"Rolling mills." . . "Hardness." . . "Materials." . . . . "Rocket engines." . . "Metal plates." . . "Rocket engine cases." . . "Mechanical properties." . . . . . . . . . "EVALUATION OF HIGH-NICKEL STEEL FOR APPLICATION IN LARGE BOOSTER MOTOR FABRICATION"@en . . . . . . . . . . . . . . . . . "The results of investigations conducted to deter mine the mechanical and metallurgical properties and weldability of the 18%-nickel maraging alloy steels. The information in this report relates specifically to the results of studies conducted to: (1) establish the mechanical and metallurg ical properties, including fracture toughness, of parent-metal 18%-nickel alloy steels processed by different melting techniques; (2) determine the effect of varying weld-wire compositions on the mechanical and metallurgical properties of TIG-welded 1/2-in.-thick material; (3) determine the effect of the MIG and submerged-arc process on the mechanical and metallurgical properties of welded 1/2-in.-thick material; and (4) deter mine the fracture toughness of weld deposits and heat-affected zones. The selection of an optimum material was based on the results of these studies. A supplemental program, which has increased the scope of fracture-toughness testing, was authorized. Progress made on this supplemental program is also presented."@en . . . . . "Metallurgy." . . "Hot working." . . "Solid propellant rocket engines." . . "Solid Propellant Rocket Engines." . "Booster rocket engines." . . "Sheets." . . "Steel." . . "Martensite." . . "AEROJET-GENERAL CORP SACRAMENTO CA." . . "Nickel alloys." . . "Chemical analysis." . . "Toughness." . . "Impact shock." . . "Additives." . . "Metallurgy and Metallography." . . "Melting." . . "Welding." . .