A comparison of cross-tension properties and fracture behavior between similar and dissimilar resistance spot-weldments in medium-Mn TRIP steel

Gitae Park, Kwangjoong Kim, Sangho Uhm, Changhee Lee

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The current study characterizes the degradation of cross-tension properties in medium-Mn transformation-induced plasticity (TRIP) steel weldments by comparison of fracture behaviors in both similar and dissimilar weldments with DP980 dual phase steel. The experimental results reveal that the cross-tension strengths of medium-Mn TRIP steel weldments is inferior to those of conventional TRIP steel having lower carbon equivalent. Although the failure modes of similar and dissimilar weldments were different from each other, the brittleness of the martensite was a common key factor governing crack propagation. In similar weldment, the decreased tensile toughness in the coarse grain heat-affected zone due to the insufficient self-tempering of martensite and the decreased retained austenite fraction. Meanwhile, understanding the changes in the carbon equivalent caused by dilution in the dissimilar welds and segregation in the fusion zone is necessary to characterize medium-Mn TRIP steel spot welds.

Original languageEnglish
Pages (from-to)206-216
Number of pages11
JournalMaterials Science and Engineering A
Volume752
DOIs
StatePublished - 2019 Apr 3

Fingerprint

Steel
plastic properties
Plasticity
steels
martensite
Martensite
Welds
spot welds
brittleness
low carbon steels
heat affected zone
tempering
failure modes
Low carbon steel
crack propagation
Tempering
Heat affected zone
toughness
Brittleness
austenite

Keywords

  • Failure mode
  • Fractography
  • Mechanical properties
  • Medium-Mn steel
  • Resistance spot welding

Cite this

@article{ccf9cb9d14444ddbad43ca45bcb6485f,
title = "A comparison of cross-tension properties and fracture behavior between similar and dissimilar resistance spot-weldments in medium-Mn TRIP steel",
abstract = "The current study characterizes the degradation of cross-tension properties in medium-Mn transformation-induced plasticity (TRIP) steel weldments by comparison of fracture behaviors in both similar and dissimilar weldments with DP980 dual phase steel. The experimental results reveal that the cross-tension strengths of medium-Mn TRIP steel weldments is inferior to those of conventional TRIP steel having lower carbon equivalent. Although the failure modes of similar and dissimilar weldments were different from each other, the brittleness of the martensite was a common key factor governing crack propagation. In similar weldment, the decreased tensile toughness in the coarse grain heat-affected zone due to the insufficient self-tempering of martensite and the decreased retained austenite fraction. Meanwhile, understanding the changes in the carbon equivalent caused by dilution in the dissimilar welds and segregation in the fusion zone is necessary to characterize medium-Mn TRIP steel spot welds.",
keywords = "Failure mode, Fractography, Mechanical properties, Medium-Mn steel, Resistance spot welding",
author = "Gitae Park and Kwangjoong Kim and Sangho Uhm and Changhee Lee",
year = "2019",
month = "4",
day = "3",
doi = "10.1016/j.msea.2019.03.023",
language = "English",
volume = "752",
pages = "206--216",
journal = "Materials Science and Engineering A",
issn = "0921-5093",

}

A comparison of cross-tension properties and fracture behavior between similar and dissimilar resistance spot-weldments in medium-Mn TRIP steel. / Park, Gitae; Kim, Kwangjoong; Uhm, Sangho; Lee, Changhee.

In: Materials Science and Engineering A, Vol. 752, 03.04.2019, p. 206-216.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - A comparison of cross-tension properties and fracture behavior between similar and dissimilar resistance spot-weldments in medium-Mn TRIP steel

AU - Park, Gitae

AU - Kim, Kwangjoong

AU - Uhm, Sangho

AU - Lee, Changhee

PY - 2019/4/3

Y1 - 2019/4/3

N2 - The current study characterizes the degradation of cross-tension properties in medium-Mn transformation-induced plasticity (TRIP) steel weldments by comparison of fracture behaviors in both similar and dissimilar weldments with DP980 dual phase steel. The experimental results reveal that the cross-tension strengths of medium-Mn TRIP steel weldments is inferior to those of conventional TRIP steel having lower carbon equivalent. Although the failure modes of similar and dissimilar weldments were different from each other, the brittleness of the martensite was a common key factor governing crack propagation. In similar weldment, the decreased tensile toughness in the coarse grain heat-affected zone due to the insufficient self-tempering of martensite and the decreased retained austenite fraction. Meanwhile, understanding the changes in the carbon equivalent caused by dilution in the dissimilar welds and segregation in the fusion zone is necessary to characterize medium-Mn TRIP steel spot welds.

AB - The current study characterizes the degradation of cross-tension properties in medium-Mn transformation-induced plasticity (TRIP) steel weldments by comparison of fracture behaviors in both similar and dissimilar weldments with DP980 dual phase steel. The experimental results reveal that the cross-tension strengths of medium-Mn TRIP steel weldments is inferior to those of conventional TRIP steel having lower carbon equivalent. Although the failure modes of similar and dissimilar weldments were different from each other, the brittleness of the martensite was a common key factor governing crack propagation. In similar weldment, the decreased tensile toughness in the coarse grain heat-affected zone due to the insufficient self-tempering of martensite and the decreased retained austenite fraction. Meanwhile, understanding the changes in the carbon equivalent caused by dilution in the dissimilar welds and segregation in the fusion zone is necessary to characterize medium-Mn TRIP steel spot welds.

KW - Failure mode

KW - Fractography

KW - Mechanical properties

KW - Medium-Mn steel

KW - Resistance spot welding

UR - http://www.scopus.com/inward/record.url?scp=85062707548&partnerID=8YFLogxK

U2 - 10.1016/j.msea.2019.03.023

DO - 10.1016/j.msea.2019.03.023

M3 - Article

VL - 752

SP - 206

EP - 216

JO - Materials Science and Engineering A

JF - Materials Science and Engineering A

SN - 0921-5093

ER -