Influence of the phase transformation behaviour on the microstructure and mechanical properties of a 4.5 wt.-% Mn Q&P steel

S. Kaar, R. Schneider, D. Krizan, C. Béal, C. Sommitsch

Research output: Contribution to specialist publicationArticleResearchpeer-review

Abstract

“Quenching and Partitioning” (Q&P) steels have a microstructure consisting of a tempered martensitic matrix with austenite islands, which can be stabilized to room temperature due to the C partitioning from martensite to the remaining austenite. This heat-treatment is a novel approach for producing ultra-high strength and good formable steels. In the present work the impact of the Q&P processing parameters on the phase transformation behavior and mechanical properties of a 4.5 wt.% Mn steel was investigated. Using dilatometry the influence of the quenching temperature (TQ) on the amount of martensite and the kinetics of the bainitic transformation was thoroughly studied. The microstructure was characterized by means of light optical and scanning electron microscopy. The amount of retained austenite was determined using the saturation magnetization measurement. In order to obtain the mechanical properties hardness measurements according to Vickers were performed. Furthermore, using tensile tests the Q&P concept was compared to the Quenching and Tempering (Q&T) process in terms of strength-ductility performance.

Translated title of the contributionInfluence of the phase transformation behaviour on the microstructure and mechanical properties of a 4.5 wt.-% Mn Q&P steel
Original languageGerman
Pages70-84
Number of pages15
Volume74
No.2
Specialist publicationHTM - journal of heat treatment and materials
DOIs
Publication statusPublished - 1 Apr 2019

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Steel
Austenite
Quenching
Phase transitions
Martensite
Mechanical properties
Microstructure
Bainitic transformations
Tempering
Saturation magnetization
Ductility
Hardness
Heat treatment
Temperature
Scanning electron microscopy
Kinetics
Processing

Keywords

    ASJC Scopus subject areas

    • Industrial and Manufacturing Engineering
    • Metals and Alloys
    • Materials Chemistry

    Cite this

    Einfluss des Umwandlungsverhaltens auf das Gefüge und die mechanischen Eigenschaften eines Q&P-Stahls mit 4,5 % Mn. / Kaar, S.; Schneider, R.; Krizan, D.; Béal, C.; Sommitsch, C.

    In: HTM - journal of heat treatment and materials, Vol. 74, No. 2, 01.04.2019, p. 70-84.

    Research output: Contribution to specialist publicationArticleResearchpeer-review

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    abstract = "“Quenching and Partitioning” (Q&P) steels have a microstructure consisting of a tempered martensitic matrix with austenite islands, which can be stabilized to room temperature due to the C partitioning from martensite to the remaining austenite. This heat-treatment is a novel approach for producing ultra-high strength and good formable steels. In the present work the impact of the Q&P processing parameters on the phase transformation behavior and mechanical properties of a 4.5 wt.{\%} Mn steel was investigated. Using dilatometry the influence of the quenching temperature (TQ) on the amount of martensite and the kinetics of the bainitic transformation was thoroughly studied. The microstructure was characterized by means of light optical and scanning electron microscopy. The amount of retained austenite was determined using the saturation magnetization measurement. In order to obtain the mechanical properties hardness measurements according to Vickers were performed. Furthermore, using tensile tests the Q&P concept was compared to the Quenching and Tempering (Q&T) process in terms of strength-ductility performance.",
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