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Effect of metallurgical defect and phase transition on geometric accuracy and wear resistance of iron-based parts fabricated by selective laser melting

Published online by Cambridge University Press:  19 April 2016

Hongyu Chen  and
Dongdong Gu
Hongyu Chen
Affiliation:
College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, Jiangsu Province, People's Republic of China; and Institute of Additive Manufacturing (3D Printing), Nanjing University of Aeronautics and Astronautics, Nanjing 210016, Jiangsu Province, People's Republic of China
Dongdong Gu*
Affiliation:
College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, Jiangsu Province, People's Republic of China; and Institute of Additive Manufacturing (3D Printing), Nanjing University of Aeronautics and Astronautics, Nanjing 210016, Jiangsu Province, People's Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

A systematic analysis of effect of metallurgical defect and phase transition on geometric accuracy and wear resistance of iron-based parts fabricated by selective laser melting was conducted. By composition optimization of alloying elements, the desirable martensitic structure was directly obtained based on high-speed laser induction and the content of retained austenite was observed to be different under various laser parameters. Using an optimized scan speed of 1600 mm/s could lead to the highest densification level of 99.24% and the lowest content of retained austenite of 3.5%, hence acquiring a considerably high Rockwell hardness of 61.9 HRC, a reduced coefficient of friction of 0.40, and wear rate of 1.8 × 10−5 mm3/N m. A thorough investigation of dimension offset due to martensite transformation in conjunction with theoretical calculation was performed. Lower top surface roughness (5.25 μm) and reduced side roughness (13.84 μm) were achieved at the optimized scan speed of 1600 mm/s.

Keywords

selective laser meltingphase transitionaccuracyroughnesswear property
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 10 , 28 May 2016 , pp. 1477 - 1490
Copyright
Copyright © Materials Research Society 2016 

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References

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