Response of silicon nitride ceramics subject to laser shock treatment

2021 ◽  
Author(s):  
P. Shukla ◽  
X. Shen ◽  
Ric Allott ◽  
Klaus Ertel ◽  
S. Robertson ◽  
...  
Keyword(s):  
Silicon Nitride ◽  
Shock Treatment ◽  
Laser Shock ◽  
Nitride Ceramics ◽  
Laser Shock Treatment

Methods for the suppression of “residual stress holes” in laser shock treatment

2021 ◽  
pp. 102486
Author(s):  
Guoxin Lu ◽  
Lu Wang ◽  
Heng Li ◽  
Zhong Ji ◽  
Qiang Wang ◽  
...  
Keyword(s):  
Residual Stress ◽  
Shock Treatment ◽  
Laser Shock ◽  
Laser Shock Treatment

Outlooks in laser work hardening for characteristics increase of parts obtained by selective laser melting

2018 ◽  
Vol 2018 (7) ◽  
pp. 32-37
Author(s):  
Д. Мельников ◽  
D. Melnikov ◽  
Е. Калёнова ◽  
E. Kalyonova ◽  
Зо Зо Йе Мьят ◽  
...  
Keyword(s):  
Surface Layer ◽  
Selective Laser Melting ◽  
Work Hardening ◽  
Shock Treatment ◽  
Fatigue Properties ◽  
Laser Shock ◽  
Laser Melting ◽  
Near Surface ◽  
Hybrid Technology ◽  
Laser Shock Treatment

The paper deals with the development of a new hybrid technology – 3D laser work hardening which consists in the integration of laser shock treatment (laser work hardening) into the process of selective laser melting. The technology offered will allow obtaining an area of compressing residual stresses in a near surface layer and achieving the improvement of mechanical and fatigue properties of parts manufactured. In this paper the aluminum alloy samples were processed with laser work hardening with the use of uncommon absorbing and transparent layers (foil and glass) which are necessary for the introduction selective laser melting in a plant. Modes of laser work hardening were also investigated which may be used in the hybrid technology offered.

Microstructure, toughness and flexural strength of self-reinforced silicon nitride ceramics doped with yttrium oxide and ytterbium oxide

2001 ◽  
Vol 201 (2) ◽  
pp. 238-249 ◽  
Author(s):  
Y. S. Zheng ◽  
K. M. Knowles ◽  
J. M. Vieira ◽  
A. B. Lopes ◽  
F. J. Oliveira
Keyword(s):  
Silicon Nitride ◽  
Flexural Strength ◽  
Yttrium Oxide ◽  
Ytterbium Oxide ◽  
Nitride Ceramics

Effect of α/β phase ratio on microstructure and mechanical properties of silicon nitride ceramics

2001 ◽  
Vol 16 (8) ◽  
pp. 2264-2270 ◽  
Author(s):  
Hirokazu Kawaoka ◽  
Tomohiko Adachi ◽  
Tohru Sekino ◽  
Yong-Ho Choa ◽  
Lian Gao ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Silicon Nitride ◽  
Phase Ratio ◽  
Phase Content ◽  
Sintering Process ◽  
Β Phase ◽  
Nitride Ceramics ◽  
Pulse Electric ◽  
Sintering Condition ◽  
Sintered Materials

Highly densed silicon nitride ceramics with various α/β phase ratios were produced by pulse electric current sintering process. The β-phase content of Si3N4 in sintered materials varied from 20 to 100 wt% depending on the sintering condition. The microstructure was observed by scanning electron microscopy and investigated by image analysis. Young's modulus, hardness, fracture toughness, and strength were strongly dependent on the α/β phase ratio. The fracture toughness increased from 4.6 MPa m1/2 for 20-wt% b-phase content to 8.2 MPa m1/2 for 95-wt% β-phase content, and the fracture strength showed a maximum value of about 1.6 GPa at 60-to-80-wt% β-phase content.

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