Microstructure and Wear Resistance of Low Energy Density Gas Laser Surface Melting on AZ31B Magnesium Alloy

Applied laser ◽  
2012 ◽  
Vol 32 (6) ◽  
pp. 474-478
Author(s):  
葛亚琼 Ge Yaqiong ◽  
郭谡 Guo Su ◽  
王鑫 Wang Xin ◽  
王文先 Wang Wenxian ◽  
李想 Li Xiang
Keyword(s):  
Wear Resistance ◽  
Magnesium Alloy ◽  
Energy Density ◽  
Surface Melting ◽  
Laser Surface ◽  
Low Energy ◽  
Laser Surface Melting ◽  
Az31b Magnesium Alloy ◽  
Gas Laser

Influence of Laser Surface Melting on Wear Resistance of AZ91D Magnesium Alloy

2010 ◽  
Vol 33 ◽  
pp. 607-611 ◽  
Author(s):  
Ju Fang Chen ◽  
Xing Cheng Li ◽  
Ren Xing Li ◽  
Lai Di Shen
Keyword(s):  
Wear Resistance ◽  
Magnesium Alloy ◽  
Continuous Wave ◽  
Surface Hardness ◽  
Surface Melting ◽  
Laser Surface ◽  
Laser Surface Melting ◽  
Melted Zone ◽  
Average Grain Size ◽  
Melted Layer

In the present study, an attempt has been made to improve the surface hardness and wear resistance of magnesium alloy AZ91D by laser surface melting (LSM) with a 2kW continuous wave CO2 laser. The microstructure of the laser surface melted zone consists of fine dendrites with an average grain size of less than 10μm. Micro hardness of the melted zone was improved to 70-85HV as compared to 53HV of the substrate. The wear behavior of the laser surface melted layer was investigated using a ball-on-flat apparatus under dry sliding condition. Compared with the as-received AZ91D, the wear volume of the laser surface melted layer was decreased by 51%, the wear resistance of the laser surface melted layer was improved significantly.

Effect of CO2 Laser Surface Melting on the Microstructure of AZ91D Magnesium Alloy

2011 ◽  
Vol 464 ◽  
pp. 461-464
Author(s):  
Ju Fang Chen ◽  
Xing Cheng Li ◽  
Jiang Tao Wang ◽  
Wei Ning Lei
Keyword(s):  
Grain Size ◽  
Magnesium Alloy ◽  
Continuous Wave ◽  
Surface Melting ◽  
Laser Surface ◽  
Laser Surface Melting ◽  
Micro Hardness ◽  
Az91d Magnesium Alloy ◽  
Average Grain Size ◽  
Melted Layer

In the present study, the effect of laser surface melting (LSM) on microstructure of AZ91D magnesium alloy was investigated with a 2kW continuous wave CO2 laser. The results indicate that both the substrate and laser melted layer mainly consisted of α-Mg and β-Mg17Al12, the amount of β-phase in laser melted layer was decreased as compared to that of the substrate. The microstructure of the laser surface melted zone consists of fine dendrites with an average grain size of less than 10m, the grain size was reduced by a factor of more than 10 times as compared to that of the substrate. The micro-hardness of the melted layer was increased to 70–85HV as compared to that of the substrate (about 53HV). Because of the grain refinement, the enhancement of the hard phase β-Mg17Al12, and the solid solution hardening of alloy elements, the micro-hardness and strength of the laser melted layer was increased significantly.

Microstructural Investigation of Laser Surface Melting on ZM5 Magnesium Alloy

Applied laser ◽  
2011 ◽  
Vol 31 (4) ◽  
pp. 317-321
Author(s):  
陈长军 Chen Changjun ◽  
张敏 Zhang Min ◽  
张诗昌 Zhang Shichang ◽  
常庆明 Chang Qingming
Keyword(s):  
Magnesium Alloy ◽  
Surface Melting ◽  
Laser Surface ◽  
Laser Surface Melting ◽  
Microstructural Investigation

Influence of Laser Surface Melting on the Microstructure and Corrosion Behaviour of ZE41 Magnesium Alloy

2009 ◽  
Vol 618-619 ◽  
pp. 263-268 ◽  
Author(s):  
Parama Chakraborty Banerjee ◽  
R.K. Singh Raman ◽  
Y. Durandet ◽  
Grant McAdam
Keyword(s):  
Magnesium Alloy ◽  
Continuous Wave ◽  
Corrosion Behaviour ◽  
Processing Parameters ◽  
Wave Mode ◽  
Surface Melting ◽  
Laser Surface ◽  
Laser Surface Melting ◽  
Beam Diameter ◽  
Corrosion Properties

In the present study, surface melting of a magnesium alloy, ZE41 (4%-Zn, 1%-RE) is performed by an Nd:YAG laser (operating in a continuous wave mode). The degree of microstructural refinement and the depth of the laser melted zone is a strong function of laser processing parameters (laser power, beam diameter, scan rate). The corrosion properties of the laser treated and untreated zone is investigated by potentiodynamic polarization method. The microstructural changes on the surface due to laser surface melting were analysed by optical microscopy, scanning electron microscopy and energy dispersive X-ray spectroscopy to understand their effect on the corrosion behaviour of ZE41.

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