Optimization of mechanical properties of bulk metallic glasses by residual stress adjustment using laser surface melting

2012 ◽  
Vol 66 (12) ◽  
pp. 1057-1060 ◽  
Author(s):  
Bingqing Chen ◽  
Yan Li ◽  
Min Yi ◽  
Ran Li ◽  
Shujie Pang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Residual Stress ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
Surface Melting ◽  
Laser Surface ◽  
Laser Surface Melting

Relationship between Laser Parameters - Microstructural Modification - Mechanical Properties of Laser Surface Melted Magnesium Alloy AZ91D

2013 ◽  
Vol 765 ◽  
pp. 678-682
Author(s):  
Catalina Taltavull ◽  
Belen Torres ◽  
Antonio Julio Lopez ◽  
Joaquin Rams
Keyword(s):  
Mechanical Properties ◽  
Surface Treatment ◽  
Laser Scanning ◽  
High Energy ◽  
Surface Melting ◽  
Laser Surface ◽  
Laser Surface Melting ◽  
Beam Power ◽  
Laser Parameters ◽  
Alloy Az91d

Laser surface melting is a high-energy surface treatment that allows modification of the microstructure and surface properties of Mg alloys. In the present work, a high-power diode laser has been used to study the microstructural and mechanical modifications that occur when laser surface treatments are applied to the surface of the AZ91D Mg alloy. Laser-beam power in a range of 375-600 W and laser scanning speeds of 45-60-90 mms-1 has been used to develop a range of laser surface melting treatments. By controlling the laser parameters, two types of surface modifications can be obtained. Complete laser surface melting takes place at high laser input energies whilst at low laser input energies, selective laser surface melting occurs with modification of only one phase in the microstructure of the alloy; the other phase remained unaffected. In terms of mechanical properties, the microstructural modifications introduced by the laser surface treatment implied a hardness homogenization along the melted region.

scholarly journals Effect of Thermal Fatigue on Microstructure and Mechanical Properties of H13 Tool Steel Processed by Selective Laser Surface Melting

Metals ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 773 ◽  
Author(s):  
Chao Meng ◽  
Chun Wu ◽  
Xuelei Wang ◽  
Jingyue Li ◽  
Rui Cao
Keyword(s):  
Mechanical Properties ◽  
Elevated Temperature ◽  
Thermal Fatigue ◽  
Room Temperature ◽  
Fatigue Behavior ◽  
Surface Melting ◽  
Laser Surface ◽  
Laser Surface Melting ◽  
Melted Zone ◽  
Thermal Fatigue Behavior

Selective laser surface melting, which brings together the bionic theory and the laser process, is an effective way to enhance the thermal fatigue behavior of materials. In this study, in order to examine the relationship between the mechanical properties and thermal fatigue behavior of materials processed by selective laser surface melting, the tensile properties at room temperature and elevated temperature of treated specimens and untreated specimens after different numbers of thermal fatigue cycles were investigated and compared. Moreover, the microstructure evolution and the microhardness of the laser-affected zone were investigated after different numbers of thermal fatigue cycles. The results show that microhardness of the laser-melted zone gradually decreases with an increasing number of thermal fatigue cycles; the number of thermal fatigue cycles has little effect on the grain size in the laser-melted zone, and the percentage of low-angle grain boundaries decreases with an increasing number of thermal fatigue cycles. The strength of specimens gradually decreases, whereas the fracture elongation gradually increases with an increasing number of thermal fatigue cycles at room temperature and elevated temperature. In addition, the stress distribution on the specimen surface during tensile test was investigated using the finite element method, and the results indicate that the stress transfer exists between the laser-affected zone and the untreated zone.

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