Insights into the Transformation-Induced Plasticity (TRIP) Effect in Ti-Free Grade 300 Maraging Steel Manufactured by Laser Powder Bed Fusion (LPBF)

Rangasayee Kannan; Peeyush Nandwana

doi:10.1007/s11837-020-04425-9

Insights into the Transformation-Induced Plasticity (TRIP) Effect in Ti-Free Grade 300 Maraging Steel Manufactured by Laser Powder Bed Fusion (LPBF)

Rangasayee Kannan, Peeyush Nandwana

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

The near-net fabrication capabilities of laser powder-bed fusion (LPBF) offer the potential to manufacture tools with complex cooling channels that can improve the production efficiency of the tools with reduced greenhouse gas emissions. High strength, toughness, and wear resistance are some of the key properties required by the tooling industries to qualify tools. While strength can be increased through appropriate heat treatments, the increase in strength comes with an associated ductility loss. We show that the non-equilibrium conditions inherent to LPBF can suppress the transformation-induced plasticity effect to room temperature in a Ti-free version of grade 300 maraging steel (G300MS), which is commonly not observed at room temperature in G300MS manufactured using conventional methods. The presence of retained austenite along with Ni-rich regions was found to increase the kinetics for austenite reversion during aging, thereby enabling the transformation of austenite into ε martensite during tensile deformation at room temperature, in turn increasing the strength with minimal ductility loss.

Original language	English
Pages (from-to)	4187-4195
Number of pages	9
Journal	JOM
Volume	72
Issue number	12
DOIs	https://doi.org/10.1007/s11837-020-04425-9
State	Published - Dec 2020

Funding

Notice of Copyright: This manuscript has been authored by UT-Battelle, LLC, under Contract No. DE-AC05-00OR22725 with the US Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ). The author PN acknowledges Andrew Nguyen, AddUp Inc., for providing the LPBF samples used in this work. PN and RK acknowledge Dr. Donovan Leonard for help with the S/TEM measurements. Research was performed at the US Department of Energy’s Manufacturing Demonstration Facility, located at Oak Ridge National Laboratory. Research was co-sponsored by the US Department of Energy, Office of Energy Efficiency and Renewable Energy, Advanced Manufacturing Office. This manuscript has been authored by UT-Battelle, LLC, under Contract No. DE-AC05-00OR22725 with the US Department of Energy.

Funders	Funder number
AddUp Inc.
U.S. Department of Energy
Advanced Manufacturing Office	DE-AC05-00OR22725
Office of Energy Efficiency and Renewable Energy
Oak Ridge National Laboratory

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1007/s11837-020-04425-9

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abstract = "The near-net fabrication capabilities of laser powder-bed fusion (LPBF) offer the potential to manufacture tools with complex cooling channels that can improve the production efficiency of the tools with reduced greenhouse gas emissions. High strength, toughness, and wear resistance are some of the key properties required by the tooling industries to qualify tools. While strength can be increased through appropriate heat treatments, the increase in strength comes with an associated ductility loss. We show that the non-equilibrium conditions inherent to LPBF can suppress the transformation-induced plasticity effect to room temperature in a Ti-free version of grade 300 maraging steel (G300MS), which is commonly not observed at room temperature in G300MS manufactured using conventional methods. The presence of retained austenite along with Ni-rich regions was found to increase the kinetics for austenite reversion during aging, thereby enabling the transformation of austenite into ε martensite during tensile deformation at room temperature, in turn increasing the strength with minimal ductility loss.",

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Insights into the Transformation-Induced Plasticity (TRIP) Effect in Ti-Free Grade 300 Maraging Steel Manufactured by Laser Powder Bed Fusion (LPBF)

Abstract

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UN SDGs

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