Results 51 to 60 of about 7,486,347 (328)

Ambient temperature as a trigger of preterm delivery in a temperate climate [PDF]

open access: yesJournal of Epidemiology and Community Health, 2016
Background Recent evidence suggests that elevated ambient temperatures may trigger preterm delivery. Since results from studies in temperate climates are inconclusive, we investigated the association between temperature and the risk of preterm birth in Flanders (Belgium).
Bianca Cox   +7 more
openaire   +5 more sources

Effect of heat treatment on microstructure and mechanical properties of low-alloy wear-resistant steel NM450

open access: yesMaterials Research Express, 2021
In this study, we investigated the effects of the quenching and tempering temperatures on the microstructure and mechanical properties of low-alloy wear-resistant steel NM450. The quenching temperatures were 870 °C–1200 °C, and held for 36 min.
Liang Liang   +5 more
doaj   +1 more source

Simulating the Effects of Substrate Pre-Heating on the Final Structure of Steel Parts Built by Laser Powder Deposition [PDF]

open access: yes, 2004
Tool steel parts built by laser powder deposition often present a heterogeneous distribution of properties caused by the complex structural transformations that occur during the deposition process.
Costa, L., Réti, T., Vilar, R.
core   +1 more source

Significant efficiency improvement of conventional tempering by a novel flash tempering technique

open access: yesJournal of Materials Research and Technology, 2023
A flash tempering process has been demonstrated for low-carbon low-alloy lath martensite, which includes heating the sample to 750 °C (Ac1: 752 °C), dwelling at 750 °C for 2 s, and quenching directly to room temperature.
Chao Ding   +10 more
doaj   +1 more source

Effect of Alloying Elements on the High-Temperature Tempering of Fe-0.3N Martensite

open access: yesActa Materialia, 2021
The precipitation behaviors of alloy nitrides during the high-temperature tempering of Fe-0.3mass%N-1mass%M (M: Cr, Mo, Mn, or Si) martensite obtained by gaseous nitriding and quenching was investigated.
Shao-Wen Young   +6 more
semanticscholar   +1 more source

Nanoscale austenite reversion through partitioning, segregation, and kinetic freezing: Example of a ductile 2 GPa Fe-Cr-C steel

open access: yes, 2012
Austenite reversion during tempering of a Fe-13.6Cr-0.44C (wt.%) martensite results in an ultrahigh strength ferritic stainless steel with excellent ductility.
Choi, P.   +5 more
core   +1 more source

Phase changes in 38 atom Lennard-Jones clusters. II: A parallel tempering study of equilibrium and dynamic properties in the molecular dynamics and microcanonical [PDF]

open access: yes, 2000
We study the 38-atom Lennard-Jones cluster with parallel tempering Monte Carlo methods in the microcanonical and molecular dynamics ensembles. A new Monte Carlo algorithm is presented that samples rigorously the molecular dynamics ensemble for a system ...
Calvo, F.   +3 more
core   +3 more sources

Hydrogen Diffusivity and Hydrogen Traps Behavior of a Tempered and Untempered Martensitic Steel

open access: yesHydrogen
The effect of tempering temperature and tempering time on the density of hydrogen traps, hydrogen diffusivity, and microhardness in a vanadium-modified AISI 4140 martensitic steel was determined. Tempering parameters were selected to activate the second,
Edgar López-Martínez   +5 more
doaj   +1 more source

Research Progress on Effects of Wheat Tempering Technology on Flour Quality

open access: yesLiang you shipin ke-ji, 2022
Wheat tempering is an important step in wheat milling process. Appropriate tempering method is beneficial to shorten tempering time, reduce microbial content, improve the quality of flour and by-products, reduce energy consumption and save production ...
YANG Shu-lin   +5 more
doaj   +1 more source

Ground-state energy and entropy of the two-dimensional Edwards-Anderson spin-glass model with different bond distributions [PDF]

open access: yes, 2011
We study the two-dimensional Edwards-Anderson spin-glass model using a parallel tempering Monte Carlo algorithm. The ground-state energy and entropy are calculated for different bond distributions.
A.J. Ramirez-Pastor   +39 more
core   +2 more sources

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