Surface Melting of Cast Iron With a High Power Laser Beam

1981 ◽  
Vol 8 ◽  
Author(s):  
Ylva Nilsson
Keyword(s):  
Cast Iron ◽  
Laser Beam ◽  
Partial Melting ◽  
High Power ◽  
Surface Hardening ◽  
Beam Diameter ◽  
High Power Laser ◽  
Power Laser ◽  
Scanning Rate ◽  
Alloy Addition

ABSTRACTAn investigation is done on partial surface hardening and alloying on cast iron by means of a high power laser beam. Samples of cast iron have been covered with alloying material i.e. Ti, Cr, Si, V and Nb respectively. The samples were irradiated with a 2.5 kW laser beam. A partial melting of the surface occured and the alloys were dissolved. The carbide structure in the resolidified part was governed by the alloy addition. The carbide structure was metallographicly analysed. The effect of different parameters as beam diameter, scanning rate, power and alloy content have been investigated and the crack frequency has been evaluated.

Surface Hardening of a Vermicular Cast Iron Used for Integral Molding Valve Seat by High Power Laser

2013 ◽  
Vol 456 ◽  
pp. 474-477
Author(s):  
Ming Pang ◽  
Wei He ◽  
Chang Zhen Liu ◽  
Xu Lan Wang ◽  
Xue Bin Kang
Keyword(s):  
Cast Iron ◽  
High Power ◽  
Laser Processing ◽  
Surface Hardening ◽  
Processing Conditions ◽  
High Power Laser ◽  
Power Laser ◽  
Valve Seat ◽  
Melted Zone ◽  
Scanning Electron

Surface hardening intergal molding valve seat of a vermicular cast Iron was done by Nd:YAG high power laser. The effect of laser parameters on microstructure, hardness and surface quality were conducted by scanning electron microscopy (SEM) ,optical microscopy (OM) and microhardness tester. The results show that The hardening layer of free defect can be obtained with suitable laser processing conditions. The shape of crescent can be observed in the laser hardening layer.The hardening layer consists of melted zone and heat-affected zone.Ledeburite, martensite and remainder austenite can be observed in the melted zone.The heat-affected zone consists of martensite and remainder austenite with retained vermicular graphite.Laser hardening layer has no-uniformity distribution of rigidity due to no-equilibrium calefaction and cooling.The defect of sunen disfigurement can be restrained by reducing heat-input in the ending zone.

Use of diffraction fringes induced by a knife-edge to characterize a high power laser beam

1993 ◽  
Vol 24 (5) ◽  
pp. 193-199
Author(s):  
L Junchang ◽  
C Vialle ◽  
J Merlin
Keyword(s):  
Laser Beam ◽  
High Power ◽  
Knife Edge ◽  
High Power Laser ◽  
Power Laser

Improvement of Build Speed and Quality of H13 Tool Steel Processed by Laser-Beam Powder Bed Fusion with a High-Power Laser

2021 ◽  
Vol 68 (10) ◽  
pp. 415-421
Author(s):  
Takashi MIZOGUCHI ◽  
Takaya NAGAHAMA ◽  
Makoto TANO ◽  
Shigeru MATSUNAGA ◽  
Takayuki YOSHIMI ◽  
...  
Keyword(s):  
Laser Beam ◽  
Tool Steel ◽  
High Power ◽  
Powder Bed Fusion ◽  
High Power Laser ◽  
Power Laser ◽  
Powder Bed ◽  
H13 Tool Steel

On the Interaction of High-Power Laser Beam with Metal Targets

1984 ◽  
pp. 681-691
Author(s):  
M. Cantello ◽  
V. Donati ◽  
L. Garifo ◽  
R. Menin ◽  
F. Pandarese ◽  
...  
Keyword(s):  
Laser Beam ◽  
High Power ◽  
High Power Laser ◽  
Power Laser

Temporal wavefront stability of an ultrafast high-power laser beam

2009 ◽  
Vol 48 (4) ◽  
pp. 770 ◽  
Author(s):  
Juan M. Bueno ◽  
Brian Vohnsen ◽  
Luis Roso ◽  
Pablo Artal
Keyword(s):  
Laser Beam ◽  
High Power ◽  
High Power Laser ◽  
Power Laser
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