Microstructure and tensile behavior of friction-stir welded TRIP steel

S. Mironov; Y. S. Sato; S. Yoneyama; Hiroyuki Kokawa; Hiromichi Fujii; S. Hirano

doi:10.1016/j.msea.2018.01.053

Microstructure and tensile behavior of friction-stir welded TRIP steel

S. Mironov, Y. S. Sato, S. Yoneyama, Hiroyuki Kokawa, Hiromichi Fujii, S. Hirano

ENG - Materials Processing

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

28 Citations (Scopus)

Abstract

In this work, electron backscatter diffraction and digital image correlation techniques were employed to study the microstructure and microstructure-property relationship in friction-stir welded TRIP steel. It was found that the thermal effect of the welding process led to material softening in the heat-affected zone and promoted martensite transformation in the stir zone. These microstructural changes provided rapid strain localization during subsequent transverse tensile tests and thus resulted in premature failure of the welds. Material softening in the heat-affected zone was deduced to be a combined result of dissolution and spheroidisation of retained austenite as well as recovery in bainitic ferrite. The stir zone martensite was characterized by significant orientation spread and therefore its orientation relationship with austenite essentially deviated from the ideal Kurdjumov-Sachs relation. Moreover, the martensite transformation was found to be influenced by variant selection.

Original language	English
Pages (from-to)	26-33
Number of pages	8
Journal	Materials Science and Engineering A
Volume	717
DOIs	https://doi.org/10.1016/j.msea.2018.01.053
Publication status	Published - 2018 Feb 21

Keywords

Characterization
Electron microscopy
Iron alloys
Phase transformations
Plasticity methods
Stress/strain measurements

ASJC Scopus subject areas

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

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10.1016/j.msea.2018.01.053

Cite this

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title = "Microstructure and tensile behavior of friction-stir welded TRIP steel",

abstract = "In this work, electron backscatter diffraction and digital image correlation techniques were employed to study the microstructure and microstructure-property relationship in friction-stir welded TRIP steel. It was found that the thermal effect of the welding process led to material softening in the heat-affected zone and promoted martensite transformation in the stir zone. These microstructural changes provided rapid strain localization during subsequent transverse tensile tests and thus resulted in premature failure of the welds. Material softening in the heat-affected zone was deduced to be a combined result of dissolution and spheroidisation of retained austenite as well as recovery in bainitic ferrite. The stir zone martensite was characterized by significant orientation spread and therefore its orientation relationship with austenite essentially deviated from the ideal Kurdjumov-Sachs relation. Moreover, the martensite transformation was found to be influenced by variant selection.",

keywords = "Characterization, Electron microscopy, Iron alloys, Phase transformations, Plasticity methods, Stress/strain measurements",

author = "S. Mironov and Sato, {Y. S.} and S. Yoneyama and Hiroyuki Kokawa and Hiromichi Fujii and S. Hirano",

note = "Funding Information: The authors are grateful to Dr. K. Kobayashi, Mr. H. Furuya, Mr. H. Honda, and Mr. S. Yamamoto for technical assistance. One of the authors (S. Mironov) would like to express his hearty thanks to Tohoku University for providing a scientific fellowship. This paper was partially based on results obtained from a future pioneering project commissioned by the New Energy and Industrial Technology Development Organization (NEDO) which is co-research with Innovative Structural Materials Association (ISMA) (Project code: P14014). Appendix A Publisher Copyright: {\textcopyright} 2018 Elsevier B.V.",

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doi = "10.1016/j.msea.2018.01.053",

language = "English",

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T1 - Microstructure and tensile behavior of friction-stir welded TRIP steel

AU - Mironov, S.

AU - Sato, Y. S.

AU - Yoneyama, S.

AU - Kokawa, Hiroyuki

AU - Fujii, Hiromichi

AU - Hirano, S.

N1 - Funding Information: The authors are grateful to Dr. K. Kobayashi, Mr. H. Furuya, Mr. H. Honda, and Mr. S. Yamamoto for technical assistance. One of the authors (S. Mironov) would like to express his hearty thanks to Tohoku University for providing a scientific fellowship. This paper was partially based on results obtained from a future pioneering project commissioned by the New Energy and Industrial Technology Development Organization (NEDO) which is co-research with Innovative Structural Materials Association (ISMA) (Project code: P14014). Appendix A Publisher Copyright: © 2018 Elsevier B.V.

PY - 2018/2/21

Y1 - 2018/2/21

N2 - In this work, electron backscatter diffraction and digital image correlation techniques were employed to study the microstructure and microstructure-property relationship in friction-stir welded TRIP steel. It was found that the thermal effect of the welding process led to material softening in the heat-affected zone and promoted martensite transformation in the stir zone. These microstructural changes provided rapid strain localization during subsequent transverse tensile tests and thus resulted in premature failure of the welds. Material softening in the heat-affected zone was deduced to be a combined result of dissolution and spheroidisation of retained austenite as well as recovery in bainitic ferrite. The stir zone martensite was characterized by significant orientation spread and therefore its orientation relationship with austenite essentially deviated from the ideal Kurdjumov-Sachs relation. Moreover, the martensite transformation was found to be influenced by variant selection.

AB - In this work, electron backscatter diffraction and digital image correlation techniques were employed to study the microstructure and microstructure-property relationship in friction-stir welded TRIP steel. It was found that the thermal effect of the welding process led to material softening in the heat-affected zone and promoted martensite transformation in the stir zone. These microstructural changes provided rapid strain localization during subsequent transverse tensile tests and thus resulted in premature failure of the welds. Material softening in the heat-affected zone was deduced to be a combined result of dissolution and spheroidisation of retained austenite as well as recovery in bainitic ferrite. The stir zone martensite was characterized by significant orientation spread and therefore its orientation relationship with austenite essentially deviated from the ideal Kurdjumov-Sachs relation. Moreover, the martensite transformation was found to be influenced by variant selection.

KW - Characterization

KW - Electron microscopy

KW - Iron alloys

KW - Phase transformations

KW - Plasticity methods

KW - Stress/strain measurements

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SN - 0921-5093

ER -

Microstructure and tensile behavior of friction-stir welded TRIP steel

Abstract

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