期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2015.06.093
关键词
Flow stress formulation; Dynamic recrystallisation; 3D processing maps; Superalloy IN718
类别
资金
- Engineering and Physical Science Research Council of UK [EP/L02084X/1]
- Marie Curie International Incoming Fellowship [628,055, 913,055]
- International Research Staff Exchange Scheme (IRSES) within the 7th European Community Framework Programme (FP7) [318,968]
- National Natural Science Foundation of China [51375306]
- National Basic Research Program of China [2011CB012903]
- National Science and Technology Major Project [2011ZX04014-011]
- EPSRC [EP/L02084X/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/L02084X/1] Funding Source: researchfish
This study focuses on deformation characteristics of superalloy IN718 by formulation of a new flow stress model and detailed evaluation of intrinsic workability through the generation of three-dimensional (3D) processing maps with the support of optical microstructural observations. Based on thermomechanical simulation tests using a Gleeble-1500 machine, the flow stress model for superalloy IN718 was built and the flow stress throughout the entire deformation process was described by a peak stress only depending on Zener-Hollomon parameter and strain. The developed model exhibited the strain softening due to dynamic recrystallisation (DRX). The intrinsic workability was further investigated by constructing 3D processing maps. The 3D processing maps described the variations of the efficiency of power dissipation and flow instability domains as a function of strain rate, temperature and strain, from which the favourite deformation conditions for thermomechanical processing of IN718 can be established. (C) 2015 The Authors. Published by Elsevier B.V.
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