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- W2298817840 abstract "The results of detailed metallographic observations (including measurements of twin frequency) on Armco iron samples deformed in tension under various experimental conditions are presented and discussed. For fine-grained specimens, it was found that twinning can occur and be unconnected with brittie fracture. Twin formation is a secondary mode of deformation, and occurs virtually at the front of a propagating Luders band. Twinning takes place preferentially in the largest grains in a typical cross-section, and the percentage twinning increases with increase in yield stress (with decrease in temperature or increase in strain rate). The twinning in fine-grained samples is explained in terms of a simple yield propagation model. For coarse-grained specimens, the twinning behavior may be explained similarly, but there is the added complication of brittle fracture intervenlng in the deformation process. Etch-pit studies showed that there is a stress concentration associated with the tip of a twin and that it may be relieved by slip or twinning in the neighborhood of the point of contact when the tip strikes a grain boundary or another twin. Evidence is also given in support of the emissary dislocation concept. It was concluded that twinnlng precedes brittle fracture, but it is not certain thatmore » twins are the cause of brittle fracture except in samples tested below the ductile-brittle transition temperature. The deformation behavior of Armco iron with panticular reference to twinning is tabulated. (auth)« less" @default.
- W2298817840 created "2016-06-24" @default.
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- W2298817840 date "1963-11-01" @default.
- W2298817840 modified "2023-09-23" @default.
- W2298817840 title "THE EFFECT OF RADIATION ON THE DUCTILE-BRITTLE TRANSITION IN PRESSURE VESSEL STEELS. Special Report No. 2 ON THE POSSIBLE RELATIONSHIP BETWEEN TWINNING AND BRITTLE FRACTURE IN IRON AND OTHER BODY-CENTERED CUBIC METALS. PART TWO--EXPERIMENTAL INVESTIGATION" @default.
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