Selective Laser Melting Under the Reactive Atmosphere: A Convenient and Efficient Approach to Fabricate Ultrahigh Strength Commercially Pure Titanium Without Sacrificing Ductility

50 Pages Posted: 7 Jan 2019

See all articles by D.W. Wang

D.W. Wang

Southern University of Science and Technology - Shenzhen Key Laboratory for Additive Manufacturing of High-performance Materials; Harbin Institute of Technology - State Key Laboratory of Advanced Welding and Joining; Southern University of Science and Technology - Department of Materials Science and Engineering

Y.H. Zhou

Harbin Institute of Technology - School of Material Science and Engineering; Southern University of Science and Technology - Shenzhen Key Laboratory for Additive Manufacturing of High-performance Materials; Southern University of Science and Technology - Department of Materials Science and Engineering

J. Shen

Shenzhen University - College of Mechatronics and Control Engineering

Y. Liu

Central South University - State Key Laboratory of Powder Metallurgy

D.F. Li

Harbin Institute of Technology - College of Science

Q. Zhou

Nanjing University of Science and Technology - School of Material Science and Engineering

G. Sha

Nanjing University of Science and Technology - School of Material Science and Engineering

P. Xu

German Helmholtz-Zentrum Geesthacht - Institute of Materials Research

T. Ebel

German Helmholtz-Zentrum Geesthacht - Institute of Materials Research

M. Yan

Southern University of Science and Technology - Department of Materials Science and Engineering; Southern University of Science and Technology - Shenzhen Key Laboratory for Additive Manufacturing of High-performance Materials

Date Written: January 7, 2019

Abstract

This study presents a novel approach for the fabrication of commercially pure titanium (CP-Ti) components. The approach conferred superb strength to CP-Ti without sacrificing its ductility. A yield strength of 807 MPa combined with 19.15% elongation was realized through selective laser melting (SLM) by using a high power laser and incorporating solute atoms from the Ar−N2 reactive atmosphere. The mechanical properties and the microstructures of the as-printed CP-Ti were systematically investigated. Transmission electron microscopy, electron backscatter diffraction, and atom probe tomography were employed to reveal the mechanism underlying the in situ reaction between CP-Ti and the reactive atmosphere. Results suggest that nitrogen is generally dissolved in the α-Ti matrix as interstitial solute atoms. The beneficial N content has a critical limit of ~0.43 wt.%. The ductility of CP-Ti will decrease drastically if its N content exceeds this limit. A constitutive model is developed for predicting the tensile deformation behavior of the in situ strengthened CP-Ti with various solute concentrations and grain sizes. This work demonstrates a promising methodology for the production of high-performance metallic components and extends the fundamental understanding of SLM process under the reactive atmosphere.

Keywords: Additive manufacturing, Selective laser melting, Commercially pure titanium, Atmosphere, Mechanical property

Suggested Citation

Wang, D.W. and Zhou, Y.H. and Shen, J. and Liu, Y. and Li, D.F. and Zhou, Q. and Sha, G. and Xu, P. and Ebel, T. and Yan, M., Selective Laser Melting Under the Reactive Atmosphere: A Convenient and Efficient Approach to Fabricate Ultrahigh Strength Commercially Pure Titanium Without Sacrificing Ductility (January 7, 2019). Available at SSRN: https://ssrn.com/abstract=3310270 or http://dx.doi.org/10.2139/ssrn.3310270

D.W. Wang (Contact Author)

Southern University of Science and Technology - Shenzhen Key Laboratory for Additive Manufacturing of High-performance Materials

No 1088, xueyuan Rd.
Xili, Nanshan District
Shenzhen, Guangdong 518055
China

Harbin Institute of Technology - State Key Laboratory of Advanced Welding and Joining

92 West Dazhi Street
Nan Gang District
Harbin, 150001
China

Southern University of Science and Technology - Department of Materials Science and Engineering

No 1088, xueyuan Rd.
Xili, Nanshan District
Shenzhen, Guangdong 518055
China

Y.H. Zhou

Harbin Institute of Technology - School of Material Science and Engineering

92 West Dazhi Street
Nan Gang District
Harbin, 150001
China

Southern University of Science and Technology - Shenzhen Key Laboratory for Additive Manufacturing of High-performance Materials

No 1088, xueyuan Rd.
Xili, Nanshan District
Shenzhen, Guangdong 518055
China

Southern University of Science and Technology - Department of Materials Science and Engineering

No 1088, xueyuan Rd.
Xili, Nanshan District
Shenzhen, Guangdong 518055
China

J. Shen

Shenzhen University - College of Mechatronics and Control Engineering

3688 Nanhai Road, Nanshan District
Shenzhen, Guangdong 518060
China

Y. Liu

Central South University - State Key Laboratory of Powder Metallurgy

Changsha, Hunan 410083
China

D.F. Li

Harbin Institute of Technology - College of Science

92 West Dazhi Street
Nan Gang District
Harbin, 150001
China

Q. Zhou

Nanjing University of Science and Technology - School of Material Science and Engineering

No.219, Ningliu Road
Nanjing, Jiangsu
China

G. Sha

Nanjing University of Science and Technology - School of Material Science and Engineering

No.219, Ningliu Road
Nanjing, Jiangsu
China

P. Xu

German Helmholtz-Zentrum Geesthacht - Institute of Materials Research

21502 Geesthacht
Germany

T. Ebel

German Helmholtz-Zentrum Geesthacht - Institute of Materials Research

21502 Geesthacht
Germany

M. Yan

Southern University of Science and Technology - Department of Materials Science and Engineering ( email )

No 1088, xueyuan Rd.
Xili, Nanshan District
Shenzhen, Guangdong 518055
China

Southern University of Science and Technology - Shenzhen Key Laboratory for Additive Manufacturing of High-performance Materials ( email )

No 1088, xueyuan Rd.
Xili, Nanshan District
Shenzhen, Guangdong 518055
China

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