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Modeling microstructure evolution in a martensitic stainless steel subjected to hot working using a physically based model
Dalarna University, School of Technology and Business Studies, Materials Technology. KTH Royal Institute of Technology.ORCID iD: 0000-0002-3812-5285
Dalarna University, School of Technology and Business Studies, Materials Technology.
KTH Royal Institute of Technology.
2019 (English)In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 50, no 3, p. 1480-1488Article in journal (Refereed) Published
Abstract [en]

The microstructure evolution of a martensitic Stainless steel subjected to hot compression is simulated with a physically based model. The model is based on coupled sets of evolution equations for dislocations, vacancies, recrystallization and grain growth. The advantage of this model is that with only a few experiments, the material dependent parameters of the model can be calibrated and used for a new alloy in any deformation condition. The experimental data of this work is obtained from a series of hot compression, and subsequent stress relaxation tests performed in a Gleeble thermo-mechanical simulator. These tests are carried out at various temperatures ranging from 900 to 1200⁰C, strains up to 0.7 and strain rates of 0.01, 1 and 10 s-1. The grain growth, flow stress, and stress relaxations are simulated by finding reasonable values for model parameters. The flow stress data obtained at the strain rate of 10 s-1 were used to calibrate the model parameters and the predictions of the model for the lower strain rates were quite satisfactory. An assumption in the model is that the structure of second phase particles does not change during the short time of deformation. The results show a satisfactory agreement between the experimental data and simulated flow stress, as well as less than 5% difference for grain growth simulations and predicting the dominant softening mechanisms during stress relaxation according to the strain rates and temperatures under deformation.

Place, publisher, year, edition, pages
2019. Vol. 50, no 3, p. 1480-1488
Keywords [en]
Modeling, Dislocation density, Flow Stress, Grain Growth, Recrystallization, Hot Compression, Martensitic Stainless Steel
National Category
Metallurgy and Metallic Materials Manufacturing, Surface and Joining Technology
Research subject
Steel Forming and Surface Engineering
Identifiers
URN: urn:nbn:se:du-29041DOI: 10.1007/s11661-018-5073-6ISI: 000457551800036Scopus ID: 2-s2.0-85058849719OAI: oai:DiVA.org:du-29041DiVA, id: diva2:1269459
Available from: 2018-12-10 Created: 2018-12-10 Last updated: 2019-03-05Bibliographically approved

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Safara Nosar, NimaEngberg, Göran

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