By F. R. Schwartzberg, T. F. Kiefer, R. D. Keys (auth.), K. D. Timmerhaus (eds.)
Support from the nationwide technological know-how beginning has made it attainable for the 10th annual Cryogenic Engineering convention, hosted by way of the collage of Pennsylvania and capably directed by means of ok. R. Atkins and his employees, to stress the main overseas advances in cryogenic engineering. This particular emphasis ended in a last application of over 100 papers and has made it essential to post the lawsuits of the convention in volumes. the 1st quantity may be comparable in nature to past volumes during this sequence, whereas the second one quantity will characteristic the overseas element of the convention software. The latter quantity, due to this contrast, should be entitled overseas Advances in Cryogenic Engineering. As some time past, the Cryogenic Engineering convention Committee gratefully acknow ledges the help of the entire committed employees within the cryogenic box who've contributed their time in reviewing the initial papers for this system and the ultimate manuscripts for this quantity. because the record of individuals during this thankless job numbers good over 100, any try and recognize their person contributions within the restricted area to be had will be virtually impossible.
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Additional info for Advances in Cryogenic Engineering: Proceedings of the 1964 Cryogenic Engineering Conference (Sections A-L)
0- • .. SOOX -T6 " -. -. 3 " I ' . ~ .... ,.. " .. , so OX -T4 Fig. 5. Microstructures of sand castings 64-1 and 64-3 (Keller's etch). and grain boundaries. Dislocations that were apparent in some of the grains were attributed to internal stresses introduced during tensile loading. The microstructures of sand castings 64-1 and 64-3 are shown in Fig, 5. Segregation of micro constituents could probably be minimized by improving foundry methods and procedures. Gas porosity and micro shrinkage was generally excessive.
Liquid-hydrogen bubble chamber at the Lawrence Radiation Laboratory in Berkeley. 08 %. This material had improved magnetic stability; however, the elimination of ferrite from the structure produced an alloy that was sensitive to hot cracking and thus had poor weldability. Indeed, at the time of this study, it was learned that there had been crack formation and propagation in this alloy when attempts were made to weld the casting . In an effort to find a magnetically stable composition that was weldable, five alloys were selected for test and evaluation in a program designed specifically to evaluate their 28 C.
34 C. L. Goodzeit alternately on top and bottom until the fillet is filled to the top. Each layer is allowed to cool approximately to room temperature before the next is deposited. The welded assembly is then sectioned at least 2 in. from the end. The cut section is polished and etched and examined for cracks in both the weld metal and base metal. 05 in. These weldability tests have provided a good method of comparing the welding characteristics of the five materials that were selected for this testing program.