Carburizing: Microstructures and Properties by Geoffrey Parrish

By Geoffrey Parrish

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

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13a and b and Fig. ---I---+-_+-_____1 'if. :---:-:-:::--"'~--=-=---=,"=---;'-;:----7:=----;' o Fig. 0 Depth belowsurface. 2 Typesof carbon profiles. 4 (b) Fig. 11 Micrographs showing different degrees of decarburization. (a) Total decarburization caused by severe furnace leak during gas carburization of 1018 steel (l % nital etch, 500x). (b) Partially decarburized specimen. 190x Decarburization / 43 The surfaces of quenched parts that have suffered partial decarburization will likely be bainitic or even martensitic depending on the alloy content.

Tests showed that fracture toughness increased with distance from the surface (Ref 38), and that crack initiation was influenced by case hardenability (the ability to produce martensite throughout the case); crack propagation, however, was more influenced by the core properties and composition (Ref 39). ;;. b Depth 01 surface material removed. ;;. :.. :.. ) 107 2 (b) Fig. 24 Effectof internal oxidation and high-temperature transformation products on the high- and low-cycle bending fatigue strength.

Fum. Y. C. Chang, The Oxidation and Carburization of Fe-Mn-Al Alloys in a Carbon-Containing Atmoshere, Corros. 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.

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