Results 201 to 210 of about 2,183,502 (251)

Role of retained austenite with different morphologies on sub-surface fatigue crack initiation in advanced bainitic steels

, 2020
We describe here the distinct high cycle fatigue properties of advanced bainitic steels to elucidate the significant role of retained austenite with different morphologies on sub-surface fatigue crack initiation process.
G. Gao, R. Liu, Kun Wang, Xiao-lu Gui, R. Misra, B. Bai   +5 more
semanticscholar   +1 more source

Initiation of motion of quartz sand grains

1991
Direct observation at a limited range of wind speeds of grain behaviour near the upwind edge of a sand deposit (by means of high-speed film) shows that disturbed grains usually, but not always, roll before taking off into reptation or saltation. Time-averaged description of the population of initial motions is deficient because of the importance of ...
B. B. Willetts, I. K. McEwan, M. A. Rice
openaire   +1 more source

Effect of initial grain size on sintering trajectories

Acta Materialia, 2000
Sintering trajectories were simulated for different initial grain sizes assuming grain-boundary diffusion as densification mechanism and either pore drag or intrinsic grain-boundary mobility as grain growth mechanisms. Computation of comparable sintering trajectories for initial grain sizes between 10 nm and 250 nm necessitated an adjustment of the ...
J. Kanters, U. Eisele, J. Rödel
openaire   +1 more source

Temperature induced smoothing of initially fractal grain boundaries

Scripta Materialia, 1996
Recently the effect of serrated or rugged grain boundaries on the mechanical properties of alloys and the numerical characterization of such a geometrically irregular microstructure by means of the concept of fractal geometry has attracted great attention. It has been reported that the generation of serrated or rugged grain boundaries, e.g.
P. Streitenberger, D. Förster, G. Kolbe, P. Veit   +3 more
openaire   +1 more source

Grain size ratio may be crucial for the fluid initiation of martian sand grains

Icarus, 2021
Abstract The active Aeolian sand movement on the Martian surface has been puzzling scientists for several decades because the existing theories do not support the initiation of sand grains under the current Martian environment. In this study, I theoretically calculated the fluid threshold (u⁎ft) for the initiation of sand grain movement by ...
openaire   +1 more source

Initial cutting conditions by abrasive grain fixed flexibly

The International Journal of Advanced Manufacturing Technology, 2008
In the paper, the initial cutting conditions by an abrasive grain fixed flexibly have been described. These conditions have been determined by incision angle at the beginning of machining zone as well as the occurring phenomena resulting from a mechanical cooperation of abrasive grain with machined material. It has been revealed that the incision angle
Zdzislaw Pluta, Tadeusz Hryniewicz
openaire   +1 more source

Inhibition of cracking by grain boundary modification in a non-weldable nickel-based superalloy processed by laser powder bed fusion

, 2020
A TiC nanoparticle modified non-weldable nickel-based superalloy Inconel 738LC has been fabricated via laser powder bed fusion. The formation of refined grains with a larger high angle grain boundary length density and zigzag grain boundaries inhibits ...
Wenzhe Zhou, G. Zhu, Rui Wang, Chao Yang, Yusheng Tian, Liang Zhang, A. Dong, Donghong Wang, D. Shu, Bao-de Sun   +9 more
semanticscholar   +1 more source

A thermokinetic description of nanoscale grain growth: Analysis of initial grain boundary excess amount

Scripta Materialia, 2010
A thermokinetic description was performed for nanoscale grain growth by analyzing the effect of grain boundary (GB) segregation on the initial GB excess amount, Γ b . Compared with the model assuming a linear relation between Γ b and grain size (i.e. Γ b Γ b0 , the saturated value) [Chen et al., Acta Mater.
M.M. Gong, F. Liu, K. Zhang
openaire   +1 more source

Influence of the Grain Size on the Fatigue Initiation Life Curve

International Journal of Fatigue, 2021
M. Mlikota, K. Dogahe, S. Schmauder, Ž. Božić   +3 more
semanticscholar   +1 more source

Short‐term market impact of Black Sea Grain Initiative on four grain markets

Journal of Futures Markets
AbstractThis paper examines the short‐term market reaction of four agricultural commodities to the Russian–Ukraine war and various stages of the Black Sea Grain Initiative Agreement. Using an event study, the results show a positive abnormal return for the agricultural grain markets with the outbreak of the war and the nonrenewal of the Black Sea Grain
openaire   +1 more source