Accession Number:

AD0605862

Title:

EVALUATION OF HIGH NICKEL STEEL FOR APPLICATION IN LARGE BOOSTER MOTOR FABRICATION.

Descriptive Note:

Summary rept., for 31 May 62-31 Jan 64,

Corporate Author:

AEROJET-GENERAL CORP SACRAMENTO CALIF

Personal Author(s):

Report Date:

1964-04-01

Pagination or Media Count:

456.0

Abstract:

The tensile, aging response, and fracture toughness properties of seven heats of 18 nickel maraging steel plate and bar stock with yield strength values ranging from 200 to 300 ksi were evaluated during a 20-month study program, and the results of this investigation were correlated with material melting and processing practices. The grain size, general microstructure, inclusion content and banding characteristics of these heats of material were determined. Relationships between yield strength, fracture toughness, and alloy composition were established. Based on the results of this program, an optimum 18 nickel maraging steel was selected for the fabrication of large-diameter booster motors and evaluated in the form of 34-in.-thick plate and 1 x 4-in. and 4 x 4-in. ring forgings. Tensile, aging response, fracture toughness, and metallurgical properties of the optimum material were evaluated. TIG and MIG welding studies were also conducted using the 34-in.-thick plate material and the weldment tensile, fracture toughness, chemical composition, and metallurgical properties were established. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE