Journal ArticleDOI
Fracture of steels containing pearlite
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In this article, the relative effects of pearlite and spherodite on ductile, cleavage, and fatigue failure are summarized, and it is shown that neither the cleavage strength nor the fatigue endurance limit appear to depend directly on cementite content per se.Abstract:
The relative effects of pearlite and spherodite on ductile, cleavage, and fatigue failure are summarized. Neither the cleavage strength nor the fatigue endurance limit appear to depend directly on cementite contentper se. Spherodized steels cleave less readily than ferrite/pearlite steels. Ductile fracture resistance is lowered considerably by both types of cementite, pearlite being more deleterious. Ferrite/pearlite steels appear to exhibit slower fatigue crack growth rates at low stress intensity levels than high strength steels. At high stress intensity levels the behavior is reversed. Slip-incuded cracking of carbide lamellae appears easier than that of spherodized carbides. In ductile fracture situations the crack spreads progressively through a pearlite colony via preferential cracking of carbides and rupture of the intervening ferrite accompanied by large local shear strains. Fatigue fracture proceeds with formation of frequent branches, preferentially along the pearlite colony interface.read more
Citations
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Journal ArticleDOI
The role of microstructure on the strength and toughness of fully pearlitic steels
J. M. Hyzak,I. M. Bernstein +1 more
TL;DR: In this article, an experimental program was carried out to clarify the structure-property relationships in fully-pearlitic steels of moderately high strength levels and to identify the critical microstructural features that control the deformation and fracture processes.
Journal ArticleDOI
Dynamic studies of the tensile deformation and fracture of pearlite
TL;DR: In this article, a model is proposed to account for the differences in behaviour between coarse and fine pearlites, based upon a combination of pile-up and fibre loading stresses, in which the operating deformation mode is largely determined by which type of mechanism is dominant.
Journal Article
Dynamic studies of the tensile deformation and fracture of pearlite using high-resolution 200-KV sem
D.A. Porter,K.E. Easterling +1 more
TL;DR: In this article, the tensile deformation and fracture of pearlite were studied using high-resolution 200-kV semi-volumetric sensors and a high-frequency 200-KV semiuser.
Journal ArticleDOI
The process of crack initiation and effective grain size for cleavage fracture in pearlitic eutectoid steel
Y. J. Park,I. M. Bernstein +1 more
TL;DR: In this article, the process of cleavage crack initiation and the character of the effective grain size which controls the fracture toughness of pearlitic eutectoid steel has been investigated using smooth tensile and precracked Charpy impact specimens.
Journal ArticleDOI
On the influence of microstructure on crack propagation mechanisms and fracture toughness of metallic materials
TL;DR: In this article, a survey on the effect of microstructure on crack propagation mechanisms and fracture toughness is given, where the influence of inclusions and of the material's matrix are treated separately.
References
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Journal ArticleDOI
Work hardening of dispersion-hardened crystals
TL;DR: In this article, a new theory of work hardening in dispersion-hardened single crystals is described, which is based on the fact that, if the particles do not deform plastically, and the interface between particle and matrix does not fracture, then secondary slip must occur locally round each particle when the crystal is deformed, even though the crystal may appear to deform by single slip.
Journal ArticleDOI
Cavity formation at the interface of a spherical inclusion in a plastically deformed matrix
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Journal ArticleDOI
The critical tensile stress criterion for cleavage
TL;DR: In this paper, an elastic-plastic analysis was used to accurately measure the microscopic cleavage strength of notched bars of high nitrogen steel in bending, and it was found that the cleavage fracture strength increases as the root radius of the notch decreases.
Journal ArticleDOI
The effect of dynamic strain-ageing on the ductile fracture process in mild steel
TL;DR: In this paper, the effect of dynamic strain-ageing on the initiation and propagation of ductile fracture in mild steel was examined using scanning electron microscopy and it was shown that this crack density increases with strain.
Journal ArticleDOI
The variation of K Ic with temperature and loading rate
TL;DR: In this article, a relation, KIcY2 = (Σ*/2.35)3, where kIc is plane strain fracture toughness, Y is the local value of yield stress in the crack-tip plastic zone, and Σ* is the cleavage stress of an unnotched bulk specimen, is shown to be a reasonable approximation to the data from a large number of investigations.
Related Papers (5)
The role of microstructure on the strength and toughness of fully pearlitic steels
J. M. Hyzak,I. M. Bernstein +1 more
The process of crack initiation and effective grain size for cleavage fracture in pearlitic eutectoid steel
Y. J. Park,I. M. Bernstein +1 more