Connect with us

Material

Strain-induced precipitation in Ti microalloyed steel by two-stage controlled rolling process

Publication date: November–December 2020

Source: Journal of Materials Research and Technology, Volume 9, Issue 6

Author(s): Songjun Chen, Liejun Li, Zhengwu Peng, Xiangdong Huo, Jixiang Gao

Republished by Plato

Published

on

open access

Abstract

Strain-induced precipitation kinetics and precipitates’ characteristics in a Ti microalloyed steel subjected to a two-stage controlled rolling process, simulating rough and finish rolling process of industrial production, were quantitatively investigated by stress relaxation experiments and transmission electron microscopy (TEM), as well as inductively coupled plasma-atomic emission spectroscopy (ICP-AES). In the present work, precipitation during the cooling stage after rough rolling was taken into consideration for the first time. It was found that a small amount of Ti-bearing precipitates, consuming about 10% of the elemental Ti, were formed on dislocations after rough rolling and cooling to 900 °C. The obtained precipitation-time-temperature (PTT) curves exhibited a classic C shape with a nose temperature of 900 °C and the shortest incubation time of 60 s. The PTT curves moved to the lower left by the introduction of 20% deformation at 1050 °C, which was attributed to more nucleation sites for strain-induced precipitation and the decrease of Ti concentration in deformed austenite. During the stress relaxation stage, strain-induced precipitates preferentially nucleated on dislocations and sub-boundaries and were identified as TiC particles. The mean size of precipitated TiC particles increased from 10.2 ± 2.1 to 25.2 ± 2.8 nm, as the holding time was increased from 100 to 1800 s at 900 °C. When the holding time exceeded 600 s the migration of austenite grain boundaries could not be completely inhibited due to the coarsening of precipitates. Isothermal treatment at 900 °C with a holding time of 60–100 s is suggested here as a viable combination for the processing of the 0.05C-0.21Si-1.05Mn-0.13Ti (wt. %) steel due to the shortest incubation time period and effective pinning of grain boundaries by strain-induced precipitates.

Keywords

Ti microalloyed steel

Strain-induced precipitation

TiC

PTT curves

TEM

© 2020 The Author(s). Published by Elsevier B.V.

Source: https://www.sciencedirect.com/science/article/pii/S2238785420320068?dgcid=rss_sd_all

Material

Synthesis and optical properties of alizarin yellow GG-Cu(II)-PVA nanocomposite film as a selective filter for optical applications

Publication date: Available online 4 January 2021

Source: Journal of Materials Research and Technology

Author(s): Mona M. Khalil, Adly H. El-Sayed, M.S. Masoud, E.M. Mahmoud, Mahmoud A. Hamad

Republished by Plato

Published

on


Elsevier

Available online 4 January 2021

Journal of Materials Research and Technology

open access

Abstract

In this paper, alizarin yellow GG (AYGG) – CuCl2 doped with polyvinyl alcohol (PVA) has been successfully synthesized. This composite has spherical shape particles with amorphous structure. Thermal analysis indicates that there is an endothermic change, which is related to the glass transition. In addition, the coordination between the transition metal Cu(II) ion and AYGG (ligand) occurs via oxygen atoms of phenolic hydroxyl groups and a nitrogen atom of azo moiety from the two ligand molecules. AYGG – Cu(II) doped PVA has high dispersion for high frequency lights and vice versa for low frequency lights. Therefore, it is concluded that AYGG – Cu(II) doped PVA film is suggested as a selective filter for ultraviolet and high frequency visible lights for many optical applications like protective shields for solar cells and packaging.

Keywords

Alizarin yellow GG

UV-Vis spectra

FTIR spectra

refractive index

© 2021 The Author(s). Published by Elsevier B.V.

Source: https://www.sciencedirect.com/science/article/pii/S2238785420321815?dgcid=rss_sd_all

Continue Reading

Material

Factors affecting the formation of plasma on Fe, Cu and W electrodes using an electrochemical reaction in an aqueous environment with high-voltage DC

Publication date: Available online 5 January 2021

Source: Journal of Materials Research and Technology

Author(s): Tran Van Cong, Nguyen Duc Hung, Lai Xuan Bach, Tran van Hung, Nam Nguyen Dang

Republished by Plato

Published

on


Elsevier

Available online 5 January 2021

Journal of Materials Research and Technology

open access

Highlights

Formation of plasma on Fe, Cu and W electrodes using electrochemical reaction in aqueous environment.

Plasma appears at a high voltage of about 15 kV with the earliest appearance on W electrode.

Water-soluble plasma on W electrode produces more gases than those in Fe and Cu electrodes.

The size of Cu and Fe nanoparticles is approximate 200 nm, whereas 100 and 500 nm were for W.

Abstract

Plasma creation technology in an aqueous environment is being evaluated for research and practical applications, particularly in the field of materials and nano processing, as well as environmental pollution treatment. Important factors that influence the appearance of plasma when performing electrolysis by high-voltage DC (direct current) in aqueous environments are voltage, distance between electrodes, pH, conductivity and ambient temperature, as well as the nature of the electrode, which has been suggested by concurrent works to be the controlling factor of the other ones. Specifically, it is indicated that the plasma typically appears at a high voltage of about 15 kV and a distance between electrodes of 200 mm, with the earliest appearance occurring with the tungsten (W) electrode. Additionally, pH, conductivity and temperature variations for effective plasma creation have been found in all investigated electrodes. Finally, it has been found that the water-soluble plasma on the W electrode produces more gas than those in iron (Fe) and copper (Cu) electrodes. After the reactions, the lowest dissolution belonging to W electrode could be attributed to the inertness of W in comparison with Fe and Cu, resulting in a minimal value of the zeta potential. In addition, the size of Cu and Fe nanoparticles achieved in the investigated solution was approximately 200 nm, whereas W nanoparticles were two separate sizes of 100 and 500 nm. Therefore, this work could offer the needed agency for technological applications in industrial wastewater treatment and high-purity nanoparticle fabrication.

Keywords

Plasma electrode

Copper

Iron

Tungsten

High voltage electrochemistry

© 2021 The Author(s). Published by Elsevier B.V.

Source: https://www.sciencedirect.com/science/article/pii/S2238785420321748?dgcid=rss_sd_all

Continue Reading

Material

Selenium nanoparticles synthesized using an eco-friendly method: Dye decolorization from aqueous solutions, cell viability, antioxidant, and antibacterial effectiveness

Publication date: Available online 5 January 2021

Source: Journal of Materials Research and Technology

Author(s): Badreah A. Al Jahdaly, Najlaa S. Al-Radadi, Ghada M.G. Eldin, Albandary Almahri, M.K. Ahmed, Kamel Shoueir, Izabela Janowska

Republished by Plato

Published

on


Elsevier

Available online 5 January 2021

Journal of Materials Research and Technology

open access

Abstract

Selenium nanoparticles (SeNPs) were fabricated using a green microwave technique in the presence of ascorbic acid. The morphological features indicated that the semi-spherical SeNPs with a diameter 8.5-22nm were configured in agglomerated spherical shapes with diameters around 0.47-0.71 μm. Furthermore, the removal of Fuchsin Basic dye from aqueous solutions was investigated upon variation of concentration of SeNPs. The degradation efficiency achieved 100 % for 10 mg of SeNPs after 34 min of visible light irradiation time. The antioxidant activity was tested via DPPH radical scavenging assay and displayed that the highest scavenging capacity (311.1±15.72 mg/g) was achieved by SeNPs at a concentration of 106.25 mg/mL. Otherwise, the cell viability of SeNPs through human fibroblasts cell lines in-vitro was reduced to be 75.1±3.8 % with nanoparticle concentration around 500 μg/mL. The antibacterial activity was investigated against gram-negative and gram-positive bacteria such as Escherichia coli (E.coli), Pseudomonas aeruginosa (P. aeruginosa), Klebsiella pneumoniae (K. pneumonia), Staphylococcus aureus (S. aureus), and Bacillus subtilis (B. subtilis) bacteria after one day of exposure. It was illustrated that SeNPs did not display an activity towards Staphylococcus aureus, while it possessed the highest one against Escherichia coli with MBC of 50 ± 1.76 μg/mL compared with 26 ± 0.6 μg/mL for the standard antibiotic. These tremendous properties of SeNPs indicate that manipulating multifunctional nanoparticles for versatile wound and skin treatment applications is highly encouraging.

Keywords

SeNPs

ascorbic acid

dye removal

antibacterial

antioxidant

© 2020 Published by Elsevier B.V.

Source: https://www.sciencedirect.com/science/article/pii/S2238785420321761?dgcid=rss_sd_all

Continue Reading
News2 days ago

Cansortium Inc. Appoints CEO Robert Beasley to Board of Directors

Heartland4 days ago

Looking for something similar to FEALS but less pricey.

Heartland1 day ago

is it possible for accidental thc product in my cbd cigarettes?

News5 days ago

Florida Lawmakers Pushing For Cannabis Law Changes And Reform

Heartland5 days ago

My new ‘Up in Smoke’ 40th Anniversary Rolling Tray! 🌱🎱😎 Love it! High Quality and Much Larger than Anticipated!

Heartland4 days ago

Anyone had issues ordering from the US to the uk

Heartland1 day ago

Can cbd help prevent hearing loss due to noise?

Heartland1 day ago

A good oil based sweetener?

Heartland1 day ago

Plant Power: Everyday Plants That Activate the Endocannabinoid System

Heartland4 days ago

Newbie questions regarding cbd & anxiety

Heartland4 days ago

1 dropper CBD VS 2 droppers CBD = dramatic contrast in effect

Heartland5 days ago

Quitting Nicotine

Heartland4 days ago

Anyone heard of or have tried this brand? Location near Dallas Texas

Heartland4 days ago

CBD oil causing issues with heart

Heartland5 days ago

How CBD changed a young boy’s life

Heartland5 days ago

Horizons ETFs to Launch World’s First Psychedelics-Focused ETF

Uncategorized5 days ago

USDA Final Rule on Hemp

Heartland18 hours ago

Build up of yellowy gold stuff inside vape tank. Is this the CBD content getting stuck? Can I extract it and dissolve it back into the E liquid?

Heartland5 days ago

Even Bernie is a fan of The Green Claw

Heartland4 days ago

What Is Kief And How To Use It | Honest Marijuana

Heartland4 days ago

CBG is so amazing for me! I guess it’s different for everyone but it has way more health benefits than CBD! I’ve been ordering by the case from centurioncbg, this is the best pain relief lotion I’ve ever had. Anyone try them yet? Or any CBG?

Heartland3 days ago

Can someone tell me what type of CBD liquid I’m supposed to put in a vape pen refillable cartridge?

Heartland5 days ago

Is this fine?

Heartland5 days ago

Mendo x Royal Kush

Heartland5 days ago

Mydecine Innovations Group Included in First-Ever Psychedelics ETF

Heartland3 days ago

pre-made tincture are more expensive?

Uncategorized2 days ago

Auxly Cannabis – The Clear Cut Way To Play Canadian Cannabis 2.0

Heartland1 day ago

The new Senate is the most cannabis-friendly in history. Tell your Senators to make this issue a priority!

Heartland3 days ago

What’s wrong with my CBD?

Heartland2 days ago

Transition from THC to CBD

Trending

A Cloud Nine Capital Entity Copyright © 2020 – All Rights Reserved Proudly Made in America