Melting and crystallization of nonmetallic inclusions and steel matrix in the course of laser treatment

2010 ◽  
Vol 46 (3) ◽  
pp. 365-370
Author(s):  
S. I. Gubenko
Keyword(s):  
Laser Treatment ◽  
Nonmetallic Inclusions ◽  
Steel Matrix ◽  
Melting And Crystallization

A model approach for considering nonmetallic inclusions in the calculation of the local tooth root load-carrying capacity of high-strength gears made of high-quality steels

2019 ◽  
Vol 233 (21-22) ◽  
pp. 7309-7317 ◽  
Author(s):  
D Fuchs ◽  
S Schurer ◽  
T Tobie ◽  
K Stahl
Keyword(s):  
Carrying Capacity ◽  
Nonmetallic Inclusions ◽  
High Strength ◽  
Steel Matrix ◽  
Tooth Root ◽  
Load Carrying Capacity ◽  
Strength Based ◽  
Load Carrying ◽  
Root Strength ◽  
Gear Steels

Demands for higher performance have caused a need for improved component characteristics, e.g. through surface strengthening of gears and increased cleanliness of gear steels. Unfortunately, a resultant drawback is that cracks in such high-strength gears are more often initiated in the material matrix at nonmetallic inclusions and not at the surface. In standardized calculation methods, the degree of cleanliness of steels is not yet directly correlated to the tooth root load-carrying capacity. This paper considers the effects of nonmetallic inclusions in the steel matrix on the tooth root strength based on the theoretical approach of Murakami.

scholarly journals Effects of Powder Atomisation on Microstructural and Mechanical Behaviour of L-PBF Processed Steels

Metals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1474
Author(s):  
Marawan Abdelwahed ◽  
Riccardo Casati ◽  
Sven Bengtsson ◽  
Anna Larsson ◽  
Martina Riccio ◽  
...  
Keyword(s):  
Mechanical Behaviour ◽  
Nonmetallic Inclusions ◽  
Steel Matrix ◽  
Laser Powder Bed Fusion ◽  
Powder Preparation ◽  
Steel Alloys ◽  
Powder Bed ◽  
Treatment Conditions ◽  
Tempering Treatment

In this research, steel alloys based on the Fe-Cr-Mo, Fe-Cr-Mn and Fe-Cr-Mo-Mn-Ni systems have been designed, produced by different atomisation techniques, and processed by laser powder bed fusion (L-PBF) to investigate their microstructural and mechanical behaviour. Both gas atomisation and water atomisation were considered for powder preparation. The resulting different flowability of powders, hence a different densification behaviour during processing, could be compensated by tuning the L-PBF parameters and by the application of a post treatment to improve flowability of the water atomised powders. In agreement with thermodynamic calculations, small-size oxide-based nonmetallic inclusions of the type SiO2, MnO-SiO2, Cr2O3-SiO2 were found within the steel matrix and on the fracture surfaces of the water atomised L-PBF alloys, featuring higher amounts of oxygen than the gas-atomised steels. Analyses on microstructure and hardness of the hardenable as-built steels suggested that during laser processing, the multilayer L-PBF structure undergoes an in-situ tempering treatment. Furthermore, the mechanical properties of the L-PBF steels could be widely tuned depending on the post-thermal treatment conditions.

Regarding the mechanism of formation of nonmetallic inclusions conglomerates of system Al2O3-MgO

2019 ◽  
Vol 75 (12) ◽  
pp. 1341-1351
Author(s):  
A. A. Safronov ◽  
V. S. Dub ◽  
V. V. Orlov ◽  
K. L. Kosyrev ◽  
A. S. Loskutov ◽  
...  
Keyword(s):  
Nonmetallic Inclusions ◽  
Mechanism Of Formation

Q-switched ruby laser treatment of congenital nevi

1995 ◽  
Vol 131 (5) ◽  
pp. 621-623 ◽  
Author(s):  
D. J. Goldberg
Keyword(s):  
Laser Treatment ◽  
Ruby Laser
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