Structural Uses for Ductile Ordered Alloys (1984) / Chapter Skim
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'PROCESSING OF DUCTILE ORDERED ALLOYS'
'PROCESSING OF DUCTILE ORDERED ALLOYS'
Pages 87-101
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From page 87... ...
CURRENT PRODUCTION METHODS The literature on the various production processes employed for the preparation of ordered alloys for alloy development and characterization studies was surveyed. This review revealed that: 1.
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From page 88... ...
Starting with the initial melting operation, the three generic types include casting, deformation processing, and powder metallurgy.
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From page 89... ...
. The rolling operations resulted in sheet or plate of varying thickness, the hot extrusion operations generally resulted in cylindrical bar stock, and the upset forging operations resulted in pancake type configurations.
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From page 90... ...
They were not conducted as part of a systematic program to select optimum process routings that achieve maximum material yield or optimum mechanical properties. The various process variables, including cladding material, reduction ratio (for extrusion)
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From page 91... ...
Vacuum hot pressing can be used to form a net shape or near net shape, but hot extrusion must be followed by subsequent fabrication to form a useful component. Again, no systematic investigations of the hot pressing or hot extrusion operations have been conducted to optimize process economics or mechanical property performance.
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From page 92... ...
1982) , offers significant advantages compared to vacuum arc remelting including a decrease in energy consumption for comparable melt rates and significantly finer and more uniform grain sizes to enhance subsequent deformation processing.
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From page 93... ...
This is related in part to the significantly slower cooling rates obtainable in large section sizes that have an adverse effect on the morphology of the various strengthening phases in the microstructure. Increasing the cooling rate from the heat treatment temperature by the use of various quenching media (hot salt, for example)
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From page 94... ...
The vacuum hot pressing and hot extrusion consolidation approaches for the ordered alloys involve scale-up considerations similar to those discussed previously for deformation processing (i.e., process economics, capital equipment needs, and mechanical property requirements)
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From page 95... ...
In more general terms, the incorporation of joining fabrication operations in the overall processing sequence for ordered alloys also will have to address section size effects on joint quality and mechanical property response as well as the effects of phase transformations in those systems featuring multiphase microstructures. Until such studies have been conducted, no realistic assessment can be made as to whether the ordered alloys as a class of materials would present any more difficulties than do the currently used materials.
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From page 96... ...
1:207-18. Van der Wegen, G
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From page 97... ...
CHARLES S KORTOVICH joined TRW in 1964 and has been closely involved with research in the area of high temperature superalloys, including isothermal forging dies, computerization studies in investment castings, trace element effects, hot isostatic pressing of castings, and the development of superalloys through PM techniques for blade/vane and disk applications.
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From page 98... ...
At General Electric Company he conducted analytical and experimental studies in low cycle fatigue, bucket creep, and life prediction methods. He has held a series of managerial positions responsible for providing advanced analytical methods in various aspects of structural and vibration analysis.
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From page 99... ...
He is a member of and has been active on various technical committees of the American Institute of Mining, Metallurgical, and Petroleum Engineers, the American Society for Metals, and the American Society for Testing and Materials. He is co-author and co-editor of a monograph and a conference proceedings dealing with ordered alloys and is author or co-author of over 100 technical papers.
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