Results 51 to 60 of about 263,292 (331)

Influence of Y₂O₃ Content on Microstructure and Properties of Laser Alloying WC/Ni Metal Ceramic on 38CrMoAl Steel

Cailiao gongcheng, 2017
WC/Ni reinforced layers with different Y2O3 contents were fabricated on the surface of 38CrMoAl steel by laser alloying. The influence of Y2O3 content on the phase composition, microstructure, microhardness and tribological performance of the alloying ...
HAN Li-ying, WANG Cun-shan, FENG Qiao
doaj   +1 more source

Numerical Studies of Influencing Factors on the Homogeneity of the Powder Mixture during the Powder Spreading Process of Powder Bed Fusion–Laser Beam/Metal

Advanced Engineering Materials, EarlyView.
AISI 304L stainless steel powder is mixed with silicon nitride (Si3N4) powder and processed by PBF‐LB/M, allowing partial retention of Si3N4. The numerical approach effectively predicts the Si3N4 powder homogeneity and N content distribution on the powder bed. Recent studies have focused on the alloying of nitrogen (N) in high‐alloy stainless steels by
Yuanbin Deng, Ziping Sang, Jiali Zhang, Felix Radtke, Louis Becker, Simone Herzog, Sebastian Weber, Christoph Broeckmann   +7 more
wiley   +1 more source

Electric dipole moment of top quark and CP-violating asymmetries in gamma gamma -> t tbar [PDF]

, 1997
CP-violating asymmetries due to a possible electric dipole interaction of the top quark in the production and subsequent decay of top quark-top antiquark pair in photon-photon collisions are studied.
Poulose, P., Rindani, Saurabh D.
core   +2 more sources

Irradiation resistance mechanism of the CoCrFeMnNi equiatomic high-entropy alloy

Scientific Reports, 2021
When face-centered cubic (FCC) metals and alloys with low stacking fault energy (SFE) are irradiated by high-energy particles or deformed at high speed, stacking fault tetrahedra (SFTs), which are a type of vacancy cluster defect, are often formed ...
Q. Xu, H. Q. Guan, Z. H. Zhong, S. S. Huang, J. J. Zhao   +4 more
doaj   +1 more source

Development and Validation of a One‐Dimensional Finite Difference Simulation Scheme for Polymer Laser Powder Bed Fusion with Application to the Effect of the Inter Layer Time

Advanced Engineering Materials, EarlyView.
The study presents an efficient simulation approach for the polymer laser powder bed fusion process polymers process, validated with polyamide 12, polyamide 6, and polyetherketoneketone. It shows that inter layer time affects part density, with 90s yielding dense parts.
Claas Bierwisch, Bastien Dietemann, Moritz Grünewald, Christian Schlör, Johannes Rudloff   +4 more
wiley   +1 more source

Development of Ternary Magnesium Alloys for Laser Powder Bed Fusion: Optimizing Oxide Layer Thickness

Advanced Engineering Materials, EarlyView.
Additive manufacturing of magnesium alloys by laser is difficult because the melting point of the oxide layer is much higher than the evaporation temperature of the metal underneath. Making the oxide layer thinner can solve this problem. Alloying magnesium with strontium makes the oxide layer thinner, especially at 0.5 wt%.
Elmar Jonas Breitbach, Stefan Julmi, Sabine Behrens, Tatiana Blank, Arvid Abel, Nicole Emminghaus, Ludger Overmeyer, Christian Klose, Hans Jürgen Maier   +8 more
wiley   +1 more source

Observation of the significant reductions of electron density and electron temperature in a cascaded arc high density argon plasma with ammonia seeding comparing with nitrogen seeding by laser Thomson scattering approach

Nuclear Materials and Energy, 2022
In this work, the influences of ammonia (NH3) seeding on the electron density (ne) and electron temperature (Te) in a high-density cascaded arc argon plasma have been investigated by laser Thomson scattering. As NH3 seeding ratio increases from 0% to 2%,
Yong Wang, Jielin Shi, Yu Li, Cong Li, Chunlei Feng, Hongbin Ding   +5 more
doaj  

Mechanisms of Increasing Weld Depth during Temporal Power Modulation in High‐Power Laser Beam Welding

Advanced Engineering Materials, EarlyView.
Temporal power modulation increases weld depth in high‐power laser beam welding of dissimilar round bars by nearly 20% compared to same average continuously welded welding power. The mechanism of action also applies to sheet welding and depends on the inertia of keyhole depth for the modulated laser beam power.
Jan Grajczak, David Reynders, Christian Nowroth, Jens Twiefel, Jörg Wallaschek, Sarah Nothdurft, Jörg Hermsdorf, Stefan Kaierle   +7 more
wiley   +1 more source

Cu–Ni–Sn–Si alloys designed by cluster-plus-glue-atom model

Materials & Design, 2019
Segregation in the solidification process and discontinuous precipitation during aging cause the service and processing performance of Cu–Ni–Sn alloys deteriorating severely.
Q.X. Yu, X.N. Li, K.R. Wei, Z.M. Li, Y.H. Zheng, N.J. Li, X.T. Cheng, C.Y. Wang, Q. Wang, C. Dong   +9 more
doaj  

A Novel Approach to Produce Metal–Metal Composites by Leveraging Immiscibility: Laser Powder Bed Fusion of Nanosilver‐Dispersed Titanium

Advanced Engineering Materials, EarlyView.
Incorporating nanosized silver into titanium for antimicrobial materials exploits the metastable miscibility gap between silver and titanium. Silver nanoparticles are synthesized via pulsed laser ablation in liquid. Silver addition refines the microstructure, increases hardness by 30%, and reduces Staphylococcus capitis microbial adhesion by 70%, with ...
Hamed Shokri, Silja‐Katharina Rittinghaus, Janett Schmelzer, Jessica Bertrand, Bilal Gökce   +4 more
wiley   +1 more source