Effect of Si and Al on microstructure-property-relationship of Q&P-steels during galvannealing

M. Wallner; R. Schneider; K. Steineder; C. Sommitsch

doi:10.1080/02670836.2021.1882754

Effect of Si and Al on microstructure-property-relationship of Q&P-steels during galvannealing

M. Wallner^*, R. Schneider, K. Steineder, C. Sommitsch

^*Corresponding author for this work

Institute of Materials Science, Joining and Forming (3030)

Research output: Contribution to journal › Article › peer-review

Abstract

The influence of a thermal-treatment simulating a galvannealing-process (GA) on the microstructure of a 0.2C–4Mn–1.5Si and 0.2C–4Mn–1.5Al (in wt-%) medium-Mn-Q&P-steel was investigated in detail using dilatometry. After Q&P-process, the retained austenite (RA) fraction is higher and mechanical properties are superior for the Si-concept. Owing to galvannealing, strength decreases substantial for both concepts. For the Si-concept however, RA starts to decompose into pearlite upon galvannealing temperatures of 520°C, leading to a significant decrease in elongation. For the Al-concept, the RA-fraction remains constant up to 560°C, which even results in increased elongations values compared to the galvannealed Si concept. This contribution shows that Al as an alloy-element in Q&P-steel is more suitable for RA stabilisation at higher temperature than Si.

Original language	English
Pages (from-to)	182-189
Number of pages	8
Journal	Materials Science and Technology (United Kingdom)
Volume	37
Issue number	2
DOIs	https://doi.org/10.1080/02670836.2021.1882754
Publication status	Published - 2021

Keywords

austenite decomposition
carbide precipitation
galvannealing
martensite tempering
mechanical properties
Quenching & partitioning
retained austenite
thermal stability

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Access to Document

10.1080/02670836.2021.1882754

Cite this

@article{ce949c3cf14545718f736ec553e9e4cd,

title = "Effect of Si and Al on microstructure-property-relationship of Q&P-steels during galvannealing",

abstract = "The influence of a thermal-treatment simulating a galvannealing-process (GA) on the microstructure of a 0.2C–4Mn–1.5Si and 0.2C–4Mn–1.5Al (in wt-%) medium-Mn-Q&P-steel was investigated in detail using dilatometry. After Q&P-process, the retained austenite (RA) fraction is higher and mechanical properties are superior for the Si-concept. Owing to galvannealing, strength decreases substantial for both concepts. For the Si-concept however, RA starts to decompose into pearlite upon galvannealing temperatures of 520°C, leading to a significant decrease in elongation. For the Al-concept, the RA-fraction remains constant up to 560°C, which even results in increased elongations values compared to the galvannealed Si concept. This contribution shows that Al as an alloy-element in Q&P-steel is more suitable for RA stabilisation at higher temperature than Si.",

keywords = "austenite decomposition, carbide precipitation, galvannealing, martensite tempering, mechanical properties, Quenching & partitioning, retained austenite, thermal stability",

author = "M. Wallner and R. Schneider and K. Steineder and C. Sommitsch",

note = "Funding Information: The authors sincerely acknowledge the support of the Austrian Research Promotion Agency (FFG) related to the frontrunner project No. 860188 {\textquoteleft}Upscaling of medium Mn-TRIP steels{\textquoteright}. Publisher Copyright: {\textcopyright} 2021 Institute of Materials, Minerals and Mining.",

year = "2021",

doi = "10.1080/02670836.2021.1882754",

language = "English",

volume = "37",

pages = "182--189",

journal = "Materials Science and Technology",

issn = "0267-0836",

publisher = "Taylor & Francis Group",

number = "2",

}

TY - JOUR

T1 - Effect of Si and Al on microstructure-property-relationship of Q&P-steels during galvannealing

AU - Wallner, M.

AU - Schneider, R.

AU - Steineder, K.

AU - Sommitsch, C.

N1 - Funding Information: The authors sincerely acknowledge the support of the Austrian Research Promotion Agency (FFG) related to the frontrunner project No. 860188 ‘Upscaling of medium Mn-TRIP steels’. Publisher Copyright: © 2021 Institute of Materials, Minerals and Mining.

PY - 2021

Y1 - 2021

N2 - The influence of a thermal-treatment simulating a galvannealing-process (GA) on the microstructure of a 0.2C–4Mn–1.5Si and 0.2C–4Mn–1.5Al (in wt-%) medium-Mn-Q&P-steel was investigated in detail using dilatometry. After Q&P-process, the retained austenite (RA) fraction is higher and mechanical properties are superior for the Si-concept. Owing to galvannealing, strength decreases substantial for both concepts. For the Si-concept however, RA starts to decompose into pearlite upon galvannealing temperatures of 520°C, leading to a significant decrease in elongation. For the Al-concept, the RA-fraction remains constant up to 560°C, which even results in increased elongations values compared to the galvannealed Si concept. This contribution shows that Al as an alloy-element in Q&P-steel is more suitable for RA stabilisation at higher temperature than Si.

AB - The influence of a thermal-treatment simulating a galvannealing-process (GA) on the microstructure of a 0.2C–4Mn–1.5Si and 0.2C–4Mn–1.5Al (in wt-%) medium-Mn-Q&P-steel was investigated in detail using dilatometry. After Q&P-process, the retained austenite (RA) fraction is higher and mechanical properties are superior for the Si-concept. Owing to galvannealing, strength decreases substantial for both concepts. For the Si-concept however, RA starts to decompose into pearlite upon galvannealing temperatures of 520°C, leading to a significant decrease in elongation. For the Al-concept, the RA-fraction remains constant up to 560°C, which even results in increased elongations values compared to the galvannealed Si concept. This contribution shows that Al as an alloy-element in Q&P-steel is more suitable for RA stabilisation at higher temperature than Si.

KW - austenite decomposition

KW - carbide precipitation

KW - galvannealing

KW - martensite tempering

KW - mechanical properties

KW - Quenching & partitioning

KW - retained austenite

KW - thermal stability

UR - http://www.scopus.com/inward/record.url?scp=85101185984&partnerID=8YFLogxK

U2 - 10.1080/02670836.2021.1882754

DO - 10.1080/02670836.2021.1882754

M3 - Article

AN - SCOPUS:85101185984

VL - 37

SP - 182

EP - 189

JO - Materials Science and Technology

JF - Materials Science and Technology

SN - 0267-0836

IS - 2

ER -

Effect of Si and Al on microstructure-property-relationship of Q&P-steels during galvannealing

Abstract

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this