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

Olli Oja; Ari Saastamoinen; Madan Patnamsetty; Mari Honkanen; Pasi Peura; Martti Järvenpää

doi:10.3390/met9080887

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

Olli Oja, Ari Saastamoinen, Madan Patnamsetty, Mari Honkanen, Pasi Peura, Martti Järvenpää

Materials Science and Environmental Engineering

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Abstract

The intercritical annealing and isothermal bainitic processing response was studied for three Nb and V microalloyed 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.

Original language	English
Article number	887
Number of pages	14
Journal	Metals
Volume	9
Issue number	8
DOIs	https://doi.org/10.3390/met9080887
Publication status	Published - 14 Aug 2019
Publication type	A1 Journal article-refereed

Keywords

steel
martensite
austenite
microalloying
dilatometry
true fracture strain
TRIP

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metals-09-00887Final published version, 8.52 MBLicence: CC BY

http://urn.fi/URN:NBN:fi:tuni-201909203434Licence: CC BY

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abstract = "The intercritical annealing and isothermal bainitic processing response was studied for three Nb and V microalloyed 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.",

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AU - Oja, Olli

AU - Saastamoinen, Ari

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AU - Honkanen, Mari

AU - Peura, Pasi

AU - Järvenpää, Martti

N1 - EXT="Oja, Olli"

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N2 - The intercritical annealing and isothermal bainitic processing response was studied for three Nb and V microalloyed 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.

AB - The intercritical annealing and isothermal bainitic processing response was studied for three Nb and V microalloyed 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.

KW - steel

KW - martensite

KW - austenite

KW - microalloying

KW - dilatometry

KW - true fracture strain

KW - TRIP

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DO - 10.3390/met9080887

M3 - Article

VL - 9

IS - 8

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ER -

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

Abstract

Keywords

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