Abstract
Laser-powder bed fusion (L-PBF) has gained significant research interest, not only for its profound advantage of producing near-net shape complex geometries of metallic parts, but also for the possibility of producing tailored microstructures. Here we exploit the capability of manipulating the crystallographic texture by L-PBF to tailor the deformation behavior of austenitic stainless steels. In specific, by adjusting the laser power and the laser scanning speed, tailored crystallographic textures can be obtained, along the uniaxial loading direction in 304L stainless steel samples produced by L-PBF. In situ neutron diffraction and uniaxial tension and compression tests are undertaken to investigate the extent of the transformation induced plasticity effect and to correlate it with the tailored macrostructures. The influence of the initial and the evolving crystallographic texture on the deformation behavior is demonstrated and elaborated accordingly. The observed asymmetry in the deformation behavior between tension and compression is also discussed in detail.
Original language | English |
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Article number | 110789 |
Journal | Materials and Design |
Volume | 219 |
DOIs | |
State | Published - Jul 2022 |
Funding
CS and EP acknowledge the financial support from the Swiss National Science Foundation (SNSF), Project number: 200021_188767. MS and JC acknowledge the financial support from the Strategic Focus Area Advanced Manufacturing (SFA-AM) initiative of the ETH Board. RL acknowledges the generous support of PX Group to the LMTM laboratory. This research used the VULCAN instrument at Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory.
Keywords
- Additive manufacturing
- Austenite
- Martensite
- Neutron diffraction
- Stacking fault energy
- Stainless steel