Title: Measurement and numerical analysis of surface residual stresses occurring under different quenching conditions

Authors: Janez Grum, Tomaz Kek, Martin Zupancic, Milan Batista, Franc Kosel

Addresses: Faculty of Mechanical Engineering, University of Ljubljana, Askerceva 6, 1000 Ljubljana, Slovenia. ' Faculty of Mechanical Engineering, University of Ljubljana, Askerceva 6, 1000 Ljubljana, Slovenia. ' Faculty of Mechanical Engineering, University of Ljubljana, Askerceva 6, 1000 Ljubljana, Slovenia. ' Faculty of Mechanical Engineering, University of Ljubljana, Askerceva 6, 1000 Ljubljana, Slovenia. ' Faculty of Mechanical Engineering, University of Ljubljana, Askerceva 6, 1000 Ljubljana, Slovenia

Abstract: The paper presents the results of residual stresses modelling and experimental stress measurements after quenching of AISI 4140 heat-treatment steel specimens. In the research, cylindrical specimens of Ø 40 × 160 mm in size were used whereas in modelling specimens of the same diameter, i.e., Ø 40 mm, but of infinite length were employed. One quenching agent was selected, i.e., a 15% polymer water solution. The influence of residual stresses due to martensitic transformation and temperature differences was investigated with different initial specimen temperatures above and under TAC1. Two different temperatures were chosen in order to reveal the nature and quantitative properties of temperature- and transformational-induced residual stresses. Analytical work was made by mathematical modelling of heat treatment which supposes that the rheological model of a continuum is thermo-elasto-plastic material. Austenitic-martensitic transformations are described with Koistinen-Marburger equation. Related experimental measurements revealed relatively high temperature- and transformational-induced residual stresses, which were obtained with the hole drilling relaxation method.

Keywords: quenching; mathematical modelling; residual stress; surface stresses; stress measurements; heat treatment steel; martensitic transformation; temperature differences; austenitic-martensitic transformations; hole drilling relaxation.

DOI: 10.1504/IJMMP.2008.016946

International Journal of Microstructure and Materials Properties, 2008 Vol.3 No.1, pp.86 - 99

Available online: 31 Jan 2008 *

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