Abstract
It is of considerable technological importance to establish how far textures introduced into controlled‐rolled steels by finish rolling at low temperatures may affect the fracture strength. The purely textural effect is difficult to isolate in such steels because of anisotropy associated with grain shape, inclusions and pearlite banding. Consequently, an investigation was carried out using molybdenum, a b.c.c. single phase material showing good structural homogeneity, as a model. Texture development was studied using crystallite orientation distribution function analysis to identify a suitable processing route leading to a sharp texture with a suitable distribution of {100} cleavage planes. The behaviour of a sharply textured specimen was analysed by taking fracture specimens from various orientations in the plate. The energy absorbed in impact showed a positive correlation with the density of 100 planes in the crack direction, but the extent of the variation was less than would have been expected had crack propagation been the controlling step in the fracture process.
Highlights
INTRODUCTIONWork with molybdenum (Ransley and Rooksby, 1938; Semchysen and Timmons, 1952) showed that the development of a strong
Work with molybdenum (Ransley and Rooksby, 1938; Semchysen and Timmons, 1952) showed that the development of a strong{100}(011) texture leads to a reduction in the fracture strength of specimens tested with their axes at 45 to the rolling direction
It is clear that it is of considerable commercial importance to establish whether or not the textures introduced into ferrite by finishing controlled-rolled steels at temperatures below the ),phase boundary could contribute to low fracture strength
Summary
Work with molybdenum (Ransley and Rooksby, 1938; Semchysen and Timmons, 1952) showed that the development of a strong. Recent work (Mintz et al, 1976; Mintz et al, 1979) with controlled-rolled steels in which impact fracture results were correlated with texture, using crystallite orientation distribution function (c.o.d.f.) procedures, showed some correlations for through-thickness tests but not for in-plate tests In this case, matters were complicated by microstructural anisotropy associated with pearlite banding and inclusions. It is clear that it is of considerable commercial importance to establish whether or not the textures introduced into ferrite by finishing controlled-rolled steels at temperatures below the ),-phase boundary could contribute to low fracture strength To do this it is necessary to isolate, as far as possible, textural effects from microstructural effects. To carry out a study of texture development in molybdenum in order to identify a processing route which would give a distribution of { 100} cleavage planes which could be effectively utilised
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