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

^*Corresponding author for this work

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 - 1 Feb 2022

Keywords

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

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10.3390/ma15030777

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title = "Transient Phase-Driven Cyclic Deformation in Additively Manufactured 15-5 PH Steel",

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.",

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

author = "Lam, {Tu Ngoc} and Wu, {Yu Hao} and Liu, {Chia Jou} and Hobyung Chae and Lee, {Soo Yeol} and Jayant Jain and Ke An and Huang, {E. Wen}",

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doi = "10.3390/ma15030777",

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T1 - Transient Phase-Driven Cyclic Deformation in Additively Manufactured 15-5 PH Steel

AU - Lam, Tu Ngoc

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

Y1 - 2022/2/1

N2 - 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.

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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U2 - 10.3390/ma15030777

DO - 10.3390/ma15030777

M3 - Article

AN - SCOPUS:85123097851

SN - 1996-1944

VL - 15

JO - Materials

JF - Materials

IS - 3

M1 - 777

ER -

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

Abstract

Keywords

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