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Effect of Composition and Processing Parameters on the Formation of Nano-Bainite in Advanced High Strength Steels

Journal of Iron and Steel Research International 2011年第S1期18卷 238-241页

作者： Ilana Timokhina hossein beladi Peter Hodgson Centre for Material and Fibre Innovation Deakin UniversityGeelongVIC 3217

The nano-bainitic microstructures were compared in a 0.79C-1.5Si-1.98Mn-0.24Mo-1.06Al (wt%) steel after isothermal heat-treatment and a Fe-0.2C-1.5Mn-1.2Si-0.3Mo-0.6Al-0.02Nb (wt%) steel after controlled thermomechanical *** microstructure for both steels consisted of *** microstructural characteristics of bainite,such as the morphology of the nano-bainite and thicknesses of bainitic ferrite and retained austenite layers,as a function of steel composition and processing was studied using transmission electron microscopy (TEM).It was found that the nano-bainitic structure can be formed in the low alloy steel through thermomechanical *** probe tomography (APT) was employed as a powerful technique to determine local composition distributions in three dimensions with atomic *** important conclusions from the APT research were that the carbon content of bainitic ferrite is higher than expected from paraequilibrium level of carbon in ferrite for both steels and that Fe-C clusters and fine particles are formed in the bainitic ferrite in both steels despite the high level of Si.

关键词： nano-bainite transmission electron microscopy atom probe tomography carbon content

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The Evolution of Ultrafine Grained Structure Formation Through Isothermal Static Phase Transformation

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Journal of Iron and Steel Research International 2011年第S1期18卷 218-222页

作者： hossein beladi ILANA B Timokhina SUBRATA Mukherjee PETER D Hodgson Centre for Material and Fibre Innovation Deakin UniversityGeelongAustraliaVic 3216

In the current study,a 0.3C-2Si-2Mn-0.28Mo (in wt%) steel with high hardenability was deformed at a relatively low temperature followed by isothermal static phase *** novel thermomechanical processing made it possible to successfully produce an ultrafine ferrite grained structure (～2 μm) in the absence of both dynamic phase transformation and controlled *** use of a model Ni-30Fe austenitic alloy showed that the low temperature deformation induced very fine intragranular defects throughout the microstructure,which would then act as fine spaced ferrite nucleation sites at an early stage of phase *** a result,the coarsening of ferrite was extremely limited during isothermal phase transformation,resulting a very fine ferrite grained structure;even nanoscale in the region of the prior austenite grain boundary.

关键词： ultrafine ferrite warm deformation isothermal phase transformation substructure

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Study the Effect of High Dialysate Potassium Solution in Comparison to Low Potassium Dialysate Solution in End Stage Renal Disease Patients

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Health 2016年第4期8卷 363-369页

作者： Mohammad Nourizadeh Masih Shakeri Seyed Seifolah beladi Mousavi Mohammad Hassan Adel Mohammad hossein Najafi Zahra Rezaee Mehdi Nourizadeh Sara Nourizadeh Atherosclerosis Research Centre Ahvaz Jundishapur University of Medical Sciences Ahvaz Iran Department of Cell & Molecular Biology Faculty of Biological Sciences Kharazmi University Tehran Iran

Background: Nowadays cardiovascular diseases remain as the single most common cause of death in chronic dialysis patients;the aim of this study was to evaluate the effects of two different regimens of dialysis potassium removal in patients with a tendency to develop arrhythmias during haemodialysis (HD). Methods and Materials: There were 88 (36 men and 52 women) end stage renal disease (ESRD) patients recruited for the study. They received regular haemodialysis three times per week at the haemodialysis units of a university medical centre (Golestan hospital) during year 2011. We compared the arrhythmogenic effects of two dialysis techniques. Results: There was a tendency in the HD solution with constant (3 mEq/l) K for premature ventricular complex (PVC) appearance in to be reduced as compared with constant (2 mEq/l) K in the time of dialysis period, although this reduction was not statistically significant(P = 0.09). There was a significant reduction in SVC in the HD solution with constant (3 mEq/l) K as compared with constant (2 mEq/l) K. Discussion: In conclusion, the use of a model of intra-HD potassium that is more close to potassium serum concentration of ESRD patients can reduce the arrhythmogenic effect of HD in patients on regular HD treatment.

关键词： Arrhythmia Dialysis End Stage Renal Disease

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