By Geoffrey Parrish
Unique discussions and over 250 graphs and charts describe the consequences of microstructure at the houses of carburized stees. In-depth assurance clarifies the factors, interpretation, prevention, and results of assorted microstructural adaptations and defects in carburized components. additionally coated 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 middle houses and Case intensity submit Hardening warmth remedies put up Carburizing Mechanical remedies.
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Additional resources for Carburizing: Microstructures and Properties
5 7 7 Hardness(a), HK 820 811 751 695 626 Surface residualslresses, MPa -40 +10 +140 +270 >270 Reheated 10 810 DC for I h, oil quenched at 55 DC, tempered at 150DC for 2 b. (a) I kg load. Source:ReflO Decarburization /41 tent C being formed in equilibrium with material of carbon content B. Therefore, because the atmosphere is decidedly decarburizing in nature, a further lowering of the average surface carbon content must result in the development of ferrite containing carbon to the equilibrium value C (curve 2, Fig.
C. W. Wegst, Stahlschliissel, Verlag Stahlschllissel Wegst KG, Marbach, Germany, 1977, p 14 26. Y. S. Y. F. Nikanov, The Increase in the Strength of Teeth of Carburised and Carbonitrided Gears, Met. Sci. Heat Treat. (USSR) (No. 10), Oct 1970, Plenum Publishing, p 867-871 27. G. S. Harper, Production Gas Carburising, Pergamon Press, 1985 28. A. Kanunnikova, Residual Stresses in the Teeth of Quenched Gears, Met. Sci. Heat Treat. (USSR), (No. 11), Nov 1970, P 909-913 29. T. Naito, H. Ueda, and M. Kikuchi, Fatigue Behaviour of Carburised Steel with Internal Oxides and Non-Martensitic Microstructure Near Surface, Metall.
Consequently, when the whole of the case has eventually transformed, the surface will be in less compression, or even in tension, compared with a fully martensitic microstructure. An example of the influence of decarburization on residual stresses within a carburized surface is shown in Fig. 15. With no decarburization present and a surface carbon content of about 1%, the residual compressive stresses at the surface are in excess of 392 MPa (40 kg/mm 2). 3 mm, the residual stresses at the surface are virtually zero.