Contact fatigue performance of cobalt boride coatings

Meneses-Amador, A.; Sandoval-Juárez, D.; Rodríguez-Castro, G.A.; Fernández-Valdés, D.; Campos-Silva, I.; Morón, R.C.; Arciniega-Martínez, J.L.

doi:10.1016/j.surfcoat.2018.07.104

Cited by 21 publications

(2 citation statements)

References 29 publications

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“…Pack boriding methods present the simplest experimental setup, compared to the other boriding methods, but higher temperatures and longer treatment times are required [14]. Pack boriding has been recently studied in the boriding of titanium-based alloys [14][15][16][17][18][19], steel alloys [6-8, 10, 20-26], cobalt-base alloys [9,[27][28][29][30][31], and nickel-base alloys [32][33][34], and is usually performed using commercial powder mixtures, however, the pack boriding of steel and iron with different powder compositions was previously investigated [2,10,17,19,26,35,36]. The borided layers in carbon and alloyed steels usually have the Fe 2 B single-phase or a two-phase morphology: FeB and Fe 2 B.…”

Section: Introductionmentioning

confidence: 99%

Effects of boron concentration on the microstructure, mechanical and tribological properties of powder-pack borided AISI 4140 steel

Silveira

Pukasiewicz²,

Souza³

et al. 2022

Preprint

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Three different boron amounts were used in this study to control the microstructure, mechanical, and tribological properties of borided cases on AISI 4140 steel. A single Fe2B phase was observed for the lowest boron amount, while both Fe2B and FeB phases were present on the other two boron compositions. The highest surface hardness was observed in the highest boron amount. The scratch tests revealed different cohesive failure mechanisms on the samples, such as arc and chevron tensile cracks, and even chipping was observed for all three-studied boron amounts; it appeared at lower applied loads for the highest boron amount, indicating a likely detachment of the fragile FeB layer. The borided layers presented abrasive wear during the ball-on-flat wear tests. Despite the lower specific wear rate, the surface damage was more severe in the sample with the highest boron amount, due to its brittleness, resulting in lower resistance to surface fatigue.

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Section: Introductionmentioning

confidence: 99%

Effects of boron concentration on the microstructure, mechanical and tribological properties of powder-pack borided AISI 4140 steel

Silveira

Pukasiewicz²,

Souza³

et al. 2022

Preprint

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“…Yüzey dayanımını artırma yöntemlerinden olan borlama, malzemelerin yüzey direncini artırma konusunda en etkili yöntemlerden biridir [1][2][3]. Yüksek aşınma ve oksidasyon direnci diğer yöntemlere göre borlamada en büyük avantajlar arasındadır [4,5].…”

Section: Introductionunclassified

%3 Mg içeren Borlanmış Co-Mg Alaşımının Yüzey Özelliklerinin İncelenmesi

Yildiz

Güneş

2019

El-Cezeri Fen Ve Mühendislik Dergisi

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Bu çalışmada, %97 Co ve %3 Mg içeren Co-Mg alaşımına borlama işlemi gerçekleştirilmiştir. Co-Mg alaşım malzemesini üretmek için toz metalurjisi (TM) yöntemi kullanılmıştır. Bu yöntemde, Co ve Mg metal tozları kapalı kaplar içerisinde homojen bir şekilde karıştırılarak şekillendirilmeleri için özel olarak tasarlanmış silindirik kalıplara dökülmüştür. Tek eksenli preste 300 bar basınç altında preslendikten sonra Argon gazı atmosferi ortamında 530 °C sıcaklıkta sinterlenmiştir. Sinterlenerek üretilen numunelere sırasıyla sertlik, yoğunluk ve yüzey pürüzlülüğü testleri uygulanmıştır. Sertlik testi sonrası 123 HV 0,05 değeri elde edilirken ölçülen yoğunluk değeri ise 4,95 gr/cm 3 olarak bulunmuştur. Bu işlemler sonrasında numuneler kapalı fırın ortamında 850 ve 900 °C sıcaklık ve 1.5-4.5 saat değişen sürelerde borlama işlemi gerçekleştirilmiştir. Bu işlem sonrasında SEM ve XRD analiz çalışmaları yapılmıştır. Analiz sonrasında borür tabakaları 850 °C sıcaklıkta 1,5 saat sürede 55 µm olarak bulunurken en yüksek 900 °C sıcaklık 4,5 saat sürede 140 µm olarak ölçülmüştür. Borlanmış Kobalt-Magnezyum alaşımlarına uygulanan XRD analizi sonucunda CoB, Co 2 B ve Co fazları elde edilmiştir. Mg elementinin hızlı bozulma özelliğinden dolayı yapılarda kısmende olsa boşluklar oluşmuştur.

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Dry Sliding Wear Test on Borided AISI 1018 Steel Under Pin-on-Disc Configuration

Sánchez-Islas

Martínez-Trinidad

Campos-Silva

et al. 2021

Metall Mater Trans A

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New results about the influence of a small iron borided layer (~36 lm) obtained by the powder-pack boriding process (PPBP) and diffusion annealing post-process (DAP) were evaluated. Dry sliding wear tests on PPBP, PPBP + DAP and untreated AISI 1018 steel were performed under the pin-on-disc configuration, and balls of Al 2 O 3 and WC were used as a counterpart at different sliding distances. Also, the contact pressures of the layer/substrate system were evaluated using the finite element model with the aid of the ABAQUS software. The results showed that the Al 2 O 3 ball presented the major coupling (ball-disc), and the PPBP + DAP reduces the specific wear rate around ~304 times related to the untreated AISI 1018 steel to 500 m under severe sliding conditions.

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Contact fatigue performance of cobalt boride coatings

Cited by 21 publications

References 29 publications

Effects of boron concentration on the microstructure, mechanical and tribological properties of powder-pack borided AISI 4140 steel

Effects of boron concentration on the microstructure, mechanical and tribological properties of powder-pack borided AISI 4140 steel

%3 Mg içeren Borlanmış Co-Mg Alaşımının Yüzey Özelliklerinin İncelenmesi

Dry Sliding Wear Test on Borided AISI 1018 Steel Under Pin-on-Disc Configuration

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