The influence of manufacturing process and aging treatments on the fracture characteristics of two austenitic steels at 25° and 725°C has been evaluated from energy measurements and a crack-tip displacement parameter measured concurrently in three-point bending. A major feature (particularly with the cast alloys) was the initiation over a range of crack-tip displacements of several cracks at a notch root, anyone of which propagated to failure. The paper discusses a case for measuring a maximum load or instability crack-tip displacement when multiple crack initiation takes place rather than an initiation displacement.
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References
1.
ELLIOTTD. and MAYM. J.: BISRA open report MG/C/47/69, 1969.
2.
HARRISONT. C.: Gas Council report T311, 1970.
3.
ELLIOTTD. and MayM. I.: BISRA open report MG/C/86/68, 1968.
4.
STOCKC. R.: Ph.D. thesis, Brunel University, 1971.
5.
CLAUSINGD. P.: Inter. J. Fracture Mech., 1970,6, 71.
6.
DEITERG.: Proceedings of ASM seminar on ductility, 1968,5.
7.
LEFEVREJ.: C.D.S. Circ. (3), p. 805, BISIT 8411, 1970.
8.
KLEEMOLAH. J.: JISI, 1970, 208, 1025.
9.
RELFD. E.: to be published.
10.
‘Materials technology in steam reforming processes‘, (ed. EdeleanuC.); 1966, Pergamon.
11.
SANDERSONG. P. and LLEWELLYND. T.: JISI, 1969, 207, 1129.
