The wear performance of yttrium-modified Stellite 712 at elevated temperatures

Radu, Iulian; Li, D.Y.

doi:10.1016/j.triboint.2005.09.027

Cited by 32 publications

(19 citation statements)

References 17 publications

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“…Therefore, this alloy is generally employed in the form of coating in order to protect different metallic substrates like stainless steels and superalloys against corrosion and wear particularly at elevated temperatures (Ref 5). Stellite 6 coatings have extensive applications in aerospace and automotive industries (coatings on gas turbines and exhaust parts), petroleum industries (coatings on gate valves and drilling components), energy conversion industries (coatings on boilers and turbines), etc (Ref [6][7][8][9][10]. Various thermal spray techniques such as atmospheric plasma spraying (APS) and high velocity oxygen fuel (HVOF) have been utilized to deposit Stellite 6 alloy, but the as-sprayed coatings suffer from several drawbacks.…”

Section: Introductionmentioning

confidence: 99%

Laser Surface Treatment of Stellite 6 Coating Deposited by HVOF on 316L Alloy

Razavi

2016

J. of Materi Eng and Perform

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This research aimed to study the effects of laser glazing treatment on microstructure, hardness, and oxidation behavior of Stellite 6 coating deposited by high velocity oxygen fuel (HVOF) spraying. The assprayed Stellite 6 coating (ST-HVOF) was subjected to single-pass and multiple-pass laser treatments to achieve the optimum glazing parameters. Microstructural characterizations were performed by x-ray diffractometry and field emission scanning electron microscopy equipped with energy-dispersive spectroscopy. Two-step optimization showed that laser treatment at the power of 200 W with a scan rate of 4 mm/s causes a surface layer with a thickness of 208 ± 32 lm to be remelted, while the underlying layers retain the original ST-HVOF coating structure. The obtained sample (ST-Glazing) exhibited a highly dense and uniform structure with an extremely low porosity of $0.3%, much lower than that of ST-HVOF coating (2.3%). The average microhardness of ST-Glazing was measured to be 519 Hv 0.3 indicating a 17% decrease compared to ST-HVOF (625 Hv 0.3 ) due to the residual stress relief and dendrite coarsening from submicron size to $3.4 lm after laser treatment. The lowest oxidation mass gain was obtained for STGlazing by 2 mg/cm 2 after 8 cycles at 900°C indicating 52 and 84% improvement in oxidation resistance in comparison to ST-HVOF and bare 316L steel substrates, respectively.

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Section: Introductionmentioning

confidence: 99%

Laser Surface Treatment of Stellite 6 Coating Deposited by HVOF on 316L Alloy

Razavi

2016

J. of Materi Eng and Perform

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“…Recent studies have demonstrated that the high-temperature wear resistance of cobalt-based alloys in air is markedly improved by adding yttrium [2][3][4] mainly through enhancing their oxide scales, since in argon the alloyed yttrium does not show any benefit to the wear resistance as illustrated in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

A Further Study of the Beneficial Effects of Yttrium on Oxide Scale Properties and High-Temperature Wear of Stellite 21

Radu

2008

Tribol Lett

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Alloying yttrium to Co-based alloys has been proven to considerably improve their oxide scales that play an important role in resisting wear at elevated temperatures. In addition to the formation of Y 2 O 3 phase in the oxide scale, the yttrium addition may also change the oxidation mechanism, which could be responsible for many benefits of yttrium to the wear resistance of this alloy at elevated temperatures. In this study, the effect of yttrium on the oxidation behavior of Stellite 21 alloy was investigated and correlated to the changes in microstructure and improvement in properties of the oxide scale formed at 600°C which in turn improved high-temperature wear behavior.

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“…Stellite 6 alaşımında, Cr, M7C3 ve M23C6 karbürlerin oluşmasıyla birlikte, oksidasyon, aşınma direnci ve mukavemet sağlar. Stellite alaşımlarının güçlendirilmesi için, refrakter elementler (tungsten veya molibden) ile katı eriyik sertleşmesine ve karbür çöktürmesine katkıda bulunurlar [16][17].…”

Section: Eds Analiziunclassified

TIG Yöntemi ile Ostenitik Paslanmaz Çelik Yüzeyine Kaplanan Stellite 6+FeMo Tabakasının Mikroyapı ve Sertlik Özelikleri Üzerine Etkisinin İncelenmesi

Çolak

Turhan²

2018

Bitlis Eren Üniversitesi Fen Bilimleri Dergisi

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Bu çalışmada, AISI 304 östenitik paslanmaz çelik yüzeyi Tungsten Inert Gas (TIG) kaynak yöntemi kullanılarak Stellite 6+FeMo alaşımı ile kaplanmıştır. Kaplanan tabakanın mikro yapısı, optik mikroskop (OM), taramalı elektron mikroskobu (SEM) ile incelenip yoğun enerjili X ışını analizi (EDS) ile analiz edilmiştir. Ayrıca numunelerin sertlik dağılımları mikro ve makro sertlik ölçümleri ile değerlendirilmiştir. Optik mikroskop ve mikroyapı incelemeleri neticesinde, kaplama tabakası ile alt tabakanın birbirlerine bağlandığı, kaplamada FeMo tozu ilavesine bağlı olarak sertlik değerlerinin arttığı ve tane sınırlarında ince taneli dentritik yapıların meydana geldiği tespit edilmiştir. Yüzey kaplama işlemi ile altlık metale göre daha sert ve dolayısıyla dış etkilere karşı daha mukavemetli bir yüzey tabakası elde edilmiştir.

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The wear performance of yttrium-modified Stellite 712 at elevated temperatures

Cited by 32 publications

References 17 publications

Laser Surface Treatment of Stellite 6 Coating Deposited by HVOF on 316L Alloy

Laser Surface Treatment of Stellite 6 Coating Deposited by HVOF on 316L Alloy

A Further Study of the Beneficial Effects of Yttrium on Oxide Scale Properties and High-Temperature Wear of Stellite 21

TIG Yöntemi ile Ostenitik Paslanmaz Çelik Yüzeyine Kaplanan Stellite 6+FeMo Tabakasının Mikroyapı ve Sertlik Özelikleri Üzerine Etkisinin İncelenmesi

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