Effects of Laser Cladding Parameters on Microstructure and Properties of Gradient Cladded Coating on 45# Steel

doi:10.12068/j.issn.1005-3026.2019.04.008

Journal of Northeastern University Natural Science ›› 2019, Vol. 40 ›› Issue (4): 495-499.DOI: 10.12068/j.issn.1005-3026.2019.04.008

• Materials & Metallurgy • Previous Articles Next Articles

Effects of Laser Cladding Parameters on Microstructure and Properties of Gradient Cladded Coating on 45^# Steel

XU Ni-jun^1,2， LIU Chang-sheng^1,3， FENG Xin-yu^1,3， SUN Ting⁴

1.Key Laboratory for Anisotropy and Texture of Materials， Ministry of Education， Northeastern University， Shenyang 110819， China; 2. College of Chemistry and Chemical Engineering， Xi’an University of Architecture and Technology， Xi’an 710005， China; 3.Key Laboratory for Laser Application Technology and Equipment of Liaoning Province， Northeastern University， Shenyang 110819， China; 4. School of Sciences， Northeastern University， Shenyang 110819， China.

Received:2018-06-10 Revised:2018-06-10 Online:2019-04-15 Published:2019-04-26
Contact: LIU Chang-sheng
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Abstract

Abstract: The effects of laser cladding power， scanning speed and cladding materials on the microstructure and wear resistance of the cladded coating on 45^# steel were investigated. The results show that the gradient cladded layer is continuous without the defects of crack pores and is metallurgically bonded to the 45^# steel matrix.The microstructure of the cladded layer are characterized by dendritic crystals， equiaxed crystals and other rapid solidification structures， which is composed of α-Fe， CrNiFe-C and Cr₇C₃. The microhardness of the cladded layer is gradient， and the surface hardness of the cladded layer and the transition layer are 7.48GPa and 5.52GPa， respectively， which is 3.74 and 2.76 times of the hardness of the substrate.Therefore， the laser cladding technology can significantly improve the wear resistance of 45^# steel.

Key words: laser cladding, gradient coating, laminar flow cooling roll, 45^# steel, microstructure and properties

CLC Number:

TN249

XU Ni-jun， LIU Chang-sheng， FENG Xin-yu， SUN Ting. Effects of Laser Cladding Parameters on Microstructure and Properties of Gradient Cladded Coating on 45^# Steel[J]. Journal of Northeastern University Natural Science, 2019, 40(4): 495-499.

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Effects of Laser Cladding Parameters on Microstructure and Properties of Gradient Cladded Coating on 45^# Steel

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