Mechanism Based Flow Stress Model for Alloy 625 and Alloy 718
1
Division of Mechanics of Solid Materials, Luleå University of Technology, SE-971 87 Luleå, Sweden
2
Department of Materials Science and Applied Mathematics, Malmö University, SE-205 06 Malmö, Sweden
3
Division of Solid Mechanics, Lund University, P.O. Box 118, SE-221 00 Lund, Sweden
*
Author to whom correspondence should be addressed.
Materials 2020, 13(24), 5620; https://doi.org/10.3390/ma13245620
Received: 20 October 2020
/
Revised: 24 November 2020
/
Accepted: 7 December 2020
/
Published: 9 December 2020
To predict the final geometry in thermo-mechanical processes, the use of modeling tools is of great importance. One important part of the modeling process is to describe the response correctly. A previously published mechanism-based flow stress model has been further developed and adapted for the nickel-based superalloys, alloy 625, and alloy 718. The updates include the implementation of a solid solution strengthening model and a model for high temperature plasticity. This type of material model is appropriate in simulations of manufacturing processes where the material undergoes large variations in strain rates and temperatures. The model also inherently captures stress relaxation. The flow stress model has been calibrated using compression strain rate data ranging from 0.01 to 1 s−1 with a temperature span from room temperature up to near the melting temperature. Deformation mechanism maps are also constructed which shows when the different mechanisms are dominating. After the model has been calibrated, it is validated using stress relaxation tests. From the parameter optimization, it is seen that many of the parameters are very similar for alloy 625 and alloy 718, although it is two different materials. The modeled and measured stress relaxation are in good agreement.
View Full-Text
▼
Show Figures
Figure 1
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited
MDPI and ACS Style
Malmelöv, A.; Fisk, M.; Lundbäck, A.; Lindgren, L.-E. Mechanism Based Flow Stress Model for Alloy 625 and Alloy 718. Materials 2020, 13, 5620. https://doi.org/10.3390/ma13245620
AMA Style
Malmelöv A, Fisk M, Lundbäck A, Lindgren L-E. Mechanism Based Flow Stress Model for Alloy 625 and Alloy 718. Materials. 2020; 13(24):5620. https://doi.org/10.3390/ma13245620
Chicago/Turabian StyleMalmelöv, Andreas, Martin Fisk, Andreas Lundbäck, and Lars-Erik Lindgren. 2020. "Mechanism Based Flow Stress Model for Alloy 625 and Alloy 718" Materials 13, no. 24: 5620. https://doi.org/10.3390/ma13245620
Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.
