eng
Iron & Steel Society of Iran
International Journal of Iron & Steel Society of Iran
2981-0388
2981-0396
2015-12-01
12
2
1
6
18516
مقاله پژوهشی
The Effect of Cold Rolling Process on the Microstructure and Texture Evolution in a 1 wt. % Si Non-oriented Electrical Steel
The Effect of Cold Rolling Process on the Microstructure and Texture
Evolution in a 1 wt. % Si Non-oriented Electrical Steel
A Sonboli
a.sonboli@ma.iut.ac.ir
1
M. R. Toroghinejad
2
H. Edris
h-edris@cc.iut.ac.ir
3
J. A. Szpunar
4
Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156- 83111, Iran
Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156- 83111, Iran
Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156- 83111, Iran
Department of Mechanical Engineering, University of Saskatchewan, Saskatoon, SK, Canada S7N 5A9
In this study, the effect of cold rolling process on the microstructure and texture evolution in 1wt. % Si non-oriented electrical steel was investigated. For this purpose, all samples were processed through single-stage hot rolling at 1100 ° C and two-stage cold rolling (cross rolling and unidirectional rolling) with intermediate annealing at 650 °C for 35 seconds. Finally, all of them were fully annealed for 3 min at 900 ° C. The results showed that cold rolling process could affect shear band formation, deformation texture and annealing texture. Shear band and {322} grains were decreased and {100} grains were increased by the cross rolling method. These observations showed the weakening of the {110} and {111} components and the strengthening of the {001} component after final annealing for the cross rolled sample. On the other hand, shear band formation in the unidirectional rolling sample caused the development of annealing Goss texture component ({110} ).
https://journal.issiran.com/article_18516_1af801841d272c7a381784c3e4dcf8cb.pdf
Non-oriented electrical steel
Microstructure
Texture
Shear band
eng
Iron & Steel Society of Iran
International Journal of Iron & Steel Society of Iran
2981-0388
2981-0396
2015-12-01
12
2
7
16
18517
مقاله پژوهشی
Growth Defects and Chromium Content Loss during the Deposition of Stainless Steel by CAE-PVD and Its Effect on the Corrosion and Passivation Behavior of the Coating
Growth Defects and Chromium Content Loss during the Deposition of
Stainless Steel by CAE-PVD and Its Effect on the Corrosion and Passivation
Behavior of the Coating
A. Sanati
alisanati92@gmail.com
1
K. Raeissi
2
H. Edris
h-edris@cc.iut.ac.ir
3
Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156- 83111, Iran.
Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156- 83111, Iran.
Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156- 83111, Iran
In the present study, the effects of growth defects and chromium content loss on the degradation of corrosion and passivation of cathodic arc evaporation (CAE-PVD) of stainless steel coating were investigated in 2 M sulphuric acid solution. EDS analysis indicated that the micro-particles were obtained during the coating growth. In addition, it was detected that the growth defects had poor adhesion to the coating matrix and in the open circuit potential (OCP), they were detached from the coating, providing appropriate conditions for the penetration of the solution. In addition, loss of chromium during evaporation was found to be detrimental to the passivation of the stainless steel coating and the formation of a porous oxide layer. The average percent of the main elements of the coating, according to EDS area analysis, was Fe-13Cr-6Ni. Moreover, the lower semicircle diameter of the coating in electrochemical impedance spectroscopy (EIS) measurements revealed the lower polarization resistance of it, in comparison to that of the bulk 304 stainless steel.
https://journal.issiran.com/article_18517_69bc9c685ed74e313da742c545d941f6.pdf
Stainless steel coating
CAE-PVD
Growth defects
Corrosion
Passivation
eng
Iron & Steel Society of Iran
International Journal of Iron & Steel Society of Iran
2981-0388
2981-0396
2015-12-01
12
2
17
23
18519
مقاله پژوهشی
Investigation of Wear Mechanism in Quenched and Tempered Medium Carbon-High Chromium Martensitic Steel Using Dry Sand/Rubber Wheel
Investigation of Wear Mechanism in Quenched and Tempered Medium
Carbon-High Chromium Martensitic Steel Using Dry Sand/Rubber Wheel
S.M. Sehri
1
H. Ghayour
ghayour_ham@iust.ac.ir
2
K. Amini
k.amini@srbiau.ac.ir
3
H. Rastegari
4
Advanced Materials Research Center, Department of Materials Engineering, Najafabad Branch, Islamic Azad University , Najafabad, Isfahan , Iran
Advanced Materials Research Center, Department of Materials Engineering, Najafabad Branch, Islamic Azad University , Najafabad, Isfahan , Iran
Department of Mechanical Engineering, Tiran Branch, Islamic Azad University, Tiran, Isfahan, Iran
Department of Mechanical and Materials Engineering, Birjand University of Technology, South Khorasan, Iran
The aim of the present study was to investigate the effect of quenching and tempering temperatures on the microstructure, mechanical properties and the wear characteristics of medium carbon-high chromium wear resistant steel. In addition, the dominant wear mechanisms were studied. For this purpose, austenitizing and tempering temperatures were selected in the ranges of 900- 1000 °C and 300- 500 °C, respectively. Mechanical properties were evaluated through hardness and impact tests as well as wear test (by dry sand/rubber wheel apparatus). Microstructure and wear and fracture surface appearances were investigated using scanning electron microscopy (SEM). Moreover, the measurement of retained austenite was done through X-Ray diffraction (XRD) analysis. The obtained results revealed that the best wear properties were achieved by tempering at 450 °C due to the reduction of tendency to micro-cracking, the decrease in internal stresses, and the improvement of the impact energy. Observing the wear surfaces showed that the wear mechanism for the specimen tempered at 400 °C was a combination of abrasive, adhesive and fatigue wear. However, abrasive wear was the only active wear mechanism for the specimen tempered at 450 °C.
https://journal.issiran.com/article_18519_54848204ec1f77478319c56588bdae27.pdf
Medium carbon-high chromium wear resistant steel
Tempering
Dry sand/rubber-wheel abrasion
Wear mechanism
eng
Iron & Steel Society of Iran
International Journal of Iron & Steel Society of Iran
2981-0388
2981-0396
2015-12-01
12
2
24
29
18526
مقاله پژوهشی
Investigating the Effect of the Deep Cryogenic Heat Treatment on the Mechanical Properties and Corrosion Behavior of 1.2080 Tool Steel
Investigating the Effect of the Deep Cryogenic Heat Treatment on the
Mechanical Properties and Corrosion Behavior of 1.2080 Tool Steel
K. Amini
kamran_amini1978@hotmail.com
1
A. Akhbarizadeh
2
S. Javadpour
3
Department of Mechanical Engineering, Tiran Branch, Islamic Azad University, Isfahan, Iran
Department of Materials Science and Engineering, Shiraz Branch, Islamic Azad University, Shiraz, Iran.
Department of Materials Science and Engineering, Shiraz University, Shiraz, Iran
Deep cryogenic heat treatment is assumed as a supplementary heat treatment performed on steels before the final tempering treatment to enhance the wear resistance and hardness of the steels. In this study, the effects of the deep cryogenic heat treatment on the wear behavior and corrosion resistance of the 1.2080 tool steel were studied using the wear testing machine and polarization and impedance spectroscopy tests. Moreover, the microstructural changes of the deep cryogenically treated samples were clarified via the scanning electron microscope (SEM) and X-ray diffraction testing machine. The results showed that the deep cryogenic heat treatment eliminated the retained austenite and made a more uniform carbide distribution with higher percentages. Beyond this, it was clarified that the deep cryogenic heat treatment increased the hardness and improved the wear behavior of the 1.2080 tool steel, as well as decreasing the corrosion resistance, due to the higher chromium carbides produced during the deep cryogenic heat treatment.
https://journal.issiran.com/article_18526_40405ef35d963ca17d3fa6d1d7c668dc.pdf
Deep cryogenic heat treatment
wear behavior
Corrosion resistance
Microstructural changes
eng
Iron & Steel Society of Iran
International Journal of Iron & Steel Society of Iran
2981-0388
2981-0396
2015-12-01
12
2
30
38
18527
مقاله پژوهشی
A Corrosion Study of Grain-Refined 304L Stainless Steels Produced by the Martensitic Process
A Corrosion Study of Grain-Refined 304L Stainless Steels Produced by the
Martensitic Process
M. Atapour
m.atapour@cc.iut.ac.ir
1
M. M Dana
2
F. Ashrafizadeh
3
Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156- 83111, Iran
Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156- 83111, Iran
Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156- 83111, Iran
AISI 304L austenitic stainless steel with different grain sizes of 0.5 -12 μm was obtained through the martensitic process. Corrosion behavior of different samples was investigated in a 0.5M HCl solution using open circuit potential, potentiodynamic polarization and electrochemical impedance spectroscopy tests. Also, the correlation between the grain size and pitting corrosion resistance was assessed by cyclic polarization experiments and immersion tests combined with optical microscopy. The potentiodynamic polarization results demonstrated that grain refinement had little influence on the corrosion potential and corrosion current density. However, cyclic polarization tests showed that the ultrafine grained steel (500 nm grain size) exhibited superior pitting resistance, as compared to the steel with the larger grain size (1- 12 μm). This behavior was confirmed by immersion tests in the 0.5M HCl for 48 hours, thereby showing that the size and the number of pits were decreased by increasing the grain size. The electrochemical impedance spectroscopy results also revealed that grain refinement enhanced the stability of the passive film of 304L stainless steel.
https://journal.issiran.com/article_18527_1913f1102427659e4e5e3532f999f95a.pdf
Ultra-fine grained stainless steel
Corrosion, Pitting corrosion resistance
Grain size
eng
Iron & Steel Society of Iran
International Journal of Iron & Steel Society of Iran
2981-0388
2981-0396
2015-12-01
12
2
39
45
18528
مقاله پژوهشی
The Impact of MnO, Li2O, ZnO and TiO2 on Mold Powders Viscosity Using Hot Stage Microscope Analysis
The Impact of MnO, Li2O, ZnO and TiO2 on Mold Powders Viscosity Using
Hot Stage Microscope Analysis
A. R. Arefpour
arefpour.a@gmail.com
1
A. Shafierad
2
A. Monshi
a-monshi@cc.iut.ac.ir
3
A. Saidi
4
M. Monshi
5
Advanced Materials Research Center, Faculty of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Isfahan, Iran
Advanced Materials Research Center, Faculty of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Isfahan, Iran
Advanced Materials Research Center, Faculty of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Isfahan, Iran
Advanced Materials Research Center, Faculty of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Isfahan, Iran
Advanced Materials Research Center, Faculty of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Isfahan, Iran
The aim of conducting this research was to evaluate the viscosity change in the continuous casting of steel mold powders by altering their chemical compositions, using hot stage microscope analysis. 4 low-fluorine samples containing such compositions as MnO, Fe2O3, Li2O, TiO2 and ZnO, as well as another fluorine-free sample containing a combination of Fe2O3 and TiO2, were prepared in this research. The viscosity of the reference powder (the mold powder applied in high-speed continuous casting in steel industry), as well as the viscosity of the above-mentioned samples, was evaluated using hot stage microscope analysis. The results of hot stage microscope analysis revealed that the viscosity of the reference powder was similar to that of low-fluorine and fluorine-free samples. Finally, a fluorine-free sample containing a combination of Fe2O3 and TiO2 was introduced as an optimized composition which could be a substitute for the currently-used mold powder applied in the continuous casting of steel with high speed, considering its similar viscosity to be that of the reference powder.
https://journal.issiran.com/article_18528_47754f3fd888aff85674c3bf636e4dc4.pdf
Mold powder
Viscosity
Hot Stage Microscope
eng
Iron & Steel Society of Iran
International Journal of Iron & Steel Society of Iran
2981-0388
2981-0396
2015-12-01
12
2
46
49
18530
مقاله پژوهشی
Observation of Stacking Fault Tetrahedral in TWIP Steel
Observation of Stacking Fault Tetrahedral in TWIP Steel
G. Dini
g.dini@sci.ui.ac.ir
1
S. Vercammen
2
Department of Nanotechnology Engineering, Faculty of Advanced Sciences and Technologies, University of Isfahan, Isfahan 81746- 73441, Iran
K. U. Leuven, Department of Metallurgy and Materials Engineering, Kasteelpark Arenberg 44, B-3001 Leuven, Belgium
Low stacking fault energy face centered cubic (FCC) materials contain characteristic defect structures. Stacking fault tetrahedral are one of those rare structures that occur under special experimental conditions. For the first time, stacking fault tetrahedral were observed in Fe-30Mn-3Al-3Si twinning induced plasticity (TWIP) steel. Their presence resulted from a quenching heat treatment.
https://journal.issiran.com/article_18530_c349a431b7eb4ef9cf1de91f2b51a4ec.pdf
TWIP steel
Stacking fault tetrahedral
Quenching
Low SFE