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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/12725
Title: Effect of Cooling Rate and Chemical Composition on Microstructure and Properties of Naturally Cooled Vanadium-Microalloyed Steels
Authors: Karmakar A.
Sahu P.
Neogy S.
Chakrabarti D.
Mitra R.
Mukherjee S.
Kundu S.
Published in: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Abstract: Samples from two V-microalloyed steels (0.05 wt pct V) having different C and N levels, namely high-C low-N steel, HCLN (0.22 wt pct C, 0.007 wt pct N) and low-C high-N steel, LCHN (0.06 wt pct C, 0.013 wt pct N) were naturally cooled from 1373 K (1100 °C) to room temperature over a range of cooling rates (0.07 to 3.33 K/s). Samples from a plain C-Mn steel (0.06 wt pct C, 0.007 wt pct N) were also subjected to the same heat treatment for comparison. The effect of cooling rate and steel composition on microstructures, precipitates, and tensile properties has been investigated. Due to the presence of large fraction of harder constituents, like pearlite and bainite, HCLN steel showed higher strength and lower ductility than LCHN steel. LCHN steel, on the other hand, showed good combination of strength and ductility due to its predominantly ferrite matrix with precipitation strengthening. The V-precipitate size was more refined and the precipitate density was higher in HCLN steel than that in LCHN steel. This observation confirms the importance of C content in V-microalloyed steel in terms of precipitation strengthening. An intermediate cooling rate (~1.4 K/s) has been found to be the optimum choice in order to maximize the precipitation strengthening in V-containing steels. © 2017, The Minerals, Metals & Materials Society and ASM International.
Citation: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science (2017), 48(4): 1581-1595
URI: https://doi.org/10.1007/s11661-017-3964-6
http://repository.iitr.ac.in/handle/123456789/12725
Issue Date: 2017
Publisher: Springer Boston
ISSN: 10735623
Author Scopus IDs: 55510104200
57205520445
8290723200
12792743400
56225235900
57205520323
23009089000
Author Affiliations: Karmakar, A., Department of Metallurgical and Materials Engineering, IIT Kharagpur, Kharagpur, West Bengal 721-302, India
Sahu, P., Department of Metallurgical and Materials Engineering, IIT Kharagpur, Kharagpur, West Bengal 721-302, India, CSIR-Institute of Minerals and Materials Technology, Bhubaneswar, Odisha 751-013, India
Neogy, S., Materials Science Division, Bhabha Atomic Research Centre (BARC), Mumbai, Maharashtra 400-085, India
Chakrabarti, D., Department of Metallurgical and Materials Engineering, IIT Kharagpur, Kharagpur, West Bengal 721-302, India
Mitra, R., Department of Metallurgical and Materials Engineering, IIT Kharagpur, Kharagpur, West Bengal 721-302, India
Mukherjee, S., Product Research Group, Research and Development, Tata Steel, Jamshedpur, Jharkhand 831-001, India
Kundu, S., Product Research Group, Research and Development, Tata Steel, Jamshedpur, Jharkhand 831-001, India
Corresponding Author: Karmakar, A.; Department of Metallurgical and Materials Engineering, IIT KharagpurIndia; email: anish.met@gmail.com
Appears in Collections:Journal Publications [MT]

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