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- W1567894503 abstract "This thesis describes a study of the nitridingbehaviour of some aluminium-containing low alloy steels withand without chromium. The main aim of the study has beento establish the relationship between prior heat treatmentand nitriding process variables on the nitriding response ofthe aluminium containing steels. Emphasis was placed onestablishing the metallography of the steels nitrided undercontrolled conditions, using transmission electron microscopy of thin foils and carbon replicas, optical microscopy and microhardness measurements. A potentiostatic etching method was used for the extraction of carbides and nitrides, and those phases which were present were determined by X-ray diffraction and X-ray microanalysis.In addition to the known nitride phases, i. e. f. c. cCrN and hexagonal A1N, another phase with a-Fe type d-spacing was observed, and subsequently identified as f. c. c. A1N of NaCl structure with a ti 4.05 A. This phase transforms to hexagonal A1N if the nitrided specimen is annealed at 700°C. The latter phase was found to be rich in silicon. Unlike CrN, the precipitation of A1N is greatly influenced by the nitriding temperature and the NH3 content of the gas mixture.The formation of the carburized layer depends onthe internal compressive stress of nitrided layer. The sizeof the carbides is an important factor in the formation ofthis layer. Larger: carbides are more stable and less likelyto dissolve during nitriding. In bulk specimens, nitridedin high NH3 content so as to form a white layer on thesurface, carbide concentration takes place under the whitelayer.The effect of process variables on the fatigue resistance of nitrided steel has been investigated. Specimens of Nitralloy En41A have been gas nitrided undercontrolled conditions to produce steep and shallow case-hardness profiles with and without white layer. The resultant fatigue properties have been related to the microstructure, hardness profile, residual stress and case depth. The fatigue resistance of the nitrided En41A steel depend on the residual stress level in the case, and to a certain extent on the microstructure of the nitrided layer.Nitriding at 570°C produces low residual stress and alsocauses embrittlement of the nitrided layer." @default.
- W1567894503 created "2016-06-24" @default.
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- W1567894503 date "1984-01-01" @default.
- W1567894503 modified "2023-09-27" @default.
- W1567894503 title "Nitriding of aluminium-containing steels" @default.
- W1567894503 hasPublicationYear "1984" @default.
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