Results 51 to 60 of about 245,180 (301)

Thermodynamic Pathways of Nonequilibrium Solidification in Wire‐Arc Additive Manufacturing Fe‐Based Multicomponent Alloy Structures

Advanced Engineering Materials, EarlyView.
Geometry‐driven thermal behavior in wire‐arc additive manufacturing (WAAM) influences microstructural evolution during nonequilibrium solidification of a chemically complex Fe–Cr–Nb–W–Mo–C nanocomposite system. By comparing different deposits configurations, distinct entropy–cooling rate correlations, segregation, and carbide evolution are revealed ...
Blanca Palacios, Anthony Gonzalez, Aleksander Aleman, Tyler Dolmetsch, Tanaji Paul, Arvind Agarwal   +5 more
wiley   +1 more source

New insights into the formation mechanism of the multicomponent carbides (Nb, M)C (M = Ti, Cr and Mn)

Journal of Materials Research and Technology
Combining first-principles calculations and classical nucleation theory, the results of elemental doping on the structure, electrons and stability of niobium carbides are investigated.
Shi Cheng, Tingping Hou, Dong Zhang, Zhihui Wang, Chaochao Yin, Xianming Pan, Xiaojie Liu, Shue Hu, Kaiming Wu   +8 more
doaj   +1 more source

Temperature effects on material characteristics [PDF]

, 1960
Some of the physical properties of the main elements of interest in high temperature technology are reviewed. Some general trends emerge when these properties are viewed as a function of melting point, but there are a few notable exceptions. Titanium,
Kennedy, A. J., Murphy, A. J.
core  

Thermomechanical Fatigue and Creep–Fatigue Interaction of Inconel 718 Additively Manufactured by Laser Beam Powder Bed Fusion

Advanced Engineering Materials, EarlyView.
Thermomechanical fatigue tests of laser beam powder bed fusion (PBF‐LB) Inconel 718 show that the additively manufactured material reaches almost the lifetimes of conventionally‐rolled material under no‐dwell conditions. Introducing dwell times at the maximum temperature markedly reduces the lifetimes due to pronounced grain boundary sliding associated
Stefan Guth, Tomáš Babinský, Jan Lars Riedel, Wen Hao Kan, Aijun Huang, Martin Heilmaier, Ivo Šulák   +6 more
wiley   +1 more source

Near-Infrared Spatial Self-Phase Modulation in Ultrathin Niobium Carbide Nanosheets

Frontiers in Physics, 2021
Spatial self-phase modulation (SSPM) as a purely coherent non-linear optical effect (also known as Kerr effect) can support strong broadband phase modulation, which is essential for all-optical applications.
Si Xiao, Yi-lin He, Yu-lan Dong, Yi-duo Wang, Li Zhou, Xue-jun Zhang, Ying-wei Wang, Jun He   +7 more
doaj   +1 more source

Physical metallurgy of modern creep-resistant steel for steam power plants: microstructure and phase transformations [PDF]

, 2016
The fact that the microstructure of steel depends on its composition and the heat treatment given to it has been heavily exploited in the design of steel for power plant applications.
Igwemezie, Victor C., Mark, U., Ugwuegbu, C. C.   +2 more
core   +3 more sources

NIOBIUM CARBIDE COATING OF GRAPHITE TUBES [PDF]

, 1958
Graphite tubes having a length-to-bore-diameter ratio of 430 were coated on the inside with uniform adherent layers of niobium carbide in thicknesses of 0.002 and 0.004 in. Intimate conformity to the graphite surface and improved uniformity were obtained by reacting NbCl/sub 5/ vapor with the graphite under pressuretemperature conditions ...
Blocher, J.M. Jr., Browning, M.F., Leiter, D.P. Jr., Campbell, I.E.   +3 more
openaire   +2 more sources

Removing Oxide Layers and Retaining Oxide‐Free Steel Surfaces by Polishing in Oxygen‐Free Atmosphere

Advanced Engineering Materials, EarlyView.
In this study, the efficacy of wet mechanical polishing under an oxygen‐free atmosphere for deoxidation and the retention of an oxide‐free steel surface are elucidated using X‐ray photoelectron spectroscopy. The methodology proved successful; however, the results were highly dependent on the preparation of the solvents used to clean the samples after ...
Friedrich Bürger, Lienhard Wegewitz, Wolfgang Maus‐Friedrichs   +2 more
wiley   +1 more source

High‐Temperature Nanoindentation of Metals: Assessing Thermal Drift, Frame Compliance, and Chemical Composition Effects on the Reported Mechanical Properties

Advanced Engineering Materials, EarlyView.
Do not let thermal drift and instrument artifacts deceive high‐temperature nanoindentation results. We compare classical Oliver–Pharr and automatic image recognition analyses across steels and a Ni alloy to quantify these effects. Accounting for artifacts reveals systematic softening with temperature, while Cr and Ni additions boost resistance ...
Velislava Yonkova, Steffen Brinckmann, Ruth Schwaiger   +2 more
wiley   +1 more source

On the Vacuum Reduction of Niobium Pentoxide with Niobium Carbide

Journal of the Japan Institute of Metals, 1962
Using the vacuum process, carbide reduction of niobium pentoxide due to the following reaction was investigated experimentally: Nb/sub 2/O/sub 5/ + 5 NbC = 7 Nb + 5 CO. The mixing ratio of Nb/sub 2/O/sub 5//NbC was varied from 33/67 to 45/55. By means of fluctuation measurements of pressure and temt the reaction began to proceed rapidly above 1700 un ...
Hirozô Kimura, Yasuo Sasaki
openaire   +2 more sources