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 ? 40 ? 160 mm in size were used whereas in modelling specimens of the same diameter, i.e., ? 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.
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