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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/13109
Title: Understanding hot workability and flow stress prediction through processing map with microstructural correlation for HY85 steel
Authors: Kumar S.
Rajput S.K.
Kumar N.
Nath S.K.
Published in: Materials Performance and Characterization
Abstract: In this study, the hot compression tests of HY85 steel have been experimented by using thermomechanical simulator Gleeble 3800 in hot compression temperature range of 750°C-1,100°C under strain rates between 0.001-10 s-1 up to true strain 0.7. It is worth noticing from the results that the flow stresses are dependent on the combination of temperature and strain rate. Adiabatic heating corrections of experimental flow stress data were carried out and were used to model stress-strain curves. The predictability of these stress-strain curves was confirmed from experimental results. True stress-true strain curves show the peak stresses followed by softening probability because of the existence of dynamic recrystallization (DRX). The apparent activation energy is calculated to be 360 KJ/mol using the sinh type constitutive equation, and it is observed that its value decreases with increasing strain. Hot compression of HY85 steel is controlled by dislocation climb and glide (n = 6.3). The processing maps are plotted based on different dynamic materials modeled with strain rate versus temperatures. The flow localization is one of the primary factors with resulting instability, which is revealed from the microstructure. Moreover, the partial DRX was noticed besides the grain boundaries and compression bands. Workability regions were identified using processing maps in the domain of strain rate and temperature and verified with microstructures. Copyright © 2019 by ASTM International.
Citation: Materials Performance and Characterization (2019), 9(2): -
URI: https://doi.org/10.1520/MPC20190013
http://repository.iitr.ac.in/handle/123456789/13109
Issue Date: 2019
Publisher: ASTM International
Keywords: High strength steel
Hot compression
Hot workability
Processing maps
ISSN: 21653992
Author Scopus IDs: 57209548009
55900876400
57203361065
7102759700
Author Affiliations: Kumar, S., Christian Doppler Laboratory for Interfaces and Precipitation Engineering (CDL-IPE), Institute of Materials Sciene and Techology, Techanical University of Wien, Getreidemarkt 9, Vienna, 1060, Austria
Rajput, S.K., Department of Mechanical Engineering, Bundelkhand Institute of Engineering and Technology, Jhansi, 284128, India
Kumar, N., Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Roorkee, 247667, India
Nath, S.K., Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Roorkee, 247667, India
Corresponding Author: Kumar, S.; Christian Doppler Laboratory for Interfaces and Precipitation Engineering (CDL-IPE), Institute of Materials Sciene and Techology, Techanical University of Wien, Getreidemarkt 9, Austria; email: rajputskmt@gmail.com
Appears in Collections:Journal Publications [MT]

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