By David Pye
Textual content is meant to aid practitioners within the daily technique of nitriding and ferritic nitrocarburizing. Addresses very important questions, similar to what furnace could be used, how should still the method be managed, how should still the metal be ready, and the way may still the metal be dealt with after nitriding? DLC: Nitriding.
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Additional info for Practical Nitriding and Ferritic Nitrocarburizing
G. 1361/pnafn2003p023 CHAPTER Copyright © 2003 ASM International ® All rights reserved. org 3 How Does the Nitriding Process Work? SEVERAL PROCESS PARAMETERS must be considered in order to ensure nitriding success in terms of metallurgy and distortion: • • • • Nitrogen source Heat Time Steel composition In gas nitriding the nitrogen source is almost always derived from the decomposition (or dissociation) of ammonia gas supplied via an external bulk storage system or individual bottles connected to a manifold (Fig.
Nitriding of pure iron at temperatures up to 590 °C (1094 °F) with an increasing nitrogen content, according to the binary Fe-N phase diagram (see Fig. 1% N Hexagonal (epsilon) (ε) nitride, Fe2-3N, which exists in the range of 8 to 11 wt% N Orthorhombic zeta (ζ), Fe2N, forms at temperatures below 500 °C (930 °F) and nitrogen contents exceeding 11 wt%—conditions that are not used in nitriding practice. ” This process is shown schematically in Fig. 2. qxd 9/30/03 9:59 AM Page 25 Chapter 3: How Does the Nitriding Process Work?
Qxd 9/30/03 9:58 AM Page 22 22 / Practical Nitriding and Ferritic Nitrocarburizing If the steel is nitrided at a temperature below that of the final tempering temperature, then the core hardness value will not be affected. A process temperature approximately 55 °C (100 °F) below the final tempering temperature generally is selected. Concluding Remarks The nitriding process was first put to commercial use in the automotive industry on transmission gears, particularly spiral bevel pinions and spiral bevel gears because of their natural tendency to try to “straighten” at the heat treatment process temperature.
Practical Nitriding and Ferritic Nitrocarburizing by David Pye