The graph shows thermogravimetric uptake curves for nitriding of AISI 316 at 445°C (830°F) in different NH3-H2 gas mixtures.
Continue readingOne Minute Mentor: Solubility of Nitrogen in Expanded Austenite
The graph shows the solubility of nitrogen in expanded austenite (?N) as a function of the imposed nitrogen activity (aN) in a gas mixture of NH3 and H2 for the stainless steels and temperatures indicated in the legend.
Continue readingOne Minute Mentor: Physical Metallurgy of Expanded Austenite
The microstructural feature responsible for the favorable technological properties resulting from low-temperature gaseous thermochemical treatment is a supersaturation of nitrogen and/or carbon in austenite. This is called expanded austenite.
Continue readingOne Minute Mentor: Low-Temperature Surface Hardening of Stainless Steel
The graph shows a schematic time-temperature-transformation (TTT) diagram of austenite with a high nitrogen or carbon content. In order to prevent the development of chromium nitrides/carbides, a long-time low-temperature treatment could be applied.
Continue readingOne Minute Mentor: High-Temperature Nitriding for Deeper Case
High-temperature nitriding or solution nitriding at temperatures of 2010 ± 90°F is a new treatment available to produce cases with nitrogen concentrations in the range of 0.4 to 0.9 wt%, which is low compared to plasma nitriding treatments at low temperature (up to 16.9wt% N), but the resulting case is up to 100 times deeper (2 mm, or 0.08 in.).
Continue readingOne Minute Mentor: Plasma Nitriding
Plasma nitriding is a surface-hardening process in which glow-discharge technology introduces nascent (atomic) nitrogen into the surface of a metal part for subsequent inward diffusion
Continue readingOne Minute Mentor: Carburizing Tool Steels
P20 mold steel is seldom carburized for molds used in compression molding, particularly for molding the more abrasive plastics.
Continue readingOne Minute Mentor: How Austenitizing Temperature Affects High-Temperature Hardness
The austenitizing temperature affects not only the final hardness but also the grain size.
Continue readingOne Minute Mentor: Heat Treatment of a Premium Grade H13 Die
The graph shows a continuous cooling test in which the austenitizing temperature was approximately 1040°C (1900°F).
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