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Improved fracture toughness corrosion-resistant bearing material

Content Provider	NASA Technical Reports Server (NTRS)
Author	Bamberger, E. N. Nahm, A. H.
Copyright Year	1986
Description	A development program was performed to establish whether a corrosion-resistant bearing material, such as a 14Cr steel, could be modified to allow carburization, thereby providing the excellent fracture toughness characteristics feasible with this process. The alloy selected for investigation was AMS 5749. Several modifications were made including the addition of a small amount of nickel for austenite stabilization. While some promising results were achieved, the primary objective of an acceptable combination of case hardness and microstructure was not attained. Because the high chromium content presents a serious problem in achieving a viable carburizing cycle, a number of experimental steels having lower chromium contents (8 to 12%) were produced in laboratory quantities and evaluated. The results were basically the same as those initially obtained with the modified AMS 5749. Corrosion tests were performed on AMS 5749, AISI M50, and 52100 bearing steels as well as some of the lower chromium steels. These tests showed that a reduced chromium level (10 to 12%) provided essentially the same corrosion protection as the 14Cr steels.
File Size	4917922
Page Count	84
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19860023271
Archival Resource Key	ark:/13960/t4gn3379n
Language	English
Publisher Date	1986-01-01
Access Restriction	Open
Subject Keyword	Mechanical Engineering Corrosion Resistance Chromium Steels Rolling Contact Loads Bearings Fatigue Materials Corrosion Tests Chemical Composition Carburizing Fracture Strength Electron Microscopy Hardness Microstructure Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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