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論文

Strengthening mechanism in ferrite and austenite of friction stir welded duplex stainless steel; ${it In situ}$ neutron diffraction study

山下 享介*; 小山 元道*; Gong, W.; 川崎 卓郎; Harjo, S.; 潮田 浩作*; 藤井 英俊*

ISIJ International, 66(4), p.477 - 488, 2026/03

https://doi.org/10.2355/isijinternational.ISIJINT-2025-291
 被引用回数：0 パーセンタイル：0.00(Metallurgy & Metallurgical Engineering)

This study investigated strengthening mechanisms in friction stir welded (FSW) duplex stainless steel (DSS) using in situ neutron diffraction during tensile testing. Two welding conditions, FSW300 and FSW600, produced significant grain refinement, with $$gamma$$ grains below 1 $$mu$$m in FSW300. Both conditions increased yield and tensile strength but reduced elongation compared with the base metal (BM), while FSW300 retained higher total elongation than FSW600. Neutron diffraction revealed that $$gamma$$ was the harder phase in the BM, whereas $$alpha$$ became the harder phase after FSW. Phase stress analysis showed that $$alpha$$ was more sensitive to grain refinement strengthening, shifting the dominant strengthening contribution from $$gamma$$ to $$alpha$$. Although stacking faults in $$gamma$$ increased after FSW, work hardening of $$gamma$$ decreased, while $$alpha$$ showed enhanced texture development and dislocation accumulation.

論文

Mechanical properties of base metal and heat-affected zone in friction-stir-welded AA6061-T6 at ultra-low temperature of 20 K

Nguyen, T.-D.*; Singh, C.*; Kim, Y. S.*; Han, J. H.*; Lee, D.-H.*; Lee, K.*; Harjo, S.; Lee, S. Y.*

Journal of Materials Research and Technology, 31, p.1547 - 1556, 2024/07

https://doi.org/10.1016/j.jmrt.2024.06.165
 被引用回数：9 パーセンタイル：68.96(Materials Science, Multidisciplinary)

This study investigates the mechanical properties of a friction-stir-welded (FSW) AA6061-T6 aluminum alloy at ultra-low temperature (ULT) of 20 K. In-situ neutron diffraction and orientation imaging microscopy were employed to compare the tensile deformation behavior of the base metal (BM) and heat-affected zone (HAZ) in the FSW aluminum plate. The results demonstrate that compared to room-temperature (RT), ULT induces a significant improvement in tensile strength and ductility in both the BM and HAZ. The enhanced mechanical properties in BM at ULT result from a more homogeneous deformation than occurs at RT. On the other hand, HAZ at ULT exhibits an even lower yield strength than at RT, but the strain hardening rate (SHR) is the most significant among the alloys, leading to a tensile strength of 346 MPa and the highest ductility of 46.8%. The lowest yield strength corresponds to the lowest-hardness zones in HAZ, caused by dissolved/coarsened precipitates during the FSW process.

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