Friction Stir welding of Ultrafine Grained TWIP Steel

Ueji, Rintaro; Fujii, Hidetoshi; Kunishige, Kazutoshi

Transactions of JWRI, 2015, 44(1), 27-30

Number of Access:463（2025-08-15 06:45 Counts）

Identifier to cite or link to this item: https://doi.org/10.18910/57261

Link to primary information 

File Format Terms of use Size Views Date.Available Description information
jwri44_1-027 pdf None 1.43 MB 198 2016.07.25  

Item Information

Output File Export EndNote Basic Export Mendeley

Title
Friction Stir welding of Ultrafine Grained TWIP Steel
Creator
NRID
1000080380145 1000080380145
CreatorName
Ueji, Rintaro
NRID
1000000247230 1000000247230
ORCID
0000-0002-5023-3844 0000-0002-5023-3844
researchmap permalink
read0051741 read0051741
Scopus Author ID
7403071460 7403071460
CreatorName
Fujii, Hidetoshi
CreatorName
Kunishige, Kazutoshi
Subject
Twinning induced plasticity
Steel
Friction stir welding
Microstucture
Ultrafine grain
Abstract
Microstructures and mechanical properties of ultrafine grained twinning induced plasticity (TWIP) steels, which were welded by both friction stir (FS) welding and conventional tungsten inert gas (TIG) welding, were studied. The ultrafine grained microstructure was successfully obtained by cold-rolling to a reduction in thickness of 88% and subsequent annealing at a warm temperature (620℃). Kikuchi line analysis in Transmission Electron Microscope (TEM) clarified that most of the grain boundaries in the annealed specimen are high angle grain boundaries whose misorientation angle is laｒger than 15°.The TIG welding of the ultrafine grained TWIP steel produces coarse grains whose mean grain size is 70 μm. on the other hand, the joint of the FS welded sample exhibits ultrafine grains with a high density of dislocations, and retains high hardness of the base metel. These results suggest that FS welding is an appropriate process for the joining of the ultrafine grained TWIP steels. The misrostructure evolution during the FSW was discussed with focus on the temperature dependence of the stacking fault energy of the TWIP steel. The tensile deformation of the parts of these joints were also examined at room temperature.
Publisher
大阪大学接合科学研究所
オオサカ ダイガク セツゴウ カガク ケンキュウジョ
Joining and Welding Research Institute, Osaka University
Source Title
Transactions of JWRI
Volume (Issue)
44(1)
Page
27-30
Date of Issued
2015-06
Language
English
Handle URL
https://hdl.handle.net/11094/57261
DOI
https://doi.org/10.18910/57261
PISSN
03874508
NCID
AA00867058
Access Rights
open access
oaire:version
Version of Record
Category
紀要論文 Departmental Bulletin Paper
Transactions of JWRI / Vol.44 No.1 (2015-06)