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Author: R. L. Jones
Publisher:
ISBN:
Category :
Languages : en
Pages : 155
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Book Description
This report presents the results of an investigation of the mechanical properties of high strength steel aircraft forgings. Republic Steel Corporation's 9Ni-4Co and 18 NiCoMo(300) were examined in detail for smooth and notched tensile and fatigue strength, stress corrosion resistance and fracture toughness properties. To a lesser extent forged SAE 4340 and H-11 steels were evaluated for comparison. The forgings evaluated were two configurations, a 235-lb. M.L.G. shock strut cylinder and a 275-lb. M.L.G. axle beam forging. The effects of grain flow, forging temperature, and heat treatment were examined. Variations from heat to heat and forging lot to forging lot were analyzed. In general, the 18 NiCoMo(300) steel was capable of attaining the highest tensile strength, particularly yield strength. However, this higher strength did not manifest itself under fatigue loading conditions. As a result, the 9Ni-4Co steel had higher notched and smooth axial fatigue strength. From a stress corrosion standpoint the 9Ni-4Co steel was superior to 18 NiCoMo where no stress raiser was present. The reverse was true for the partial cracked test specimens. In both cases 4340 had extremely low stress corrosion strength. (Author).
Author: R. L. Jones
Publisher:
ISBN:
Category :
Languages : en
Pages : 155
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Book Description
This report presents the results of an investigation of the mechanical properties of high strength steel aircraft forgings. Republic Steel Corporation's 9Ni-4Co and 18 NiCoMo(300) were examined in detail for smooth and notched tensile and fatigue strength, stress corrosion resistance and fracture toughness properties. To a lesser extent forged SAE 4340 and H-11 steels were evaluated for comparison. The forgings evaluated were two configurations, a 235-lb. M.L.G. shock strut cylinder and a 275-lb. M.L.G. axle beam forging. The effects of grain flow, forging temperature, and heat treatment were examined. Variations from heat to heat and forging lot to forging lot were analyzed. In general, the 18 NiCoMo(300) steel was capable of attaining the highest tensile strength, particularly yield strength. However, this higher strength did not manifest itself under fatigue loading conditions. As a result, the 9Ni-4Co steel had higher notched and smooth axial fatigue strength. From a stress corrosion standpoint the 9Ni-4Co steel was superior to 18 NiCoMo where no stress raiser was present. The reverse was true for the partial cracked test specimens. In both cases 4340 had extremely low stress corrosion strength. (Author).
Author: H. J. Henning
Publisher:
ISBN:
Category : Blacksmithing
Languages : en
Pages : 68
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Book Description
THIS REPORT IS MAINLY CONCERNED WITH FORGINGS MADE FROM MARTENSITIC STEELS HEAT TREATED TO STRENGTHS RANGING FROM 240,000 TO 300,000 PSI. FORGING CHARACTERISTICS, DESIGN LIMITATIONS, DIMENSIONAL TOLERANCES, AND QUALITY-CONTROL PROBLEMS ARE DISCUSSED. A CONSIDERABLE AMOUNT OF DATA ON MECHANICAL PROPERTIES IS ALSO PRESENTED. IN ADDITION, THE REPORT SUMMARIZES THE AVAILABLE INFORMATION ON FORGED, SEMIAUSTENITIAL STEELS. THIS COMPILATION IS BASED ON PUBLISHED ARTICLES, GOVERNMENT REPORTS, AND INTERVIEWS WITH PRODUCERS AND USERS OF STEEL FORGINGS.
Author: F. A. MATTER
Publisher:
ISBN:
Category :
Languages : en
Pages : 1
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Book Description
Author: T. P. Groeneveld
Publisher:
ISBN:
Category : Steel, High strength
Languages : en
Pages : 22
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Book Description
This memorandum briefly discusses the physical metallurgy, heat treatment, mechanical properties, stress-corrosion properties, and fabrication of the 9Ni-4Co-XC steels. This family of steels was developed specifically to meet the requirements of the aircraft and aerospace industries for materials possessing high strength and high toughness. By varying the composition and heat treatment, the 9Ni-4Co-xC steels can develop strengths in the 200 to 300 ksi tensile-strength range and reportedly possess high toughness. The lower carbon grades have excellent weldability, developing strength in the 180 to 200 ksi range with high toughness without the need for preheat or postweld-heat treatment. (Author).
Author: J. E. Campbell
Publisher:
ISBN:
Category : Steel, High strength
Languages : en
Pages : 22
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Book Description
The Memorandum discusses the current situation on the inclusion of fracture-toughness testing requirements in specifications for high-strength steels used for military applications. The Memorandum was prepared at the request of The Technical Cooperation Program (TTCP), and contains information from Canadian and British members of that program, as well as U.S. information. Military applications discussed include missile motor cases, aircraft landing gear, gun tubes, armor plate, and hydrofoils. (Author).
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1126
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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: Benjamin Floyd Brown
Publisher:
ISBN:
Category : Aluminum alloys
Languages : en
Pages : 390
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Book Description
Author: Edward G. Nisbett
Publisher: ASTM International
ISBN: 0803104650
Category : Metals
Languages : en
Pages : 606
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Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 228
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Author: F. J. JR. RAGLAND
Publisher:
ISBN:
Category :
Languages : en
Pages : 1
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Book Description
