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Nanostructured Carbide-Free Bainite Formation in Low Carbon Steel

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Acta Metallurgica Sinica(English Letters) 2020年第12期33卷 1635-1644页

作者： Hamid Mousalou Sasan Yazdani naghi parvini ahmadi Behzad Avishan Faculty of Materials Engineering Sahand University of TechnologyP.O.Box:51335/1996TabrizIran Department of Materials Engineering Azarbayan Shahid Madani UniversityTabrizIran

It is an important challenge to reduce the carbon content in nanostructured bainitic steels for commercialization purposes while still being able to gain the desired microstructural characteristics in nanoscale and not to deteriorate the strength–ductility *** is the point at which an appropriate heat treatment procedure design would be an important *** article aims to investigate how to obtain nanostructured bainite in steel with 0.26 wt%carbon content by applying multi-step austempering ***-,two-and three-step austempering processes have been implemented,and proper heat treatment temperatures and approaches were selected based on dilatometry *** indicated that it has become possible to achieve bainitic ferrites and austenite fi lms with overall thicknesses of 164,145 and 132 nm and 134,105 and 90 nm at the end of one-,two-and three-step austempering heat treatments,***,microstructural characteristics resulted in enhanced mechanical properties with ultimate tensile strength(UTS)of 1435,1455 and 1428 MPa in combination with elongation levels of 15.4,13.6 and 11.4%after implementing those heat ***,it has been shown that applying the multi-step austempering heat treatments resulted in enhanced yield strength and impact toughness values due to the microstructural characteristics and proper heat treatment procedure design.

关键词： Bainite Multi-step austempering Austenite Mechanical properties Impact toughness

Enhanced selectivity of hydrolytic precipitation of Zn from Zn-Ni sulfate solution via chelation of Ni

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Transactions of Nonferrous Metals Society of China 2018年第12期28卷 2566-2573页

作者： Mostafa Aghazadeh-Ghomi Javad Moghaddam naghi parvini ahmadi Department of Materials Engineering Azarbaijan Shahid Madani University Materials and Metallurgical Engineering department University of Zanjan Faculty of Materials Engineering Sahand University of Technology

The selective precipitation of zinc from zinc-nickel sulfate solution with the Zn/Ni molar ratio of20:1was *** addition of0.5mol/L NaOH solution into the zinc-nickel sulfate solution containing0,0.01,0.02,0.03and0.04mol/L ethylene diamine tetraacetate(EDTA)as a chelating agent was *** equilibrium analysis of precipitation pathway was performed using Visual MINTEQ *** equilibrium analysis showed that the presence of small amounts of EDTA can prevent nickel precipitation in alkaline conditions without any negative effect on zinc *** this basis,more than90%of zinc could be precipitated as a product with about50%Zn and only0.11%Ni at pH=9.0merely as a result of the presence of0.03mol/L EDTA in the *** stirring time of120min after precipitation was found to be essential for more complete *** X-ray diffraction studies on the precipitate revealed that the precipitated phase was Zn4(OH)6SO4.4H2O.

关键词： zinc nickel hydrolytic precipitation separation chelate equilibrium analysis

Electrodeposition and corrosion behavior of Zn-Ni-Mn alloy coatings deposited from alkaline solution

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Transactions of Nonferrous Metals Society of China 2020年第2期30卷 548-558页

作者： Babak ABEDINI naghi parvini ahmadi Sasan YAZDANI Luca MAGAGNIN Faculty of Materials Engineering Sahand University of TechnologyTabrizIran Dipartimento di Chimica Materiali e Ingegneria Chimica Giulio NattaPolitecnico di MilanoVia Mancinelli 720131MilanoItaly

The potentiostatic electrodeposition of Zn-Ni-Mn was carried out in an alkaline solution with the addition of Mn *** effects of electrolyte Mn2+concentration and deposition potential on the surface morphology,phase structure and corrosion behavior of coatings were *** results of corrosion polarization showed that the presence of higher Mn content in Zn-Ni-Mn coatings could lead to the formation of a good passive layer with a 7-fold increase in Rp of coating and a significant decrease in the corrosion current density compared to those of Zn-Ni *** XRD and the XPS analyses from the surface of Zn-Ni-Mn after corrosion test showed that the passive layer was composed of zinc hydroxide chloride,zinc oxide,zinc hydroxide carbonate,and manganese oxides.

关键词： Zn-Ni-Mn electrodeposition alkaline bath phase structure corrosion resistance chemical composition