Carburizing: Microstructures and Properties by Geoffrey Parrish

By Geoffrey Parrish

Distinct discussions and over 250 graphs and charts describe the results of microstructure at the homes of carburized stees. In-depth assurance clarifies the factors, interpretation, prevention, and effects of assorted microstructural adaptations and defects in carburized components. additionally lined are the consequences of post-hardening warmth remedies, floor grinding, and shot peening. Contents: inner Oxidation Decarburization Carbides Retained Austinite Grain dimension, Microsegregation, and Microcracking center homes and Case intensity publish Hardening warmth remedies submit Carburizing Mechanical remedies.

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2 Fig. 3 Decarburization due to moisture in the furnace fireclay lining. Source: Ref 5 20 Dew point. OF 40 60 60 90 Timeat temperature. min 120 Fig. 5 Depth of decarburization of a cold-work steel in a fluidized bed in air. ,----,---r--------, Upto 900 °C '" '" '. rfl. : ~ ~ ' . _+--__:_t--____j .............. J,----J -30 -20 -10 0 10 20 Dew point. °C 30 40 Fig. 4 Variation of carbon potential with dew point for an endothermic-based atmosphere containing 20% CO and 40% H 2 in contact with plain-carbon steel at various workpiece temperatures.

However, a good dense martensitic surface layer with free carbides or fair amounts of retained austenite beneath it is an indicator of a negative carbon gradient (upper curve, Fig. 12b). It is then necessary to conduct chemical analysis to confirm any suspicions of this condition. Influence on Material Properties Influence on Hardness. Shallow decarburization, or a minor reduction of the surface carbon content, does not greatly influence the surface macrohardness of a case-hardened part. In such an instance, the hardness could be either increased or decreased by some small, and possibly insignificant, amount.

6), June 1997, p 1021-1035 • G. Prunel, Internal Oxidation During the Carburizing of Gears, Trait. 1361/cmap1999p037 Copyright © 1999 ASM International® All rights reserved. org Chapter 2 Decarburization Decarburization, as the term implies, is a loss of carbon atoms from the surface of the workpiece, thereby producing a surface with a lower carbon content than at some short distance beneath the surface. If carburization promotes a positive carbon gradient, then decarburization promotes a negative carbon gradient.

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