scholarly journals Surface oxidation of porous ZrB2-SiC ceramic composites by continuous-wave ytterbium fibre laser

2015 ◽  
Vol 357 ◽  
pp. 1982-1990 ◽  
Author(s):  
Dayang Salyani Abang Mahmod ◽  
Nicolas Glandut ◽  
Amir Azam Khan ◽  
Jean-Claude Labbe
Keyword(s):  
Continuous Wave ◽  
Surface Oxidation ◽  
Ceramic Composites ◽  
Fibre Laser ◽  
Sic Ceramic ◽  
Ytterbium Fibre Laser

Effect of in-situ heat treatment and process parameters on the laser-deposited IN718 microstructure and mechanical properties

MRS Advances ◽  
2020 ◽  
Vol 5 (23-24) ◽  
pp. 1245-1257
Author(s):  
BN Masina ◽  
S Skhosane ◽  
S Hoosain ◽  
M Tlotleng
Keyword(s):  
Heat Treatment ◽  
Laser Scanning ◽  
Continuous Wave ◽  
Fibre Laser ◽  
Hardness Profile ◽  
Micro Hardness ◽  
Direct Laser ◽  
Ytterbium Fibre Laser ◽  
In Situ Heat Treatment

ABSTRACTThe direct laser-deposited Inconel 718 (IN718) specimens were produced using 1073 nm, high power continuous wave (CW), IPG Ytterbium fibre laser and in-situ heat treatment. The laser power and in-situ heat treatment temperature were fixed while varying the laser scanning speed from 0.83 to 2.50 cm/s. The microstructure and micro-hardness of the IN718 specimens were characterized using an optical microscope (OM), scanning electron microscopy (SEM) equipped with an energy-dispersive X-ray spectroscopy (EDS or EDX) and Vickers system. The microstructure of the specimens consists of γ-matrix as the primary phase, Nb-rich particles, constitutional liquation cave, liquation cracking and ductility-dip cracks. It was found that the micro-hardness profile of the IN718 specimens was gradually increased with the increase of the distance from the surface.

Study of Effect on Tensile Stress Test from Distortion of Fibre Laser Welded Ti6Al4V Using FEA

2011 ◽  
Vol 314-316 ◽  
pp. 1889-1894
Author(s):  
Yu Fan ◽  
Philip Shipway ◽  
Geoff Tansley ◽  
Zheng Chen
Keyword(s):  
Tensile Stress ◽  
Laser Welding ◽  
Tensile Test ◽  
Thin Plate ◽  
Stress Level ◽  
Continuous Wave ◽  
Stress Test ◽  
Welding Distortion ◽  
Fibre Laser

Distortion is one type of defect in the weld, which is troublesome for some reasons, especially in thin plate welding. Distortion was found in fibre laser welding processing for 0.7mm thickness Ti6Al4V plate. The purpose of this paper is to understand and evaluate the effect of distortion on stress level by FEA and tensile test. A group of 0.7mm Ti6Al4V plates welded using continuous wave fibre laser. FEA models were established for fibre laser welded Ti6Al4V in abaqus 6.7.

scholarly journals Continuous-wave oscillation of holmium-doped silica fibre laser

1989 ◽  
Vol 25 (9) ◽  
pp. 593 ◽  
Author(s):  
D.C. Hanna ◽  
R.M. Percival ◽  
R.G. Smart ◽  
J.E. Townsend ◽  
A.C. Tropper
Keyword(s):  
Continuous Wave ◽  
Fibre Laser ◽  
Wave Oscillation ◽  
Silica Fibre

Analysis of Toughening Mechanisms of ZrO2/Nano-SiC Ceramic Composites

2004 ◽  
Vol 38 (3) ◽  
pp. 227-241 ◽  
Author(s):  
Ai Kah Soh ◽  
Dai-Ning Fang ◽  
Zhao-Xu Dong
Keyword(s):  
Ceramic Composites ◽  
Toughening Mechanisms ◽  
Sic Ceramic

Helium Permeability Measurement of SiC Ceramic Composites for Advanced Reactor Application

2013 ◽  
Author(s):  
Weiqian Zhuo ◽  
Fenglei Niu ◽  
Yungan Zhao ◽  
Houbo Qi ◽  
Zulong Hao ◽  
...  
Keyword(s):  
Low Cost ◽  
Ceramic Composites ◽  
Test System ◽  
Fiber Reinforced ◽  
Water Displacement ◽  
Coated Fiber ◽  
Sic Ceramic ◽  
Carbon Coated ◽  
The Difference ◽  
Reactor Application

Permeability of helium gas of Silicon carbide ceramic composites material, which is one of the most important properties in application of SiC composite for advanced reactors, is studied by using a simple, low-cost test system. The test system can not only qualitatively determine whether the sample is permeable or not, but also quantitatively measure the permeability for the permeable ones by water displacement. The tests are conducted with low pressure in room temperature. The permeability of the SiSiC composite depends on the preparation method. In four flat-plate materials prepared by different processes for the test, the splint based SiSiC and cordierite coated fiber reinforced SiSiC are hermetic, the permeability of uncoated fiber reinforced SiSiC and CVD carbon coated fiber reinforced SiSiC are 0.216cm2/s and 0.109cm2/s, which imply that the permeability is cut in half with the coating. The samples are scanned under SEM to analyze their microscopic structures and verified that the difference of permeability is related to their coatings as well as the pores and cracks.

Continuous-wave Cr4+: Mg2SiO4laser pumped by neodymium fibre-laser radiation

1997 ◽  
Vol 27 (9) ◽  
pp. 751-752
Author(s):  
Evgenii M Dianov ◽  
Igor' A Bufetov ◽  
V I Karpov ◽  
M V Grekov ◽  
A M Prokhorov
Keyword(s):  
Laser Radiation ◽  
Continuous Wave ◽  
Fibre Laser

Fabrication of laminated SiCw/SiC ceramic composites by CVI

2013 ◽  
Vol 33 (10) ◽  
pp. 1701-1706 ◽  
Author(s):  
Yupeng Xie ◽  
Laifei Cheng ◽  
Liangjun Li ◽  
Hui Mei ◽  
Litong Zhang
Keyword(s):  
Ceramic Composites ◽  
Sic Ceramic
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