling the wear, and the resulting valve recession, have been sought. Using the heating effect of a laser to induce localised phase transformations, to increase hardness and wear resistance, in materials has been used since the 1970s, however it is only in recent years that it has been able to compete with more established surface treatment techniques, particularly in terms of cost, as new laser hardware has been developed. In this work, a laser has been used to treat the valve seat area of a cast iron cylinder head. In order to optimise the laser parameters for use on the head, preliminary tests were carried out to investigate the fundamental wear characteristics of untreated cast iron and also cast iron with a range of laser treatments. Previous work has identified the predominant wear mechanism in the valve and valve seat contact as impact on valve closure. Two bespoke test machines, one for testing basic specimens and one for testing components, were used to identify the laser parameters most likely to yield acceptable results when applied to a cylinder head to be used in a fired dynamometer test. © 2009 Elsevier B.V. All rights reserved.

Item Type: Article
Copyright, Publisher and Additional Information: © 2009 Elsevier B.V. This is an author produced version of a paper published in 'Wear'. Uploaded in accordance with the publisher's self-archiving policy.
Keywords: Hardening Laser Valve Wear Alternative methods Cast iron cylinder Cylinder head Heating effect Laser hardening Laser parameters Laser treatment Phase transformation Test machine Treatment techniques Valve closure Valve seat inserts Valve seats Wear characteristics Wear mechanisms Cast iron Cylinders (shapes) Internal combustion engines Lasers Metal casting Surface treatment Tribology Wear resistance
Institution: The University of Sheffield
Academic Units: The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Mechanical Engineering (Sheffield)
Depositing User: Mr Christopher Hardwick
Date Deposited: 13 Aug 2009 13:00
Last Modified: 08 Feb 2013 16:58
Published Version: http://dx.doi.org/10.1016/j.wear.2009.01.040
Status: Published
Publisher: Elsevier
Refereed: Yes
Identification Number: 10.1016/j.wear.2009.01.040
URI: http://eprints.whiterose.ac.uk/id/eprint/9083

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