scholarly journals Influence of Austempering of As-Cast Medium Carbon High-Silicon Steel on Wear Resistance

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7518
Author(s):  
Marko Sedlaček ◽  
Grega Klančnik ◽  
Aleš Nagode ◽  
Jaka Burja
Keyword(s):  
Wear Resistance ◽  
Low Temperature ◽  
Impact Toughness ◽  
Isothermal Holding ◽  
Rock Breaking ◽  
Silicon Steel ◽  
Tempered Martensite ◽  
Medium Carbon ◽  
High Silicon Steel ◽  
High Silicon

The aim of this study was to evaluate the effect of austempering compared to quenching and low-temperature tempering on wear resistance of an as-cast medium carbon high-silicon steel intended for rock breaking. Austempering was done by isothermal holding at 270, 300 and 350 °C in molten salt baths, while quenching was done in water. The austempering treatments resulted in microstructural combinations of bainite and martensite. The isothermal holding at 270 °C resulted in bainite and self-tempered martensite, while isothermal holdings at 300 and 350 °C resulted in bainite and untempered martensite. The two quench and temper treatments resulted in tempered martensite. In general austempering resulted in lower hardness values when compared to quenching and tempering but higher impact toughness. The wear resistance was best for quenching and low temperature tempering, followed by austempering at 270 °C, but at slightly lower hardness and 25% higher impact toughness. The other two austempering treatments resulted in worse wear resistance.

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

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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