| METALS AND METAL MATRIX COMPOSITES |
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| Heat Input Effect of Selective Laser Melting on Microstructure and Performance of the Layer Deposited by Inconel718 |
| QIN Xiang1, YANG Jun1,2, ZOU Dening1,2, XIE Yanxiang3
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1 School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China;
2 Shaanxi Key Laboratory of Gold and Resources, Xi’an University of Architecture and Technology, Xi’an 710055, China;
3 Shaanxi Key Laboratory of Surface Engineering and Remanufacturing, Xi’an University, Xi’an 710065, China |
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Abstract The Inconel718 coating was formed on 55Mn2 steel by selective laser melting (SLM). The effects of laser line energy density on the surface microstructure, relative density, microhardness of coating and shear strength between the coating and the substrate were systematically studied. The results showed that with the increase of laser line energy density, the number of spherical particles on the surface of the coating decreased due to nodulizing phenomenon. The internal precipitated δ phase refined gradually and the columnar crystal evenly distributed. The internal structure density and microhardness of the coating increased gradually with the increase of the laser line energy density. The density and the microhardness reached 99.6% and 428.6HV0.2 when the line energy density was 357.14 J/m. The fracture morphology of the coating and the matrix displayed a ductile fracture mode, and the shear strength in the experimental parameter range was 1.9 to 2.15 times of the matrix. The results provide an experimental and theoretical basis on repairing and strengthening the roll surface by selective laser melting.
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Published: 15 January 2020
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| About author:: Xiang Qin, master candidate of Xi’an University of Architecture and Technology, majored in metallurgical engineering institute. Graduated from Xi’an University of Architecture and Technology with a major in metallurgical engineering. Mainly engaged in surface modification technology research direction, conduct research on rolls remanufacturing and surface reinforcement;Jun Yang, professor, Xi’an University of Architecture and Technology. Graduated from Xi’an Jiaotong University of materials science and technology in 2007. Since 1995, he has been taught in the metallurgical institute of Xi’an University of Architecture and Techno-logy, mainly engaged in continuous casting and furnace refining process, material surface modification and advanced steel structure material research. He has partici-pated in 3 national natural resources funds and 8 provincial, ministerial and departmental funds. He published more than 100 papers, including 40 of which in SCI, more than 20 in EI and more than 800 times of citation frequency. He published more than 100 papers, including 14 of which in SCI, more than 20 in EI and more than 140 times of citation frequency. And has participated in many international conferences as a committee member; a chairman of the sub-session and a secretary-general confe-rence. |
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2020, Vol. 34 
