Modeling of unavoidable residual stresses after transformation - free cooling

Landek, Darko and Lisjak, Dragutin and Lübben, Thomas and Frerichs, Friedhelm (2013) Modeling of unavoidable residual stresses after transformation - free cooling. = Modeling of unavoidable residual stresses after transformation - free cooling. In: The 2nd mediterranean conference & new challenges on heat treatment and surface engineering, 11-14.06.2013., Dubrovnik- Cavtat, Hrvatska.

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Predicting thermal distortions and residual thermal stresses after steel heat treatment from computer simulations is a complex task that involves use a number of process parameters and nonlinear variation of steel properties. Previous studies cooling cylinders without the occurrence of phase transformations in the microstructure indicated the possibility of introducing the dimensionless numbers to predict changes in their dimensions. It was found that the changes in the dimensions of cylinders statistically correlate well with only a few dimensionless numbers that include: shape and dimensions of component, its initial temperature, temperature of the quenching media, heat transfer coefficient, heat conductivity, heat capacity, density, thermal expansion coefficient, Young´s modulus, Poisson´s ratio, yield strength and strain hardening behaviour. The next step in researches is carried out through on a set of numerical simulations with aim to predict the changes of residual stresses of austenitic stainless steels after cooling from the high temperature down to the room temperature. The proposed nonlinear regression model predicts equivalent residual stresses in vicinity of the surface in the half length of long cylinders from a set of autonomous dimensionless numbers.

Item Type: Conference or Workshop Item (Lecture)
Keywords (Croatian): thermal strains, residual stresses, dimensionless numbers, austenitic steel
Subjects: TECHNICAL SCIENCE > Mechanical Engineering
Divisions: 1000 Department of Materials > 1020 Chair of Heat Treatment and Surface Engineering
700 Department of Industrial Engineering > 720 Chair of Production Control
Indexed in Web of Science: No
Indexed in Current Contents: No
Date Deposited: 21 Sep 2016 12:35
Last Modified: 19 Feb 2018 14:36

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