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The effect of microstructure and strength on the fracture toughness of an 18 ni, 300 grade maraging steelMethods for increasing the strength of maraging steels are discussed. An investigation was conducted to systematically vary the strength of 18 weight percent nickel, 300 grade maraging steel, to isolate any attending microstructural changes, and to study the effects of these changes on the fracture toughness of the alloy. A study aimed at determining the aging behavior of the program alloy was carried out to provide data by which to estimate yield strength. The effects of various alloying materials on the strength of the maraging steel are examined. The mechanical properties of the 300 grade maraging steel were determined by tension tests, fatigue precracked Charpy impact tests, and plane strain fracture toughness tests.
Document ID
19740023874
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Psioda, J. A. (Carnegie-Mellon Univ. Pittsburgh, PA, United States)
Low, J. R., Jr. (Carnegie-Mellon Univ. Pittsburgh, PA, United States)
Date Acquired
September 3, 2013
Publication Date
August 1, 1974
Subject Category
Materials, Metallic
Report/Patent Number
NASA-CR-139673
TR-6
Report Number: NASA-CR-139673
Report Number: TR-6
Accession Number
74N31987
Funding Number(s)
CONTRACT_GRANT: NGR-39-087-003
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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