A new 1.9 GPa maraging stainless steel strengthened by multiple precipitating species |
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| Affiliation: | 1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;2. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;3. The Boeing Company, 7755 East Marginal Way South, Seattle, WA 98108, United States;1. Center for Advanced Structural Materials, Department of Mechanical and Biomedical Engineering, College of Science and Engineering, City University of Hong Kong, Hong Kong, People’s Republic of China;2. College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin, Heilongjiang 150001, People’s Republic of China;3. Oak Ridge National Laboratory, Oak Ridge, TN 37831-6139, USA;1. Department of Materials Science and Engineering, Northwestern University, 2220 Campus Drive, Evanston, IL 60208, USA;2. Northwestern University Center for Atom-Probe Tomography (NUCAPT), 2220 Campus Drive, Evanston, IL 60208, USA;1. Department of Materials Engineering, Ben-Gurion University of the Negev, P.O. Box 653, Beer-Sheva 84105, Israel;2. Nuclear Research Center-Negev, P.O. Box 9001, Beer-Sheva 84100, Israel;3. Ilse-Katz Institute for Nanoscale Science and Technology, Ben-Gurion University of the Negev, Beer-Sheva, Israel;1. Max-Planck-Institut für Eisenforschung GmbH, Department for Microstructure Physics and Alloy Design, Max-Planck-Str. 1, 40477 Düsseldorf, Germany;2. Max-Planck-Institut für Eisenforschung GmbH, Department for Computational Materials Design, Max-Planck-Str. 1, 40477 Düsseldorf, Germany;3. Universidad Simón Bolívar, Departamento de Ciencia de los Materiales, Valle de Sartenejas, Baruta 1086, Estado Miranda, Caracas, Venezuela;4. Peter Grünberg Institut and Institute of Advanced Simulation, Forschungszentrum Jülich and JARA, D-52425 Jülich, Germany;1. Center for Advanced Structural Materials, Department of Mechanical and Biomedical Engineering, College of Science and Engineering, City University of Hong Kong, Hong Kong, China;2. Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA;1. School of Materials Science and Engineering, Northeastern University, Shenyang 110004, China;2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;3. Shenyang National Laboratory for Materials Science, 72 Wenhua Road, Shenyang 110016, China;4. School of Metallurgy, Northeastern University, Shenyang 110004, China |
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| Abstract: | A new ultra-high strength maraging stainless steel with composition of 13Cr–13Co–4.5Ni–3.5Mo–0.5Ti (at.%) has been developed. It was demonstrated that the ultimate tensile strength of the steel could reach 1.9 GPa with reasonable ductility. This breakthrough was achieved by a combined strengthening of three different species of precipitates. The evolution of precipitates with respect of size, morphology and chemical composition during aging at 500 °C was characterized using atom probe tomography (APT) and transmission electron microscopy (TEM). The precipitates were identified to be η-phase Ni3(Ti, Al) phase, Mo-rich R′ phase and Cr-rich α′ phase, developing out of the precursor clusters, Ni–Ti–Al-rich cluster, Mo-rich cluster and Cr-rich cluster, separately. The segregation of Mo and Cr atoms at the precipitate/matrix interfaces was detected and is considered to impede the coarsening of η-phase. Based on the characterizations, the precipitation process of these phases and their effect on mechanical properties were analyzed. |
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| Keywords: | Maraging stainless steel Atom probe tomography Precipitates Strengthening |
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