Showing papers on "Metal matrix composite published in 1979"
TL;DR: In this article, the development of the C-scan method for non-destructively inspecting graphite/aluminum metal matrix composites is discussed and specific test results are shown and mechanical properties are correlated with anomalous regions which were detected by the C scan technique.
Abstract: Development of the C-scan method for nondestructively inspecting graphite/aluminum metal matrix composites is discussed. Specific test results are shown and mechanical properties are correlated with anomalous regions which were detected by the C-scan technique.
1 citations
05 Jul 1979
TL;DR: In this paper, the effects of isothermally transformed pearlite, bainite, and cementite on the strength, ductility, and plane-strain fracture toughness of a hypereutectoid silico-manganese steel was examined.
Abstract: : Attempts to control the dynamic compression failure modes of tungsten fiber reinforced steel matrices included changing the matrix material from mild steel to a hypereutectoid steel. However, the thermo-mechanical processes used to fabricate such metal matrix composite materials produce mixed microstructures, and it was not known to what extent the nonmartensitic transformation products influence mechanical behavior. This work examines the effects of isothermally transformed pearlite, bainite, and cementite on the strength, ductility, and plane-strain fracture toughness of a hypereutectoid silico-manganese steel that typifies the compositions being evaluated for a class of metal matrix composite systems. The small-grained, quenched-and-tempered martensite was the toughest material (60 MPa sq. root of m). Increasing the pearlite content gradually decreased the fracture toughness. However, increasing the banite content by even slight amounts produced a catastrophic decrease in fracture toughness to half that value, which was found to be nearly the minimum KIC determined from low temperature (-54C) tests, i.e., 28 MPA sq. root of m. This result dramatizes the importance of careful heat treatment when using such materials in engineering structures. (Author)
1 citations