Repository logo

Infoscience

  • English
  • French
Log In
Logo EPFL, École polytechnique fédérale de Lausanne

Infoscience

  • English
  • French
Log In
  1. Home
  2. Academic and Research Output
  3. Journal articles
  4. Effect of cooling conditions on microstructures and mechanical behaviors of reheated low-carbon weld metals
 
research article

Effect of cooling conditions on microstructures and mechanical behaviors of reheated low-carbon weld metals

Mao, Gaojun
•
Cao, Rui
•
Cayron, Cyril  
Show more
January 28, 2019
Materials Science And Engineering A-Structural Materials Properties Microstructure And Processing

An investigation was conducted to systematically explore the relationships among microstructure evolution, continuous cooling transformation kinetics, and mechanical properties development in a low-carbon reheated weld metal (0.052C-1.5Mn-0.3Si-0.7Cr-0.8Mo-0.014Ti-0.004V-4Ni, wt%). Microstructure was characterized by optical microscopy, scanning electron microscopy and electron backscattered diffraction techniques. The effect of different cooling rates on morphologic features and crystallographic characteristics (i.e., orientation relationship, variant selection) of various microstructures was researched. Transformation kinetics at various cooling rates were studied on the basis of the dilatometric data using a Gleeble simulator. Impact energy at 223 K, ultimate tensile strength at room temperature, and microhardness were tested. Present results were compared with previously published literature. It is shown that the primary microstructure varies from martensite, to a mixture of martensite and lath bainite, to a mixture of lath bainite and acicular ferrite, and to complete granular bainite with decreasing cooling rates from water quenching, to 30 K/s, to 10 K/s, to 3 K/s, and to 0.3 K/s, respectively, which was also accompanied by a decrease in Vickers microhardness. The best combination of toughness and strength in specimens with microstructures was made up of lath bainite and acicular ferrite obtained with the cooling rates of 10 K/s and 3 K/s.

  • Details
  • Metrics
Type
research article
DOI
10.1016/j.msea.2018.12.035
Web of Science ID

WOS:000457510300070

Author(s)
Mao, Gaojun
Cao, Rui
Cayron, Cyril  
Mao, Xiuli
Loge, Roland  
Chen, Jianhong
Date Issued

2019-01-28

Publisher

ELSEVIER SCIENCE SA

Published in
Materials Science And Engineering A-Structural Materials Properties Microstructure And Processing
Volume

744

Start page

671

End page

681

Subjects

Nanoscience & Nanotechnology

•

Materials Science, Multidisciplinary

•

Metallurgy & Metallurgical Engineering

•

Science & Technology - Other Topics

•

Materials Science

•

Metallurgy & Metallurgical Engineering

•

low-carbon reheated weld metal

•

martensite

•

bainite

•

crystallography

•

kinetics

•

mechanical properties

•

acicular ferrite

•

high-strength

•

bainite transformation

•

lath martensite

•

phase-transformations

•

variant selection

•

silicon steels

•

crystallography

•

nucleation

•

morphology

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LMTM  
Available on Infoscience
June 18, 2019
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/157472
Logo EPFL, École polytechnique fédérale de Lausanne
  • Contact
  • infoscience@epfl.ch

  • Follow us on Facebook
  • Follow us on Instagram
  • Follow us on LinkedIn
  • Follow us on X
  • Follow us on Youtube
AccessibilityLegal noticePrivacy policyCookie settingsEnd User AgreementGet helpFeedback

Infoscience is a service managed and provided by the Library and IT Services of EPFL. © EPFL, tous droits réservés