Microstructural characteristics of forged and heat treated Inconel-718 disks |
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| Affiliation: | 1. Département de Génie Mécanique, École de Technologie Supérieure, 1100 rue Notre-Dame Ouest, Montréal, Québec H3C 1K3, Canada;2. Department of Mechanical Engineering, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada;3. Life Prediction Technologies Inc., 23-1010 Polytek Street, Ottawa, Ontario K1J 9J1, Canada;1. State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, No. 28, Xianning West Road, Xi’an 710049, China;2. Xi''an Thermal Power Research Institute Co. Ltd., No. 136, Xingqing Road, Xi’an 710032, China;1. Universidad Autónoma de Nuevo León, Facultad de Ingeniería Mecánica y Eléctrica, Av. Universidad s/n, Cd. Universitaria, 66451 San Nicolás de los Garza, Nuevo León, Mexico;2. Departamento de Ciencia de los Materiales e Ingeniería Metalúrgica, Universitat Politècnica de Catalunya, Av. Eduard Maristany 10-14, 08019, Barcelona, Spain;1. Ecole de Technologie Superieure, Mechanical Engineering Department, Montreal, Canada;2. DCNS Research, DCNS, Nantes-Indret, France;3. Pratt & Whitney Canada, Special Process Development Group, Longueuil, Canada |
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| Abstract: | Microstructure evolution from center to edge of the as-forged and heat treated Inconel-718 disks was investigated. Specifically, the evolution of primary carbides, grain size, γ″, γ′, δ, and secondary carbide particles was the focus of the current study. In fact, characterization of these microstructure features is essential for models predicting the creep and fatigue lives of the alloy. Accurate and reliable revealing of the grain boundaries in as-forged and heat treated Inconel-718 was made possible in this study by development of a new method. From microstructure investigations, nonuniformities in grain size, volume fraction, size and inter particle spacing of precipitates from center to edge were observed in both as-forged and heat treated disks. The microstructure nonuniformities resulted in significant variation in hardness from center to edge of the disks. |
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| Keywords: | Nickel-base superalloy Forging Heat treatment Microstructure Hardness |
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