TY - JOUR
T1 - Microstructure and properties of friction stir welded high strength Fe-36wt%Ni alloy
AU - Zhao, Yue
AU - Sato, Yutaka S.
AU - Kokawa, Hiroyuki
AU - Wu, Aiping
N1 - Funding Information:
The authors are grateful to Mr. A. Honda, Prof. G. Miyamoto, Mr. Z.D. Li, Dr. S. Mironov and Dr. K. Kobayashi for technical assistance, and thank Prof. K. Maruyama and Prof. T. Furuhara for their helpful discussions. One of the authors (Y. Zhao) thanks Joint Education Program between Tohoku University and Tsinghua University. We also acknowledge financial support from the Japanese Ministry of Education, Science, Sports and Culture with a Grant-in-Aid from the Global COE program in Materials Integration International Center of Education and Research at Tohoku University.
PY - 2011/9/25
Y1 - 2011/9/25
N2 - High strength Fe-36. wt%Ni alloy sheets with 3. mm thickness were successfully friction stir welded and defect-free welds were acquired at travelling speed of 2. mm/s and rotational speed between 600 and 1000. rpm. Essentially, the friction stir welding process did not change the excellent thermal expansion properties of Fe-36. wt%Ni alloy. Friction stir welding resulted in a uniform coarser-grained microstructure in the stir zone with comparable fractions of low angle boundaries and Σ3 twin boundaries to the base material. However, approximate 10% reductions of hardness and tensile strength were found in the joint. The relationship between grain size and mechanical properties of friction stir welds was discussed. The base material has higher mechanical properties, not only because of the finer average grain size, but also attribute to its inhomogeneous grain structure.
AB - High strength Fe-36. wt%Ni alloy sheets with 3. mm thickness were successfully friction stir welded and defect-free welds were acquired at travelling speed of 2. mm/s and rotational speed between 600 and 1000. rpm. Essentially, the friction stir welding process did not change the excellent thermal expansion properties of Fe-36. wt%Ni alloy. Friction stir welding resulted in a uniform coarser-grained microstructure in the stir zone with comparable fractions of low angle boundaries and Σ3 twin boundaries to the base material. However, approximate 10% reductions of hardness and tensile strength were found in the joint. The relationship between grain size and mechanical properties of friction stir welds was discussed. The base material has higher mechanical properties, not only because of the finer average grain size, but also attribute to its inhomogeneous grain structure.
KW - Electron back-scatter diffraction
KW - Fe-36wt%Ni alloy
KW - Friction stir welding
KW - Mechanical properties
KW - Microstructure
KW - Thermal expansion coefficient
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U2 - 10.1016/j.msea.2011.06.082
DO - 10.1016/j.msea.2011.06.082
M3 - Article
AN - SCOPUS:79961168389
SN - 0921-5093
VL - 528
SP - 7768
EP - 7773
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
IS - 25-26
ER -