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

Kumar, Rajesh; Dwivedi, Rinky; Ahmed, Siraj

doi:10.1007/s12633-020-00513-2

Cited by 19 publications

(8 citation statements)

References 32 publications

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“…The standard database (JCPDS database) for XRD pattern was used to recognize the crystalline phases. Microstructure was examined using Carl-Zeiss Axio Scope 5 Optical Microscope and Carl Zeiss make Ultra Plus FESEM to know particle distribution, grain boundaries and interfacial bonding [24][25][26][27]. Samples of 20mm diameter and 15mm thick were cut, cold mounted and polished as per standard metallographic technique and etched by Keller's reagent (3 ml HCl, 2 ml HF, 5 ml HNO 3 , 190 ml H 2 O).…”

Section: Microstructural Analysismentioning

confidence: 99%

Influence of Microstructure on Tribological Behaviors of Al6061 Metal Matrix Composite Reinforced with Silicon Nitride (Si3N4) and Silicon Carbide (SiC) Micro Particles

Arya¹,

Kumar²,

Telang

2023

Silicon

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Dual step stir casting method was utilized to develop Al6061 composite reinforced with SiC (micron) and Si 3 N 4 (submicron) particles in varying proportion and weight percentage. A homogeneous and uniform distribution of hybrid reinforcement without signi cant porosity was observed in the microstructure of the composites. X-ray diffraction (XRD) results manifest that Si 3 N 4 and SiC particles are thermodynamically stable during the processing and no unwanted phases were detected. Elemental mapping was also performed for phase identi cation. With reference to the base alloy signi cant improvement was noticed in physical and tribological properties of hybrid composites. Maximum rise in hardness was 54.64%. Abrasive wear test results from pin on disc reveals that wear resistance get enhanced for all composition and load is found to be most dominating factor affecting wear behavior.

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Section: Microstructural Analysismentioning

confidence: 99%

Influence of Microstructure on Tribological Behaviors of Al6061 Metal Matrix Composite Reinforced with Silicon Nitride (Si3N4) and Silicon Carbide (SiC) Micro Particles

Arya¹,

Kumar²,

Telang

2023

Silicon

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“…These regions are down up to few nanometres in thickness. The fewer nucleation sites for the martensite transformation and the high carbon supersaturation makes them more stable for the transformation to occur, thus mechanically they are more stable [21][22][23][24][25][26]37]. In the figure 2 author Rajan Kumar showed the microstructure of the worn-out surface after rolling/sliding wear tests performed over specimens for different temperatures like for a part 300°C while b and c were at 350C and 400 C respectively with 20s holding time.…”

Section: Ra Typesmentioning

confidence: 99%

Influence of austempering temperature on carbide free bainite development, a critical review

Kumar¹,

Tripathi²,

Dwivedi

et al. 2023

J. Phys.: Conf. Ser.

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In this review paper, it is well established that high carbon high silicon steels on austempering result in carbide free bainite (CFB) which exhibits enhanced mechanical and tribological properties without adding any heavy alloying elements. Most of the research has been pointed out regarding the improvement of CFB steels that consists of the fine structure of bainitic ferrite laths and retained austenite (RA). In some cases, it was observed that the tensile strength of CFB steels was found similar to the commercial quenched and tempered steel alloys. Regarding other properties, it is estimated that out of the various failures that take place due to wear, 50% are caused by abrasive wear. To improve the lifetime of components, the selection of material and optimized processing techniques plays a pivotal role.

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“…Son et al [ 19 ] observed on a 0.9C-2.3Si steel an increase in both ferritic and austenitic grain size, and RA final amount. Kumar et al [ 20 ] demonstrated that the bainite volume fraction increases with a decreasing austempering temperature, and that RA decreases with holding time. The reduction in the final volume fraction of the retained austenite’s increasing isothermal bainitic transformation (IBT) time was also observed by Acharya et al [ 21 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Different Austempering Heat Treatments on Corrosion Properties of High Silicon Steel

et al. 2021

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A novel high silicon austempered (AHS) steel has been studied in this work. The effect of different austenitizing temperatures, in full austenitic and biphasic regime, on the final microstructure was investigated. Specimens were austenitized at 780 °C, 830 °C, 850 °C and 900 °C for 30 min and held isothermally at 350 °C for 30 min. A second heat treatment route was performed which consisted of austenitizing at 900 °C for 30 min and austempering at 300 °C, 350 °C and 400 °C for 30 min. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) have been used to evaluate the microstructural evolution. These techniques revealed that the microstructures were composed of carbide-free bainite, ferrite, martensite and retained austenite (RA) in different volume fractions (Vγ). An aqueous borate buffer solution with 0.3 M H3BO3 and 0.075 M Na2B4O7∂10H2O (pH = 8.4) was used for corrosion tests in order to evaluate the influence of the different volume fractions of retained austenite on the corrosion properties of the specimens. The results showed that when increasing the austenitization temperatures, the volume fractions of retained austenite reached a maximum value at 850 °C, and decrease at higher temperatures. The corrosion properties were investigated after 30 min and 24 h immersion by means of potentiodynamic polarization (after 30 min) and electrochemical impedance spectroscopy (after both 30 min and 24 h) tests. The corrosion resistance of the samples increased with increases in the volume fraction of retained austenite due to lower amounts of residual stresses.

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

Cited by 19 publications

References 32 publications

Influence of Microstructure on Tribological Behaviors of Al6061 Metal Matrix Composite Reinforced with Silicon Nitride (Si3N4) and Silicon Carbide (SiC) Micro Particles

Influence of Microstructure on Tribological Behaviors of Al6061 Metal Matrix Composite Reinforced with Silicon Nitride (Si3N4) and Silicon Carbide (SiC) Micro Particles

Influence of austempering temperature on carbide free bainite development, a critical review

Effect of Different Austempering Heat Treatments on Corrosion Properties of High Silicon Steel

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