Nature of phases in boronized H11 hot work tool steel

Jurči, Peter; Hudáková, Mária; Kusý, Martin

doi:10.4149/km_2012_3_177

Cited by 8 publications

(11 citation statements)

References 11 publications

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“…This value is approximately 10 times higher compared to the steel substrate (135 HV0.1, Table 3). The reported microhardness of FeB is 2000-2200 HV0.1 [20][21][22]. Since these values have not been observed in the present study it can be suggested that the amount of FeB in the boride layer was very small.…”

Section: Microstructure and Phase Constitution Of Boride Coatingscontrasting

confidence: 37%

“…In previous studies, we have investigated the microstructure, phase constitution and microhardness of boride layers prepared by diffusion boronizing [21,22,31]. In the present work, we aim to investigate the high temperature oxidation behavior of boride coatings.…”

Section: Introductionmentioning

confidence: 99%

“…The phase formation depends on boron concentration, alloy chemical composition, temperature, processing time and boronizing method [20]. Single-phase Fe 2 B layers are preferred since Fe 2 B is less brittle compared to FeB and forms a surface with a high compressive stress [21,22]. Furthermore, Fe 2 B has a favorable thermal expansion coefficient.…”

Section: Introductionmentioning

confidence: 99%

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Oxidation stability of boride coatings

Ptačinová¹,

Drienovský²,

Palcut³

et al. 2016

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In this work, plain, low carbon steel S235JRG1 was boronized at 1273 K for 45-150 min by using a Durborid powder. The microstructure, phase constitution and oxidation behavior of the resulting boride layers have been investigated. Layers with an average thickness of 76-123 µm have been produced. The boride layer has a distinct tooth-like microstructure. It is composed of Fe2B and FeB in unequal amounts. The boride layer oxidation behavior has been investigated by a simultaneous thermal analysis in a flowing synthetic air at 873-1173 K for 21-24 h. A parabolic oxidation of the boride layer has been observed. The rate constants are found between 1.039 × 10 −9 to 3.781 × 10 −6 kg 2 m −4 s −1 , depending on temperature and oxidation time. The activation energy of oxidation at temperatures below 1173 K has been estimated to be 93 kJ mol −1 . At 1173 K, two successive parabolic periods have been found, followed by a breakaway oxidation behavior. The oxide scale of the boronized steel is composed of different iron oxides and iron borates. The oxidation mechanisms of boride coatings are discussed and implications towards high temperature stability are provided.K e y w o r d s : boronizing, high temperature oxidation, X-ray diffraction, thermogravimetric analysis

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Section: Microstructure and Phase Constitution Of Boride Coatingscontrasting

confidence: 37%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Oxidation stability of boride coatings

Ptačinová¹,

Drienovský²,

Palcut³

et al. 2016

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“…Better result was found at the intermediate region and they developed new carbides which were identified as M 23 C 6 . The hardness of boride layer is depended on time and temperature like the other studies (Jurci et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…The other boronizing process was done by Jurci et al (2012). Process was carried out at 1030 °C for 30 min, 45 min, 75 min, 150 min.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ekabor 2 powder on the mechanical properties of pure iron powder metal compacts

Altintaş¹,

Sarigün²,

Çavdar³

2016

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Ekabor 2 powder of different weights, used by V type powder mixture was mixed with pure iron powder. Specimens were created by dry pressing into die followed by cold isostatic press at a pressure of 100 bar for purpose of resizing. The conventional sintering process at 900 °C and 950 °C was carried out for 4 h using conventional furnaces. Specimens were gradually cooled by air. The sintered pellets were examined in terms of density, wear abrasion, surface roughness and hardness at 900 °C and 950 °C. Microstructure of pellets was observed with optic microscope. The results show that the hardness gradually increased with additions of 0 wt. % to 10 wt. % of Ekabor 2 however, after 10 wt. %, this hardness tended to decrease. RESUMEN: Efecto del polvo "Ekabor 2" en las propiedades mecánicas del hierro puro como material compacto pulvimetalúrgico.Se mezclaron diferentes cantidades de polvo denominado "Ekabor 2", el cual se utiliza en mezclas de polvo tipo V, con hierro puro en polvo. La muestras se obtuvieron por prensado en seco seguido de prensa isostática en frío a una presión de 100 bar, con el objeto de redimensionar la muestra. Se llevó a cabo el proceso de sinterización convencional a 900 °C y 950 °C durante 4 h utilizando hornos convencionales. Las muestras se enfriaron gradualmente en aire. Las pastillas sinterizadas (pellets) se examinaron en términos de densidad, resistencia a la abrasión, rugosidad y dureza a 900 °C y 950 °C. Se observó la microestructura de las pastillas por microscopía óptica. Los resultados mostraron un aumento gradual de la dureza con la adición de 0 % en peso a 10% en peso de polvo Ekabor 2. Sin embargo, para mayores cantidades del 10% en peso se observó una tendencia a disminuir en la dureza.

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