Evaluation Of High Nickel Steel For Application In Large Booster Motor Fabrication
Report Number: ML TDR 64-115
Author(s): Anderson, R. E., Crimmins, P. P.
Corporate Author(s): Aerojet-General Corp Sacramento Calif
Laboratory: Air Force Materials Laboratory
Date of Publication: 1964-04
Pages: 386
DoD Task:
Identifier: AD0605862
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. In addition to the basic physical material properties that were studied, metallurgical properties also were studied to determine the grain size, general microstructure, inclusion content and banding characteristics of these heats of these material. Relationships between yield strength, fracture toughness, and alloy composition were established. Fracture toughness correlation studies were conducted using the part-through-crack tensile, center-notch tensile, precrack-Charpy and low-notch-bend test specimens.TIG, MIG, and submerged-arc welding processes were evaluated using 200- and 250-ksi yield-strength base metals. Weldment tensile, fracture toughness, chemical composition, and metallurgical properties were evaluated and relationships between these properties 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 3/4-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 3/4-in.-thick plate material and the weldment tensile, fracture toughness, chemical composition, and metallurgical properties were established.Finally, this study program culminated in the preparation of plate, forging, and filler wire specifications for use in the fabrication of large-diameter solid-rocket motor chambers. These specificaions are presented herein.
Provenance: Lockheed Martin Missiles & Fire Control
Author(s): Anderson, R. E., Crimmins, P. P.
Corporate Author(s): Aerojet-General Corp Sacramento Calif
Laboratory: Air Force Materials Laboratory
Date of Publication: 1964-04
Pages: 386
DoD Task:
Identifier: AD0605862
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. In addition to the basic physical material properties that were studied, metallurgical properties also were studied to determine the grain size, general microstructure, inclusion content and banding characteristics of these heats of these material. Relationships between yield strength, fracture toughness, and alloy composition were established. Fracture toughness correlation studies were conducted using the part-through-crack tensile, center-notch tensile, precrack-Charpy and low-notch-bend test specimens.TIG, MIG, and submerged-arc welding processes were evaluated using 200- and 250-ksi yield-strength base metals. Weldment tensile, fracture toughness, chemical composition, and metallurgical properties were evaluated and relationships between these properties 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 3/4-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 3/4-in.-thick plate material and the weldment tensile, fracture toughness, chemical composition, and metallurgical properties were established.Finally, this study program culminated in the preparation of plate, forging, and filler wire specifications for use in the fabrication of large-diameter solid-rocket motor chambers. These specificaions are presented herein.
Provenance: Lockheed Martin Missiles & Fire Control