Microstructure and Wear-Resistance Property of Laser Cladding Layer on GH710

Abstract:

To repair the damages of aero blades, laser cladding on GH710 substrate using NiCrMoNb powder by CO2 laser was carried out. The microstructure and microhardness of cladding layers were investigated. The property of dry sliding friction and wear in the air was tested. It was found that the cladding layer was well combined with the substrate. The white narrow metallurgical bonding zone was about 15~20μm. The microstructure transformed from coarse columnar grains to fine dendritic grains from bottom to top and the net-like grains were fabricated on the surface. The axis of columnar grains was perpendicular to the direction of the melting line. Columnar grains had the scale of 10~15μm on the width and 50~60μm in the axis direction. The area of the crystal lattice varied from 2μm×4μm to 5μm×9μm. The microhardness of cladding layer, metallurgical bonding zone and the substrate changed gradually. The microhardness was 450HV, 40%~50% higher than that of the substrate. The wearing capacity was 50%~55% of that of the substrate. The main form of abrasion was grain-abrasion and adhesion-abrasion.

• Periodical: Advanced Materials Research (Volumes 479-481)
• Pages: 88-92
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.479-481.88
• Online since: February 2012
• Authors: Bin Hu, Fang You Hu, Xu Ren Huang, De Xian Yi, Pei Zhong Zhao, Ai Yong Cui, Chang Liang Lu, Peng Fei Fu
• Keywords: Adhesion-Abrasion, Cladding Layer, Friction Wear, Grain-Abrasion, Laser Cladding

References

[1] Fu Guo-ru, Yu Zhe-ming, Wang Hong-wei. Main Failure Attributes and Rule of Compressor-blades in Aeo-engines. Failure Analysis and Prevention, 2006,1(1):18-24(In Chinese)

[2] Tian Y S., Chen C Z.,Research progress on laser surface modification of titanium alloys, Applied Surface Science 2005,242:177-184

DOI: 10.1016/j.apsusc.2004.08.011

[3] Ming- Ju Chao, Er- Jun Liang. Effect of TiO2-doping on the microstructure and the wear properties of laser-clad nickel-based coatings. Surf. Coat . Tech. , 2004, 179( 2- 3) : 265

DOI: 10.1016/s0257-8972(03)00857-0

[4] LI Sheng, ZENG Xiao-yan, HU Qian-wu.Influence of Multilayer Cladding on Microstructure and Hardnessof Laser-Clad Layers. Chinese J.Lasers, 2007, 32(7):44-47(In Chinese)

[5] Y.S. Tian C.Z. Chen,Research progress on laser surface modification of titanium alloys, Applied Surface Science 242(2005):177–184

DOI: 10.1016/j.apsusc.2004.08.011

[6] Cui Ai-yong, Hu Fang-you, Hui Li. Microstructure and Wear-Resisting Property of (Ti+Al/Ni)/(Cr2O3+CeO2) Laser Cladding on Titanium Alloy. Chinese J.Lasers, 2007, 34(3):438-441(In Chinese)

[7] ueno, S., Moreno, R. and Baud´ın, C., Reaction sintered Al2O3/Al2TiO5 microcrack-free composites obtained by colloidal filtration. J. Eur. Ceram.Soc., 2004, 24(9), 2785–2791.

DOI: 10.1016/j.jeurceramsoc.2003.08.015

[8] Y.Wang. H.M. Wang. Wear resistance of laser clad Ti2Ni3Si reinforced intermetallic composite coatings on titanium alloy. Applied Surface Science. 2004:229:81-86

DOI: 10.1016/j.apsusc.2004.01.045

[9] Z.H. Melgarejo. O.M. Suarez. K.Sridharan. Wear resistance of a functionally-graded aluminum matrix composite. Scripta Materialia. 2006:55(1):95-98

DOI: 10.1016/j.scriptamat.2006.03.031