By R. P. Reed, A. F. Clark, E. C. van Reuth (auth.), K. D. Timmerhaus, R. P. Reed, A. F. Clark (eds.)
The First overseas Cryogenic fabrics convention (ICMC) supplied a brand new discussion board for the presentation of low-temperature fabrics study. The confer ence, held along side the 1975 Cryogenic Engineering convention, supplied fabrics study body of workers with first-class publicity to present advance ments within the cryogenics box and helpful interactions with designers of cryogenic structures. as a result huge reaction to a overdue demand papers, the passion and encouragement on the assembly, and the vast spectrum and top of the range of papers, the second one overseas Cryogenic fabrics convention is being deliberate in addition to the 1977 Cryogenic Engineering convention for Boulder, Colorado, in the summertime of 1977. The luck of the 1st overseas Cryogenic fabrics convention was once definitely in huge degree a result of first-class hospitality of our Canadian hosts, the Royal army university of Canada and Queen's collage in Kingston, Ontario. specifically, the efforts of A. C. Leonard and his employees ensured a superb convention and a delightful and noteworthy stopover at to Canada. The Cryogenic Engineering convention Board used to be either beneficiant and skillful in aiding to begin this new convention and their assistance and reputation is gratefully stated. The Cryogenic Engineering convention software chairman, M. J. Hiza, tremendously facilitated the interplay for the 2 meetings and supplied priceless suggestions in generat ing a viable software. The court cases of the 1975 Cryogenic Engineering convention are released as quantity 21 of the Advances in Cryogenic Engineering and contain many papers indicating cutting edge use of recent cryogenic fabrics homes data.
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Additional resources for Advances in Cryogenic Engineering: Volume 22
J. G. Kaufman, F. G. Nelson, and R. H. Wygonic, in: Fatigue and Fracture Toughness-Cryogenic Behavior, ASTM STP 556 (1974), p. 125. 46. L. R. Hall and R. W. Finger, "Investigation of Flaw Geometry and Loading Effects on Plane-Strain Fracture in Metallic Structures," NASA CR-72659 (1971). 47. F. G. Nelson and J. G. Kaufman, in: Fracture Toughness Testing at Cryogenic Temperatures, ASTM STP 496 (1971), p. 27. 48. F. R. Schwartzberg, R. D. Keys, and T. F. Kiefer, "Cryogenic Alloy Screening," NASA CR-72733 (1970).
The data for this alloy represent crack propagation through stable austenite. A comparison shows that the rates for AISI 310 are similar to those shown in Fig. 3 for ASTM A637 and A453 alloys, two stable austenitic superalloys. These findings suggest that 42 R. L. Tobler and R. P. Reed the martensitic transformation may have influenced the results for the metastable stainless steels, causing higher growth rates than observed for stable austenites. The tests of a quenched and tempered 9% nickel steel (ASTM A553) revealed exceptionally high crack growth rates at 4 K, as shown in Fig.
The calculation is made on the basis of the average Kc measured in the static fracture toughness tests for the appropriate thickness plates. Both unwelded plates and weldments are considered; in the weldments, the heat-affected zone is considered the limiting region. The results of this calculation show that at -170°C stresses exceeding the ambient temperature yield strength are required before unstable crack propagation is expected in any of these 25-mm plates. The stresses are about 90% of the yield strength of the steels at the test temperature as well.
Advances in Cryogenic Engineering: Volume 22 by R. P. Reed, A. F. Clark, E. C. van Reuth (auth.), K. D. Timmerhaus, R. P. Reed, A. F. Clark (eds.)