Hardening steels by the generation of transient phase using additive manufacturing

E. Wen Huang; Soo Yeol Lee; Jayant Jain; Yang Tong; Ke An; Nien Ti Tsou; Tu Ngoc Lam; Dunji Yu; Hobyung Chae; Shi Wei Chen; Shih Min Chen; Hung Sheng Chou

doi:10.1016/j.intermet.2019.03.004

Hardening steels by the generation of transient phase using additive manufacturing

E. Wen Huang, Soo Yeol Lee, Jayant Jain, Yang Tong, Ke An, Nien Ti Tsou, Tu Ngoc Lam, Dunji Yu, Hobyung Chae, Shi Wei Chen, Shih Min Chen, Hung Sheng Chou

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

23 Scopus citations

Abstract

In the present work, the tensile properties of 15–5 PH steel fabricated by selective laser melting (SLM) were examined with respect to the transient austenite phase. Compared with the 8%-transient-phase sample, the 18%-transient-phase one shows higher ultimate tensile strength and relatively low yield strength, as well as hardening behavior. We conducted in-situ neutron-diffraction study to examine the microstructure evolution for mechanistic understanding. After applying the external load, most non-equilibrium, retained austenite in the 8%-transient-phase sample transforms before the yield strength, whereas in the 18%-transient-phase sample only 50% of the austenite transforms. Accompanying with the phase transformation, a decrease in the dislocation density and the dislocation strain energy-assisted phase transformation of the ferrite phase are found in the 8%-transient-phase sample even before yielding, which, however, is not the case in the 18%-transient-phase sample. The study demonstrates the SLM enables tuning the amount of transient-phase ratio and coherency between phases to realize a mechanical property control for additive manufactured steel.

Original language	English
Pages (from-to)	60-67
Number of pages	8
Journal	Intermetallics
Volume	109
DOIs	https://doi.org/10.1016/j.intermet.2019.03.004
State	Published - Jun 1 2019
Externally published	Yes

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. EWH appreciates the support from Ministry of Science and Technology Programs 107-3017-F-009-002 , 107-3011-F-002-002 , 107-2628-E-009-001-MY3 , and 107-2218-E-009-003 . TNL was supported by MOST 107-2628-E-009-001-MY3 and “ Center for Semiconductor Technology Research ” 107W302 from The Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education (MOE) in Taiwan. EWH and his group members very much appreciate the financial support from the National Synchrotron Radiation Research Center (NSRRC) Neutron Program. SYL was supported by the National Research Foundation of Korea grants (No. 2016R1A2B4015701 , No. 2017K1A3A7A09016308 ). 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. EWH appreciates the support from Ministry of Science and Technology Programs 107-3017-F-009-002, 107-3011-F-002-002, 107-2628-E-009-001-MY3, and 107-2218-E-009-003. TNL was supported by MOST 107-2628-E-009-001-MY3 and “Center for Semiconductor Technology Research” 107W302 from The Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education (MOE) in Taiwan. EWH and his group members very much appreciate the financial support from the National Synchrotron Radiation Research Center (NSRRC) Neutron Program. SYL was supported by the National Research Foundation of Korea grants (No. 2016R1A2B4015701, No. 2017K1A3A7A09016308).

Funders	Funder number
Ministry of Science and Technology Programs
Scientific User Facilities Division
U.S. Department of Energy
Basic Energy Sciences
Ministry of Education
Ministry of Science and Technology	107-3017-F-009-002, 107-3011-F-002-002, 107-2628-E-009-001-MY3, 107-2218-E-009-003
National Research Foundation of Korea	2017K1A3A7A09016308, 2016R1A2B4015701
Ministry of Science and Technology, Taiwan	107W302
National Synchrotron Radiation Research Center

Keywords

Additive manufacturing
Anisotropy
Neutron diffraction
Selective laser melting
Stainless steel

UN SDGs

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

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10.1016/j.intermet.2019.03.004

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title = "Hardening steels by the generation of transient phase using additive manufacturing",

abstract = "In the present work, the tensile properties of 15–5 PH steel fabricated by selective laser melting (SLM) were examined with respect to the transient austenite phase. Compared with the 8%-transient-phase sample, the 18%-transient-phase one shows higher ultimate tensile strength and relatively low yield strength, as well as hardening behavior. We conducted in-situ neutron-diffraction study to examine the microstructure evolution for mechanistic understanding. After applying the external load, most non-equilibrium, retained austenite in the 8%-transient-phase sample transforms before the yield strength, whereas in the 18%-transient-phase sample only 50% of the austenite transforms. Accompanying with the phase transformation, a decrease in the dislocation density and the dislocation strain energy-assisted phase transformation of the ferrite phase are found in the 8%-transient-phase sample even before yielding, which, however, is not the case in the 18%-transient-phase sample. The study demonstrates the SLM enables tuning the amount of transient-phase ratio and coherency between phases to realize a mechanical property control for additive manufactured steel.",

keywords = "Additive manufacturing, Anisotropy, Neutron diffraction, Selective laser melting, Stainless steel",

author = "Huang, {E. Wen} and Lee, {Soo Yeol} and Jayant Jain and Yang Tong and Ke An and Tsou, {Nien Ti} and Lam, {Tu Ngoc} and Dunji Yu and Hobyung Chae and Chen, {Shi Wei} and Chen, {Shih Min} and Chou, {Hung Sheng}",

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doi = "10.1016/j.intermet.2019.03.004",

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AU - Huang, E. Wen

AU - Lee, Soo Yeol

AU - Jain, Jayant

AU - Tong, Yang

AU - An, Ke

AU - Tsou, Nien Ti

AU - Lam, Tu Ngoc

AU - Yu, Dunji

AU - Chae, Hobyung

AU - Chen, Shi Wei

AU - Chen, Shih Min

AU - Chou, Hung Sheng

PY - 2019/6/1

Y1 - 2019/6/1

N2 - In the present work, the tensile properties of 15–5 PH steel fabricated by selective laser melting (SLM) were examined with respect to the transient austenite phase. Compared with the 8%-transient-phase sample, the 18%-transient-phase one shows higher ultimate tensile strength and relatively low yield strength, as well as hardening behavior. We conducted in-situ neutron-diffraction study to examine the microstructure evolution for mechanistic understanding. After applying the external load, most non-equilibrium, retained austenite in the 8%-transient-phase sample transforms before the yield strength, whereas in the 18%-transient-phase sample only 50% of the austenite transforms. Accompanying with the phase transformation, a decrease in the dislocation density and the dislocation strain energy-assisted phase transformation of the ferrite phase are found in the 8%-transient-phase sample even before yielding, which, however, is not the case in the 18%-transient-phase sample. The study demonstrates the SLM enables tuning the amount of transient-phase ratio and coherency between phases to realize a mechanical property control for additive manufactured steel.

AB - In the present work, the tensile properties of 15–5 PH steel fabricated by selective laser melting (SLM) were examined with respect to the transient austenite phase. Compared with the 8%-transient-phase sample, the 18%-transient-phase one shows higher ultimate tensile strength and relatively low yield strength, as well as hardening behavior. We conducted in-situ neutron-diffraction study to examine the microstructure evolution for mechanistic understanding. After applying the external load, most non-equilibrium, retained austenite in the 8%-transient-phase sample transforms before the yield strength, whereas in the 18%-transient-phase sample only 50% of the austenite transforms. Accompanying with the phase transformation, a decrease in the dislocation density and the dislocation strain energy-assisted phase transformation of the ferrite phase are found in the 8%-transient-phase sample even before yielding, which, however, is not the case in the 18%-transient-phase sample. The study demonstrates the SLM enables tuning the amount of transient-phase ratio and coherency between phases to realize a mechanical property control for additive manufactured steel.

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KW - Anisotropy

KW - Neutron diffraction

KW - Selective laser melting

KW - Stainless steel

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Hardening steels by the generation of transient phase using additive manufacturing

Abstract

Funding

Keywords

UN SDGs

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