Transient Phase-Driven Cyclic Deformation in Additively Manufactured 15-5 PH Steel

Tu Ngoc Lam; Yu Hao Wu; Chia Jou Liu; Hobyung Chae; Soo Yeol Lee; Jayant Jain; Ke An; E. Wen Huang

doi:10.3390/ma15030777

Transient Phase-Driven Cyclic Deformation in Additively Manufactured 15-5 PH Steel

Tu Ngoc Lam, Yu Hao Wu, Chia Jou Liu, Hobyung Chae, Soo Yeol Lee, Jayant Jain, Ke An, E. Wen Huang

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

3 Scopus citations

Abstract

The present work extends the examination of selective laser melting (SLM)-fabricated 15-5 PH steel with the 8%-transient-austenite-phase towards fully-reversed strain-controlled low-cycle fatigue (LCF) test. The cyclic-deformation response and microstructural evolution were investigated via in-situ neutron-diffraction measurements. The transient-austenite-phase rapidly transformed into the martensite phase in the initial cyclic-hardening stage, followed by an almost complete martensitic transformation in the cyclic-softening and steady stage. The compressive stress was much greater than the tensile stress at the same strain amplitude. The enhanced martensitic transformation associated with lower dislocation densities under compression predominantly governed such a striking tension-compression asymmetry in the SLM-built 15-5 PH.

Original language	English
Article number	777
Journal	Materials
Volume	15
Issue number	3
DOIs	https://doi.org/10.3390/ma15030777
State	Published - Feb 1 2022
Externally published	Yes

Funding

Funding: Research conducted at ORNL’s Spallation Neutron Source was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, US Department of Energy. The authors are grateful to the support of the Ministry of Science and Technology (MOST) Programs MOST 110-2224-E-007-001 and MOST 108-2221-E-009-131-MY4. This work was financially supported by the “Center for the Semiconductor Technology Research” from The Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education (MOE) in Taiwan. Also supported in part by the Ministry of Science and Technology, Taiwan, under Grant MOST 110-2634-F-009-027. This work was supported by the Higher Education Sprout Project of the National Yang Ming Chiao Tung University and the MOE, Taiwan. SYL was supported by the National Research Foundation (NRF) grant funded by the Korean Government (2021R1A4A1031494, 2020K2A9A2A06070856). Acknowledgments: E.-W.H. and his group members very much appreciate the financial support from the National Synchrotron Radiation Research Center (NSRRC) Neutron Program.

Keywords

15-5 PH stainless steel
In-situ neutron diffraction
Low-cycle fatigue
Martensite transformation
Selective laser melting

UN SDGs

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

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10.3390/ma15030777

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abstract = "The present work extends the examination of selective laser melting (SLM)-fabricated 15-5 PH steel with the 8%-transient-austenite-phase towards fully-reversed strain-controlled low-cycle fatigue (LCF) test. The cyclic-deformation response and microstructural evolution were investigated via in-situ neutron-diffraction measurements. The transient-austenite-phase rapidly transformed into the martensite phase in the initial cyclic-hardening stage, followed by an almost complete martensitic transformation in the cyclic-softening and steady stage. The compressive stress was much greater than the tensile stress at the same strain amplitude. The enhanced martensitic transformation associated with lower dislocation densities under compression predominantly governed such a striking tension-compression asymmetry in the SLM-built 15-5 PH.",

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AU - Wu, Yu Hao

AU - Liu, Chia Jou

AU - Chae, Hobyung

AU - Lee, Soo Yeol

AU - Jain, Jayant

AU - An, Ke

AU - Huang, E. Wen

PY - 2022/2/1

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AB - The present work extends the examination of selective laser melting (SLM)-fabricated 15-5 PH steel with the 8%-transient-austenite-phase towards fully-reversed strain-controlled low-cycle fatigue (LCF) test. The cyclic-deformation response and microstructural evolution were investigated via in-situ neutron-diffraction measurements. The transient-austenite-phase rapidly transformed into the martensite phase in the initial cyclic-hardening stage, followed by an almost complete martensitic transformation in the cyclic-softening and steady stage. The compressive stress was much greater than the tensile stress at the same strain amplitude. The enhanced martensitic transformation associated with lower dislocation densities under compression predominantly governed such a striking tension-compression asymmetry in the SLM-built 15-5 PH.

KW - 15-5 PH stainless steel

KW - In-situ neutron diffraction

KW - Low-cycle fatigue

KW - Martensite transformation

KW - Selective laser melting

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Transient Phase-Driven Cyclic Deformation in Additively Manufactured 15-5 PH Steel

Abstract

Funding

Keywords

UN SDGs

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