Steels for Large Solid-propellant Rocket-motor Cases
Author: Battelle Memorial Institute. Defense Metals Information Center
Publisher:
Published: 1962
Total Pages: 46
ISBN-13:
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Evolution of Ultrahigh-strength, Hardenable Steels for Solid-propellant Rocket-motor Cases
Design Considerations in Selecting Materials for Large Solid-propellant Rocket-motor Cases
Welded Fabrication of Steel Solid-propellant Rocket-motor Cases
A Review and Comparison of Alloys for Future Solid-propellant Rocket-motor Cases
Investigation and Evaluation of High Strength Steels in Heavy Gauges for Large Diameter Solid Propellant Rocket Engine Cases
Author: EXCELCO DEVELOPMENTS INC SILVER CREEK N Y.
Publisher:
Published: 1963
Total Pages: 106
ISBN-13:
DOWNLOAD EBOOK →This research program includes the examination of candidate high strength steels (AMS 6434, D6AC, and Maraging 18% Nickel Steel) to determine the best candidate steel for use in large diameter solid propellant booster cases. Included are mechanical and physical properties, fabrication techniques, and tentative specifications and procedures for construction by the rolled and welded method of construction. Specific requirements are the examination of plate and forgings 3/8 in. to 2 in. thick to determine mechanical and physical properties of the candidate materials welded and unwelded. Further, fabrications processes examined are forming, welding, machining, drilling and tappiog, sawing burning, and heat treating. The results indicate that 250 Ksi Maraging Nickel Steel appears to be the best candidate. This is based on the basis of mechanical strength, Gc values, weldability, and the case with which this material can be aged to the strength levels required. (Author).
New Developments in Welded Fabrication of Large Solid-fuel Rocket-motor Cases
Author: Milton Dudley Randall
Publisher:
Published: 1962
Total Pages: 44
ISBN-13:
DOWNLOAD EBOOK →The predominant welding processes used in fabricating motor cases are inert-gas-shielded welding and resistance-seam welding. Three significant conclusions have been drawn relating to welded fabrication of motor cases: (1) Welding is not currently a limiting factor on the strength levels obtainable in production cases. These cases are being made of high-strength steels heat treated to strength levels between 190,000 and 210,000 uniaxial yield strength. (2) Welding could be used in motor cases in the near future at the following uniaxial-yield-strength levels: 170,000 psi - Ti alloys; 240,000- 250,000 psi low-alloy and hot-work die steels; and 280,000300,000 psi - Coldworked stainless steel or MarAging steels. (3) Welding may be used in motor cases in 2 to 4 years at the following uniaxialyield-strength levels: 200,000 psi - Titanium alloys; 260,000- 300,000 psi - Low-alloy and hotwork die steels; and 340,000 psi - Coldworked stainless steel or Mar-Aging steels. (Author).
A REVIEW AND COMPARISON OF ALLOYS FOR FUTURE SOLID-PROPELLANT ROCKET-MOTOR CASES.
Author:
Publisher:
Published: 1963
Total Pages: 44
ISBN-13:
DOWNLOAD EBOOK →Metallic materials for solid-propellant rocketmotor cases in the period 1965-1970 probably will be confined to steel and alloys of titanium and aluminum. Of the three, titanium alloys have the greatest potential on the basis of usable strength-to-density ratio, followed by steel and aluminum alloys. Of the potential steel alloys, by far the most of the current development work is being done on the 18 per cent nickel maraging steels. These steels have the promise of good fracture toughness at high strength levels, and perhaps most important, their heat treatment is favorable for the fabrication of very large boosters, compared to steels that must be austenitized after forming. Of steels that must be austenitized, quenched, and tempered, the modified silico-manganese steels, S5 tool steels, and AISI 9250 spring steel have outstanding potential. Titanium alloys continue to be relatively expensive, but they still have the greatest strengthto-density potential, and, in addition, possess outstanding resistance to corrosion. Development of new titanium alloys is being pursued with the possibility of better titanium alloys being developed. Even though aluminum alloys are not now used in rocket-motor case fabrication, newer alloys are being developed and tested, and may be feasible for such applications in the future.
Joining of Nickel-base Alloys
The Metallurgy, Behavior, and Application of the 18-percent Nickel Maraging Steels A Survey
Author: A. M. Hall
Publisher:
Published: 1968
Total Pages: 148
ISBN-13:
DOWNLOAD EBOOK →This report resulted from a survey of users and manufacturers of maraging steels, Government agencies, research institutions, and published literature. It presents the technical status of the 18-percent nickel maraging steels in detail and brings together a large body of knowledge with regard to the metallurgical and engineering aspects of maraging steels. Since such steels were first announced in 1959, they have become highly important in aerospace, defense, and industrial work. The requirements of the National Aeronautics and Space Administration have given impetus to their development, and research now underway is expected to result in further improvements and applicability. The NASA Office of Technology Utilization sponsored this report as part of its program to disseminate information on technological developments which appear to be useful for general industrial applications.
