Computer-based simulation of high-temperature corrosion phenomena

Trindade, Vicente Braz; Krupp, Ulrich; Christ, Hans‐Jürgen

doi:10.1590/s0103-50532008000100022

Cited by 3 publications

(2 citation statements)

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“…Nitriding process is still not really efficient and effective compared to another thermochemical treatment [1]. The ununiformed diffusion has a dominant role in causing the failure of fatigue fracture, ductile fracture, and brittle fracture [2]. Those can be anticipated by controlling the surface layer formation by nitriding process.…”

Section: Introductionmentioning

confidence: 99%

The Comparison of Nitrogen Atom Solubility in the Formation of Surface Layer on Stainless Steel and Alloy Steel

Widi¹,

Sujana²,

Rahardjo³

2020

MSF

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The chrome alloy has better affinity with nitrogen atom in nitriding process than any other alloy elements in steel. The higher content of chrome element binds larger number of nitrogen atoms. However, the higher concentration of nitrogen atom on the surface of the steel does not often make thicker case depth. This study clarified the phenomenon. The nitriding process was performed in two stages, namely the boost stage in the fluidized bed with the composition of 80 % NH3 and 20 % of N2 in 4 hours at 550 °C. Subsequently, the diffusion process was carried out in fluidized bed with the gas composition of 100 % N2 HP (high purity) in 2 hours. The chemical composition was measured by spectrometry and EDAX. The case depth was identified by micro-Vickers, and metallography was observed by SEM. The concentration of nitrogen atom on the surface of AISI 316 L is twice higher than that on the AISI 4140. The result shows that 0.1 to 1 wt % of nitrogen atom creates diffusion layer, 1 to 5 wt % of nitrogen atom produces nitride layer of γꞌ and ε, and nitrogen atom above 5 wt % forms white layer. The layer strongly depends on the percentage of nitrogen atom concentration. The nitrogen atom concentration is determined by the concentration of chromium element within the steel (AISI 316 L). Meanwhile, the depth of nitrogen atom diffusion is highly determined by the alloy element of Fe (AISI 4140).

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Section: Introductionmentioning

confidence: 99%

The Comparison of Nitrogen Atom Solubility in the Formation of Surface Layer on Stainless Steel and Alloy Steel

Widi¹,

Sujana²,

Rahardjo³

2020

MSF

View full text Add to dashboard Cite

show abstract

“…La oxidación interna se produce sólo si la difusión hacia el exterior de los elementos activos es menor que la difusión interna del oxígeno. Como en el ejemplo de la Figura 2.24 donde se muestra la zona de oxidación interna de Al 2 O 3 formada en una aleación IN625 cuando fue sometida a oxidación a una temperatura de 1 000 ºC según los estudios de (Trindade, Krupp, & Christ, 2008 Este grupo incluye bases de aleación, tales como Au, Ag, Pt, etc., que no forman óxidos estables en condiciones normales con elementos de aleación, tales como Cu, Ni, Fe, Co, Cr, Al, Ti, In, Be, etc., que sí forman óxidos estables. Sin embargo, a presión parcial reducida de oxígeno, esos metales, tales como Cu, Ni, y Co, que tienen sólo óxidos estables en cantidad moderada, pueden comportarse como metales nobles.…”

Section: óXidos Formados Por Elementos Puros Y Sus Propiedadesunclassified