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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/12722
Title: Effect of composition and isothermal holding temperature on the precipitation hardening in Vanadium-microalloyed steels
Authors: Karmakar, Anish
Mukherjee S.
Kundu S.
Srivastava D.
Mitra R.
Chakrabarti D.
Published in: Materials Characterization
Abstract: The beneficial effect of increasing the C and N contents on precipitation strengthening in V-microalloyed steels is well known. However both C and N levels cannot be increased simultaneously as that can hamper the ductility and weldability of the steel. Therefore either higher C level or higher N level needs to be maintained. The present study is undertaken to understand the effect of C and N contents on the microstructure and precipitation in flat-rolled strips of V-microalloyed steels. During industrial processing, hot-rolled strips are subjected to a coiling treatment where V-precipitation primarily occurs. Therefore, besides steel composition, the effect of coiling temperature on the evolution of microstructure and precipitation in V-microalloyed steels needs to be studied. In order to achieve these objectives, two different V steels (0.05 wt% V), one having higher C and lower N content (HCLN steel) and the other having lower C and higher N content (LCHN steel) were prepared and subjected to hot-deformation followed by isothermal holding treatments over a temperature range of 500–750 °C inside Gleeble® thermo-mechanical simulator. The purpose of isothermal holding study was to simulate the industrial coiling treatment. Simulated samples were characterized in detail and the maximum precipitation strengthening from fine V(C,N) precipitates was obtained at an intermediate range of isothermal holding temperatures (600–650 °C) in both the steels. In spite of the relatively coarser ferrite grain size and smaller fraction of pearlite and bainite, the yield strength of LCHN steel was close to HCLN steel and LCHN steel also showed superior ductility. © 2017 Elsevier Inc.
Citation: Materials Characterization (2017), 132(): 31-40
URI: https://doi.org/10.1016/j.matchar.2017.08.003
http://repository.iitr.ac.in/handle/123456789/12722
Issue Date: 2017
Publisher: Elsevier Inc.
Keywords: Carbon content
Hardness
Isothermal holding
Nitrogen content
Precipitation strengthening
Tensile properties
Vanadium microalloyed steel
ISSN: 10445803
Author Scopus IDs: 55510104200
57205520323
23009089000
57196741375
56225235900
12792743400
Author Affiliations: Karmakar, A., Department of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal 721-302, India
Mukherjee, S., Product Research Group, Research and Development, Tata Steel, Jamshedpur, Jharkhand 831-001, India
Kundu, S., Research and Development, Tata Steel, Jamshedpur, Jharkhand 831-001, India
Srivastava, D., Mechanical Metallurgy Division, Bhabha Atomic Research Centre, Trombay, Mumbai, Maharashtra 400-085, India
Mitra, R., Department of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal 721-302, India
Chakrabarti, D., Department of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal 721-302, India
Funding Details: The authors duly acknowledge the financial support received from the Research & Development and Scientific Services Division of Tata Steel, Jamshedpur, experimental facilities offered by IIT Kharagpur and equipment grant provided by Sponsored Research and Industrial Consultancy, IIT Kharagpur through SGDRI scheme. Authors would also like to sincerely thank Mr. S. Neogy and Dr. G.K. Dey from the Materials Science Division of Bhabha Atomic Research Centre, Mumbai for their help and support in performing some experimental studies for this work.
Corresponding Author: Karmakar, A.; Department of Metallurgical and Materials Engineering, Indian Institute of Technology KharagpurIndia; email: 10mt70p03@iitkgp.ac.in
Appears in Collections:Journal Publications [MT]

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