Effect of laser treatment parameters on surface modification and tribological behavior of AISI 8620 steel

Roy, Sougata; Zhao, Jingnan; Shrotriya, Pranav; Sundararajan, Sriram

doi:10.1016/j.triboint.2017.03.036

Cited by 34 publications

(15 citation statements)

References 36 publications

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“…Studies have shown that these parameters such as retained austenite [8], amount of residual stress [9], heat treatment techniques [10], and type of lubricants [11] influence the RCF life. In order to improve fatigue life, heat treatment is commonly used to induce residual stress and retained austenite in steels [12]. It is well-known that inducing compressive residual stress in steel provides positive effects on fatigue life [13].…”

Section: Background and Motivationmentioning

confidence: 99%

“…Table 2 to 93 degrees (2θ angle) was analyzed using TOPAS software to determine the amount of RA in those samples. TOPAS uses the Rietveld method which helps to fit theoretical data to a measured pattern using analytical profile functions & least square methods [12,[48][49][50]. The residual stress levels of the samples were measured using Cr XRD (wavelength 2.29 Å) with a target voltage of 35KV and current of 1.5 mA.…”

Section: Sample Preparation and Characterizationmentioning

confidence: 99%

“…Modern bearing steels and gears are clean and well lubricated and therefore subsurface cracks are more likely to be initiated due to the effect of the maximum normal stress or alternating shear stress under rolling contact below the surface[2,3].Over the decades, researchers and engineers have been working on improving the RCF life and reliability of the rolling element bearings and gears. Operations such as heat treatments are performed to improve the fatigue life by inducing residual stress and retained austenite in the materials[10,12,34,35]. It is well known that compressive residual stress improves fatigue life…”

mentioning

confidence: 99%

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Investigating the effect of retained austenite and residual stress on rolling contact fatigue of carburized steel with XFEM and experimental approaches

Ooi

Roy

Sundararajan

2018

Materials Science and Engineering: A

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In this study, the effects of retained austenite (RA) and residual stress on rolling contact fatigue (RCF) of carburized AISI 8620 steel were investigated through modeling and experiments. In modeling, a two-dimensional finite element RCF model was developed to examine the crack propagation and fatigue life of carburized AISI 8620 steel. An extended finite element method (XFEM) was used to initiate and propagate the cracks in the model. A Voronoi tessellation was randomly generated to simulate the randomness of the microstructures in steel. The cracks were initiated on the grain boundaries of a Voronoi cell prior to the simulations at different locations in the RCF model. The RCF life of the samples was determined by rolling contact fatigue tests. The results in both simulations and experiments showed that the higher level of RA and compressive residual stress achieved improved RCF life through mitigation of crack propagation. The effect of increased RA led to significant improvement on RCF life as compared to increased in compressive residual stress.

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Section: Background and Motivationmentioning

confidence: 99%

Section: Sample Preparation and Characterizationmentioning

confidence: 99%

mentioning

confidence: 99%

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Investigating the effect of retained austenite and residual stress on rolling contact fatigue of carburized steel with XFEM and experimental approaches

Ooi

Roy

Sundararajan

2018

Materials Science and Engineering: A

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“…Similar studies on cementation steels such as, the effect of heat treatment on abrasion behavior [4], the relationship between cementation depth and fatigue properties [7,8], the effect of martensite size on tension crack in a dual-phase microstructure [9], the relationship between residual austenite amount and crack propagation and fatigue behavior were investigated [10]. In addition, the relationship between the residual austenite content of the quenching medium and tribological properties of materials [11,12], the fatigue behavior of materials at different cementation temperatures and times [13], changes in mechanical properties [14] were studied. The relationship between ion nitriding behavior [15], hardness depth and abrasion behavior [16,17], microstructure and mechanical properties before and after heat treatment [18], the effect of process parameters on material removal rate and surface roughness [19] have been also studied in detail by various research groups.…”

Section: Introductionmentioning

confidence: 99%

SAE 8620 (21NiCrMo2) plakaların ısıl işleminde karbürizasyon süresi ve malzeme kalınlığına bağlı olarak oluşan sertlik değişimi

Karagöz

2019

El-Cezeri Fen Ve Mühendislik Dergisi

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In this study, SAE 8620 (21NiCrMo2) cementation steel was carburized in a salt bath containing 10% cyanide (Potassium Cyanide KCN). Samples with, two different sizes as 15x15x100 mm and 20x20x100 mm, were gradually heated from room temperature to the hardening temperature of 930 °C and kept at this temperature for two different holding times as six and seven hours. The temperature was gradually reduced to 860 °C and the samples were held there for 40 minutes and then quenched in the oil cooling medium. After quenching, the materials were tempered at 180 °C for two hours. The surfaces of the samples which were sanded according to microstructure examinations and polished with diamond paste were etched with 5% Nital solution. Surface hardness and microhardness of the samples were measured and then their microstructures were examined with an optical microscope. The hardness depth and effective hardness depth were 1.6 mm and 1.2 mm, respectively. It was observed that hardening up to a 0.2 mm depth was at maximum level and hardness values decreased while approaching the core. The microstructure examinations displayed that the martensitic layer was formed on the surface and this layer lost its effect as it penetrated inwards. In the cementation process, it was determined that material thickness and carburization time had an effect on material properties.

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“…The higher hardness at the surface layer imparts excellent wear resistance, while the soft inner core provides higher toughness and fracture resistance. Hardness, strength and wear resistance can be improved using different surface treatments, such as induction, flame hardening, electron beam and more recent technologies such as laser and electrolytic plasma hardening [1][2][3][4][5][6]. However, electrolytic plasma hardening stands out for several good reasons.…”

Section: Introductionmentioning

confidence: 99%

Wear performance of ductile iron after electrolytic plasma hardening

Ayday¹,

Durman²

2020

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This study aimed to improve the tribological behavior of electrolytic plasma treated (EPT) ductile iron (DI). For this purpose, ductile iron was electrolytic plasma hardened under different processing parameters (treatment time and thermal cycle). Three different types of specimens were tested: untreated DI, electrolytic plasma hardened DI and remelted DI by two type wear test. It was found that remelted DI performed much better concerning wear resistance than the other samples. The microstructure of the hardened specimens was investigated using optical microscopy. Microhardness profiles and surface hardness were investigated via the Rockwell test. The microstructure and hardness of the EPT hardened layer were dependent on the processing parameters, with the hardness values reaching the range 880-1080 ± 10 HV0.2. K e y w o r d s : electrolytic plasma hardening, ductile iron, hardness, remelting, wear

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Effect of laser treatment parameters on surface modification and tribological behavior of AISI 8620 steel

Cited by 34 publications

References 36 publications

Investigating the effect of retained austenite and residual stress on rolling contact fatigue of carburized steel with XFEM and experimental approaches

Investigating the effect of retained austenite and residual stress on rolling contact fatigue of carburized steel with XFEM and experimental approaches

SAE 8620 (21NiCrMo2) plakaların ısıl işleminde karbürizasyon süresi ve malzeme kalınlığına bağlı olarak oluşan sertlik değişimi

Wear performance of ductile iron after electrolytic plasma hardening

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