学術雑誌論文

学術雑誌論文

text

Crystals. 2022, 12(6), p. 842

Effects of Recrystallization on Tensile Anisotropic Properties for IN738LC Fabricated by Laser Powder Bed Fusion

MDPI

英語

text

2022-06-15

https://doi.org/10.3390/cryst12060842

Hibino S., Fujimitsu K., Azuma M., et al. Effects of Recrystallization on Tensile Anisotropic Properties for IN738LC Fabricated by Laser Powder Bed Fusion. Crystals, 12, 6, 842. https://doi.org/10.3390/cryst12060842.

This study demonstrates the effects of recrystallization on tensile properties and the anisotropy of IN738LC, a typical γ’ precipitation-strengthened alloy, at both room and high temperatures via the laser powder bed fusion process. The nonrecrystallized columnar microstructure, subjected to standard IN738LC heat treatment up to 1120◦ C, and the almost fully recrystallized microstructure, heat-treated at 1204◦ C, were compared. The tensile properties strongly depend on whether recrystallization was completed as well as the tensile direction. This can be explained by microstructure characterization, featuring the Taylor factor in the tensile direction, average grain size estimated by ellipse approximation, and the relationship between the grain shape and tensile direction. The shape of the recrystallized grains and the distribution of coarse MC carbides inside the recrystallized grains were determined by the microstructure in an as-built state. In high-temperature tensile tests conducted in the horizontal direction, the separation of the columnar grains caused a brittle fracture. In contrast, dimples were observed at the fracture surface after recrystallization, indicating scope for further improvement in ductility.

This article is licensed under a Creative Commons Attribution 4.0 International License.

89749

Effects of Recrystallization on Tensile Anisotropic Properties for IN738LC Fabricated by Laser Powder Bed Fusion

MDPI

英語

2022-06-15

Crystals

12

6

842

https://doi.org/10.3390/cryst12060842

https://hdl.handle.net/11094/89749