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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

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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.

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ACKNOWLEDGMENTS

The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China (Nos. 51575267 and 51322509), the Top-Notch Young Talents Program of China, the Outstanding Youth Foundation of Jiangsu Province of China (No. BK20130035), the Program for New Century Excellent Talents in University (No. NCET-13 -0854), the Science and Technology Support Program (The Industrial Part), the Jiangsu Provincial Department of Science and Technology of China (No. BE2014009-2), the 333 Project (No. BRA2015368), the Aeronautical Science Foundation of China (No. 2015ZE52051), the Shanghai Aerospace Science and Technology Innovation Fund (No. SAST2015053), the Fundamental Research Funds for the Central Universities (Nos. NE2013103, NP2015206 and NZ2016108), and the Priority Academic Program Development of Jiangsu Higher Education Institutions.

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  1. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu Province, 210016, People’s Republic of China

    Hongyu Chen & Dongdong Gu

  2. Institute of Additive Manufacturing (3D Printing), Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu Province, 210016, People’s Republic of China

    Hongyu Chen & Dongdong Gu

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Chen, H., Gu, D. Effect of metallurgical defect and phase transition on geometric accuracy and wear resistance of iron-based parts fabricated by selective laser melting. Journal of Materials Research 31, 1477–1490 (2016). https://doi.org/10.1557/jmr.2016.132

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