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Open AccessArticle

Microstructure and Mechanical Properties of Nb and V Microalloyed TRIP-Assisted Steels

1
Product Development, SSAB Europe Oy, Harvialantie 420, 13300 Hämeenlinna, Finland
2
Materials Science and Environmental Engineering, Tampere University, Korkeakoulunkatu 6, Tampere University, 33720 Tampere, Finland
3
Tampere Microscopy Center, Tampere University, Korkeakoulunkatu 3, Tampere University, 33014 Tampere, Finland
*
Author to whom correspondence should be addressed.
Metals 2019, 9(8), 887; https://doi.org/10.3390/met9080887
Received: 30 June 2019 / Revised: 5 August 2019 / Accepted: 9 August 2019 / Published: 14 August 2019
(This article belongs to the Special Issue TRIP Steels)
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Abstract

The intercritical annealing and isothermal bainitic processing response was studied for three Nb and V microalloyed Transformation-Induced Plasticity (TRIP)-assisted 980 MPa grade steels. Their mechanical and microstructural properties were compared to industrially produced TRIP 800 steel. Depending on the isothermal holding temperature and microalloying, the experimental steels reached properties comparable to the reference steel. The retained austenite content did not show direct correlation to elongation properties. Niobium was found to be more effective microalloying element than vanadium in increasing the elongation properties, which were investigated by measuring true fracture strain from tensile test specimens. View Full-Text
Keywords: steel; martensite; austenite; microalloying; dilatometry; true fracture strain steel; martensite; austenite; microalloying; dilatometry; true fracture strain
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Oja, O.; Saastamoinen, A.; Patnamsetty, M.; Honkanen, M.; Peura, P.; Järvenpää, M. Microstructure and Mechanical Properties of Nb and V Microalloyed TRIP-Assisted Steels. Metals 2019, 9, 887.

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