Materials for Space-power Liquid Metals Service
Materials for Space-power Liquid Metals Service

Author: John H. Stang

Publisher:

Published: 1965

Total Pages: 14

ISBN-13:

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This memorandum deals with the use of liquid metals in advanced spacepower plants. The principal liquid-metal candidates for such applications are mercury, NaK, potassium, lithium, cesium, and sodium. These metals are used primarily as heat-transfer media and as working fluids at high temperatures. This memorandum identifies specific areas for molten metal use and discusses the materials, problems, and developments associated with their containment. (Author).

The 9Ni-4Co Steels
The 9Ni-4Co Steels

Author: T. P. Groeneveld

Publisher:

Published: 1966

Total Pages: 22

ISBN-13:

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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).

A Survey of the Feasibility of an Analytical Approach to Die Design in Closed-die Forging
A Survey of the Feasibility of an Analytical Approach to Die Design in Closed-die Forging

Author: Serope Kalpakjian

Publisher:

Published: 1966

Total Pages: 42

ISBN-13:

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The study surveys the present state of knowledge on the design of die sequences in closed-die forging with a view toward studying the feasibility of establishing an analytical procedure. The contents are comprised of (1) a review of present methods practiced in die-sequency design, (2) a review of factors involved in metal flow, and (3) examples of analytical work that might constitute the background for a more rational study of the closed-die-forging process. (Author).

Vacuum-degassed Steels from the Consumer's Viewpoint
Vacuum-degassed Steels from the Consumer's Viewpoint

Author: A. F. Hoenie

Publisher:

Published: 1966

Total Pages: 38

ISBN-13:

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Numerous industrial users were asked for their appraisal of vacuum-degassed steel. Their responses regarding the merits of this vacuum treatment were varied. The producers and users of large forgings reported fewer internal defects, improved toughness, and decreased processing time through shorter hydrogen relief treatments. Improved fatigue life in applications such as bearings was attributed to fewer and smaller nonmetallic inclusions in vacuum-degassed steel. The users of medium and small forgings reported only marginal improvement in properties and little or no change in rejection rates by nondestructive testing. Unfortunately, many of the users could not give a meaningful evaluation because they knew that frequently their suppliers filled orders with vacuum-degassed steels even though such treatment was not specified. Consequently, these users are unable to separate the air melted and the vacuum-degassed steels in their stock for comparison. A more comprehensive study of fully identified steels, steelmaking practice, degassing methods, material properties, and performance in service will be required before a satisfactory evaluation of the merits of vacuum-degassed steels can be made. (Author).

Titanium - 1966
Titanium - 1966

Author:

Publisher:

Published: 1966

Total Pages: 108

ISBN-13:

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This memorandum reproduces thirteen lectures delivered at a Titanium Symposium held on March 28-29, 1966, at Hawthorne, California, under the auspices of the Norair Division of the Northrop Corporation. These lectures follow a logical sequence of topics including production aspects, metallurgy, manufacturing technology, and the design of titanium parts for aircraft and aerospace applications. (Author).

Recent Developments in Welding Thick Titanium Plate
Recent Developments in Welding Thick Titanium Plate

Author: R. E. Monroe

Publisher:

Published: 1965

Total Pages: 26

ISBN-13:

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This memorandum represents a combined effort by the U.S. Naval Applied Science Laboratory, Brooklyn, New York, and the Defense Metals Information Center to summarize new information on welding thick Ti plate. Thick plate of Ti continues to be of interest to the aerospace and defense industries for possible use in submersibles, armored vehicles, large space boosters, high-speed aircraft, and for pressure vessels. This memorandum generally is limited to information on welding Ti plate that is (1) at least 1 in. thick and (2) that is not covered by DMIC Report 185, The Status and Properties of Titanium Alloys for Thick Plate, June 14, 1963. The general requirements for welding Ti are not repeated here, since they are well documented in references mentioned in the inroduction to the memorandum. Sections have been prepared to cover material developments, welding-process developments, weld properties, and residual welding stresses. (Author).