Stability of Retained Austenite in Carbide Free Bainite during the Austempering Temperature and its Influence on Sliding Wear of High Silicon Steel

Silicon ◽  
2020 ◽  
Author(s):  
Rajan Kumar ◽  
Ravi Kumar Dwivedi ◽  
Siraj Ahmed
Keyword(s):  
Retained Austenite ◽  
Sliding Wear ◽  
Silicon Steel ◽  
High Silicon Steel ◽  
High Silicon ◽  
Austempering Temperature

Retained austenite stabilisation in low carbon high silicon steel during isothermal holding

2018 ◽  
Vol 35 (1) ◽  
pp. 45-54
Author(s):  
Z. J. Xie ◽  
Z. F. Liu ◽  
R. D. K. Misra ◽  
C. J. Shang ◽  
G. Han ◽  
...  
Keyword(s):  
Retained Austenite ◽  
Isothermal Holding ◽  
Silicon Steel ◽  
Low Carbon ◽  
High Silicon Steel ◽  
High Silicon

Effect of Vanadium on Microstructure and Mechanical Properties of Air Cooled Medium Carbon High Silicon Bainite Steels

2011 ◽  
Vol 311-313 ◽  
pp. 931-935
Author(s):  
Jun Miao ◽  
Li Jun Wang ◽  
Chun Ming Liu
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Retained Austenite ◽  
Silicon Steel ◽  
Alloyed Steel ◽  
Air Cooling ◽  
Medium Carbon ◽  
Transmission Electron ◽  
High Silicon Steel ◽  
High Silicon

The effect of vanadium on the bainite transformation of medium carbon high silicon steel during air cooling was studied by using Optical Microscopy (OM) and Transmission Electron Microscopy (TEM). The mechanical properties of the test steels subjected to heat treatment were measured by tensile, hardness and impact tests. The results showed that, through the same heat treatment process, the microstructure of the V-alloyed steel was comprised of Carbide-Free Bainite (CFB, bainite + retained austenite) and martensite while the microstructure of the V-free steel was composed of ferrite/pearlite, which made the V-alloyed steels exhibit superior combination of strength, hardness and toughness to the V-free steel, but the elongation of the V-alloyed steel was worse than that of the V-free steel somewhat. Vanadium was helpful for the transformation of bainite in the tested medium carbon high silicon steel under air cooling condition. The carbon-enriched retained austenite films in the CFB enhanced the toughness of the V-alloyed steel.

Characterization of the Carbon and Retained Austenite Distributions in Martensitic Medium Carbon, High Silicon Steel

2007 ◽  
Vol 38 (8) ◽  
pp. 1698-1711 ◽  
Author(s):  
Donald H. Sherman ◽  
Steven M. Cross ◽  
Sangho Kim ◽  
Fernande Grandjean ◽  
Gary J. Long ◽  
...  
Keyword(s):  
Retained Austenite ◽  
Silicon Steel ◽  
Medium Carbon ◽  
High Silicon Steel ◽  
High Silicon

scholarly journals Microstructure and wear behavior of austempered high carbon high silicon steel

2018 ◽  
Vol 144 ◽  
pp. 02013 ◽  
Author(s):  
Palaksha Acharya ◽  
Ajit Kumar ◽  
Ravishankar Bhat
Keyword(s):  
Wear Rate ◽  
Wear Behavior ◽  
Bainitic Ferrite ◽  
Silicon Steel ◽  
Specific Wear Rate ◽  
Dry Sliding Wear ◽  
Wear Property ◽  
High Silicon Steel ◽  
High Silicon ◽  
Austempering Temperature

In the present investigation, the influence of austempering temperature and time on the microstructure and dry sliding wear behavior of high silicon steel was studied. The test specimens were initially austenitised at 900°C for 30 minutes, thereafter austempered at various temperatures 280°C, 360°C and 400°C, for varying duration from 30 to 120 minutes. These samples after austempering heat treatment were subsequently air cooled to room temperature, to generate typical ausferritic microstructures and then correlated with the wear property. The test outcomes demonstrate the slight increase in specific wear rate with increase in both austempering temperature and time. Specific wear rate was found to be minimum at an austempering temperature of 280°C, that exhibits lower bainite microstructure with high hardness, on the other hand specific wear rate was found to be slightly high at increased austempering temperatures at 360°C and 400°C, due to the upper bainite structure that offered lower hardness to the matrix. The sample austempered at 280°C for 30 minutes offered superior wear resistance when compared to other austempering conditions, mainly due to the presence of fine acicular bainitic ferrite along with stabilized retained austenite and also some martensite in the microstructure.

Atomic scale observations of bainite transformation in a high carbon high silicon steel

2007 ◽  
Vol 55 (1) ◽  
pp. 381-390 ◽  
Author(s):  
F CABALLERO ◽  
M MILLER ◽  
S BABU ◽  
C GARCIAMATEO
Keyword(s):  
Silicon Steel ◽  
Atomic Scale ◽  
High Carbon ◽  
Bainite Transformation ◽  
High Silicon Steel ◽  
High Silicon

Crack Formation Mechanism of High Silicon Steel during Twin-Roll Strip Casting

2017 ◽  
Vol 898 ◽  
pp. 1276-1282
Author(s):  
Wen Li Hu ◽  
Yuan Xiang Zhang ◽  
Guo Yuan ◽  
Guo Dong Wang
Keyword(s):  
Formation Mechanism ◽  
Crack Formation ◽  
Silicon Steel ◽  
Strip Casting ◽  
Dominant Factor ◽  
Transverse Cracks ◽  
High Silicon Steel ◽  
High Silicon ◽  
Gas Gap ◽  
Twin Roll

High silicon steel was fabricated by twin-roll strip casting. The cracks on the surfaces of the processed strips were obtained and analyzed by digital camera after series of surface treatment. Optical microscopy (OM) and scanning electron microscopy (SEM) were used to observe and characterize the microstructure nearby crack and fracture surface along the normal direction, respectively, and the crack formation mechanism was further analyzed in conjunction with processing parameters utilized during twin-roll strip casting process. The results indicated that morelongitudinal cracks along the rolling direction were observed in comparison with transverse cracks along the transverse direction on the strip surfaces. Trans granular and intergranular fracture modes both worked during the formations of longitudinal and transverse cracks on the processed strips. The dominant factor causing the formation of crack on the surface of the processed strips was the inhomogeneous transfer of heat during casting and rolling. The inhomogeneous transfer of heat induced by gas gap during casting resulted in variations of dendrite length and secondary dendrite spacing (SDAS). Meanwhile, the casting velocity influenced the formation of gas gap, which further influenced the thermal contraction. So the control of velocity of casting above a certain level proved beneficial to enhancing the performance of strip casting and to improving the quality of strip products.

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