Sliding wear behaviour and its mechanisms of carbonitrided AISI 8620 steel at 100°C under unlubricated conditions

Sankaran, Rohith; Rajamani, D.; Natarajan, S.; Thirugnanasambantham, K. G.

doi:10.1179/1743294415y.0000000090

Cited by 7 publications

(5 citation statements)

References 25 publications

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“…SEM surveys of wear tracks formed at high testing load of 4 N, revealed that the unalloyed PTA specimen has undergone severe damage wherein carbides are not only cracked but also removed during the progress of wear. Besides there is evidence for severe ploughing and stair casing (as a result of fatigue wear) as observed in earlier studies [36][37][38][39]. This should be noted that at higher testing load of 4 N, the As PTA Stellite 12 specimen is unable to resist carbide cracking and removal due to nature of coarse Cr-rich carbides [26].…”

Section: Discussionsupporting

confidence: 65%

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Enhanced wear resistance of Stellite 12 by Mo addition and LSM

Dilawary

Motallebzadeh

Akhter

et al. 2018

Surface Engineering

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Aiming at additional improvements in the properties of Stellite 12 PTA hardfacing alloy deposited on 4140 steel substrate, the authors have adopted a dual approach. During PTA deposition Stellite 12 hardfacing powder was alloyed with 10 wt-% Mo, followed by laser surface melting (LSM). Addition of 10 wt-% Mo, led to an increase in the volume fraction of Co and W-rich complex carbides. Later on LSM executed on the PTA led to the development of unique microstructure near the surface, characterised by the segregation of hard Cr-rich carbides. The resultant layers were subjected to mechanical characterisation, at room temperature, e.g. hardness and wear resistance. It was concluded that combining both approaches i.e. addition of Mo during the hardfacing process followed by LSM of deposited layer gave additional improvements in mechanical properties owing to evolution of a unique carbide structure.

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Section: Discussionsupporting

confidence: 65%

“…For the Mo-added ‘As PTA’ specimen there has been clear evidence of plastic damage resulting in ploughing and stair casing [36-39]. However, the carbide cracking and removal is still absent in this specimen due to larger volume fractions of crack-resistant complex carbides.…”

Section: Discussionmentioning

confidence: 99%

Enhanced wear resistance of Stellite 12 by Mo addition and LSM

Dilawary

Motallebzadeh

Akhter

et al. 2018

Surface Engineering

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“…The lubricating effect of the oxide film was beneficial to reducing the wear rate, which also resulted to a lower friction coefficient and a smaller material loss. In the final stage, the principal mechanism of friction was the delamination wear [29]. In this stage, continuous cutting induced oxide film spalling from the surface of Zr-Y alloyed layer and then a new bare surface oxidised again, entering to a new circle.…”

Section: Wear Propertiesmentioning

confidence: 99%

Tribological behaviour of double-glow plasma zirconium-yttrium alloying on γ-TiAl

Huang

Zhang

Wei

et al. 2017

Surface Engineering

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A Zr-Y alloyed layer was prepared onto the surface of γ-TiAl using double-glow plasma surface alloying technique (DG technique). The results showed that the Zr-Y alloyed layer was comprised of deposited sub-layer and diffused sub-layer, with a total layer thickness of about 20 μm. The nano-indentation test result showed that the nano-hardness of Zr-Y alloyed layer was 2.35 times that of γ-TiAl. The scratch test was carried to evaluate the adhesion strength of Zr-Y alloyed layer. The tribological behaviours were investigated both at ambient temperature and 500°C. Under dry sliding condition, the friction coefficient of the Zr-Y alloyed layer was lower than that of the γ-TiAl. The specific wear rate of γ-TiAl in the presence of Zr-Y alloyed layer was approximately one fifth that in the absence of the alloyed layer. The excellent wear resistance of Zr-Y alloyed layer could be attributed to the high hardness or load-carrying ability.

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“…The effects of ammonia flow rate on the microstructure, distortion, hardness and strength have been investigated, but still focused on the low carbon steel [16] . Abrasion with shallow and narrower wear track was the predominant wear mechanism of carbonitrided AISI 8620 at 50 N; whereas, high friction sliding mechanism at 150 N was controlled by plastic deformation [17] . However, the microstructure evolution on high carbon chromium bearing steel during carbonitriding and the friction behavior of carbonitrided specimens are extremely meager and uncomprehensive.…”

Section: Introductionmentioning

confidence: 96%

Effect of ammonia addition on microstructure and wear performance of carbonitrided high carbon bearing steel AISI 52100

Liu

Wang²,

2019

Surface and Coatings Technology

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The investigation on the microstructure and tribomechanical behavior of hypereutectoid bearing steel AISI 52100 has been carried out during an unconventional thermo-chemical process aiming to improve the wear performance under dry conditions. The effects of NH 3 addition rate on microstructure, hardness and wear performance of the carbonitrided specimen were characterized and the results show that two types of nitride (CrN, (Cr,Fe)2N1-x) are formed in the surface layer. The quantity of the nitride and carbide precipitates increase firstly and decrease subsequently with the increasing of NH 3 addition rate, whereas the fraction of retained austenite increases monotonically.The wear performance of the carbonitrided specimen is improved during the entire stage of the sliding test with the NH 3 addition rate below 0.4 l/min, but it decreases sharply at the initial stage of sliding test and then increases gradually when further raising the NH3 addition rate. The possible reasons underlying have been discussed and are attributed to the fraction of retained austenite formed during carbonitriding process and the transformation from retained austenite into martensite during sliding test, respectively.

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Sliding wear behaviour and its mechanisms of carbonitrided AISI 8620 steel at 100°C under unlubricated conditions

Cited by 7 publications

References 25 publications

Enhanced wear resistance of Stellite 12 by Mo addition and LSM

Enhanced wear resistance of Stellite 12 by Mo addition and LSM

Tribological behaviour of double-glow plasma zirconium-yttrium alloying on γ-TiAl

Effect of ammonia addition on microstructure and wear performance of carbonitrided high carbon bearing steel AISI 52100

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