Next Article in Journal
Microstructure and Tensile Properties of the Mg-6Zn-4Al-xSn Die Cast Magnesium Alloy
Next Article in Special Issue
Influence of Material Property Variation on Computationally Calculated Melt Pool Temperature during Laser Melting Process
Previous Article in Journal
The Effect of Mo and Dispersoids on Microstructure, Sintering Behavior, and Mechanical Properties of W-Mo-Ni-Fe-Co Heavy Tungsten Alloys
Previous Article in Special Issue
Study of Formed Oxides in IN718 Alloy during the Fabrication by Selective Laser Melting and Electron Beam Melting
Article Menu
Issue 2 (February) cover image

Export Article

Open AccessArticle

Material Characterization, Thermal Analysis, and Mechanical Performance of a Laser-Polished Ti Alloy Prepared by Selective Laser Melting

1
School of Mechanical Engineering and Automation, Beihang University, 37 Xueyuan Road, Beijing 100191, China
2
ST Engineering—NTU Corporate Laboratory, School of Electrical and Electronic Engineering, Nanyang Technological University, 61 Nanyang Drive, Singapore 637335, Singapore
3
School of Energy and Power Engineering, Beihang University, 37 Xueyuan Road, Beijing 100191, China
4
National Engineering Laboratory of Additive Manufacturing for Large Metallic Components, Beihang University, 37 Xueyuan Road, Beijing 100191, China
5
Hefei Innovation Research Institute of Beihang University, Xinzhan Hi-tech District, Hefei 230013, China
6
Additive Manufacturing Research Group, KU Leuven, Celestijnenlaan, 300- Box 2420, 3001 Leuven, Belgium
*
Authors to whom correspondence should be addressed.
Yu-Hang Li and Bing Wang contributed equally to this work.
Metals 2019, 9(2), 112; https://doi.org/10.3390/met9020112
Received: 29 November 2018 / Revised: 20 December 2018 / Accepted: 19 January 2019 / Published: 22 January 2019
(This article belongs to the Special Issue Advances in Selective Laser Melting)
  |  
PDF [4068 KB, uploaded 24 January 2019]
  |     |  

Abstract

The laser polishing technique offers an adaptable, accurate, and environmentally friendly solution to enhance the surface quality of additive manufactured metallic components. Recent work has shown that the surface roughness of laser additive manufactured metallic alloys can be significantly reduced via the laser polishing method. This paper examines the mechanical performances of a laser polished surface fabricated by selective laser melting (SLM). Compared with the original SLM surface, systematic measurements revealed that the surface roughness of the laser polished surface can be effectively reduced from 6.53 μm to 0.32 μm, while the microhardness and wear resistance increased by 25% and 39%, respectively. Through a thermal history analysis of the laser polishing process using the finite element model, new martensitic phase formation in the laser polished layer is carefully explained, which reveals significant effects on residual stress, strength, and fatigue. These findings establish foundational data to predict the mechanical performance of laser polished metallic components fabricated by additive manufacturing methods, and pave the way for functional surface design with practical application via the laser process. View Full-Text
Keywords: laser polishing; additive manufacturing; selective laser melting; thermal kinetics; mechanical properties laser polishing; additive manufacturing; selective laser melting; thermal kinetics; mechanical properties
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Li, Y.-H.; Wang, B.; Ma, C.-P.; Fang, Z.-H.; Chen, L.-F.; Guan, Y.-C.; Yang, S.-F. Material Characterization, Thermal Analysis, and Mechanical Performance of a Laser-Polished Ti Alloy Prepared by Selective Laser Melting. Metals 2019, 9, 112.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Metals EISSN 2075-4701 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top