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Three-Dimensional (3D) Microstructure-Based Modeling of a Thermally-Aged Cast Duplex Stainless Steel Based on X-ray Microtomography, Nanoindentation and Micropillar Compression

1
School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
2
Center for 4D Materials Science, Arizona State University, Tempe, AZ 85287, USA
3
State Key Laboratory of Non-ferrous Metals and Processes, General Research Institute for Nonferrous Metals, Beijing 100088, China
*
Authors to whom correspondence should be addressed.
Metals 2019, 9(6), 688; https://doi.org/10.3390/met9060688
Received: 1 May 2019 / Revised: 7 June 2019 / Accepted: 13 June 2019 / Published: 15 June 2019
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Abstract

Finite element analysis was conducted on a thermally-aged cast duplex stainless steel based on the true three-dimensional (3D) microstructure obtained from X-ray microtomography experiments and using the constitutive behavior of each individual phase extracted from nanoindentation on single-crystal and bicrystal micropillar compression tests. The evolution of the phase morphology, the mechanical properties and the boundary deformation behavior during the aging process are highlighted. Quantitative analysis in terms of the distribution and evolution of the stress and strain in both the as received and aged conditions was performed. The experimental results show that aging at an intermediate temperature has a negligible influence on the morphology of the two phases in cast duplex stainless steel (CDSS). Results from simulations reveal that the mechanical behavior of this material were seriously affected by the microstructure and the mechanical properties of the individual phase and the necking deformation tend to form in the area with less large ferrite grains after aging. In addition, stress localization tends to form at the austenite/ferrite interface, in the narrow region of ferrite grains and in the small ferrite grains. View Full-Text
Keywords: cast duplex stainless steel; thermal aging; finite element analysis; nanoindentation; micropillar compression; X-ray microtomography cast duplex stainless steel; thermal aging; finite element analysis; nanoindentation; micropillar compression; X-ray microtomography
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Zhang, Q.; Zhu, K.; Singaravelu, A.S.S.; Sun, W.; Jing, T.; Chawla, N. Three-Dimensional (3D) Microstructure-Based Modeling of a Thermally-Aged Cast Duplex Stainless Steel Based on X-ray Microtomography, Nanoindentation and Micropillar Compression. Metals 2019, 9, 688.

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