Yusuke Shimada

Crystallographic orientation analysis of cleavage facets adjacent to a fracture trigger in low carbon steel

The microstructure and crystallographic orientation under a cleavage crack trigger point, which was detected on a fracture toughness specimen of low carbon steel, were investigated. SEM fractographs of an etched cleavage facet reveal that a flat cleavage facet between facet ridges spreading from the trigger point is divided by a grain boundary between ferrite and pearlite. Even a different phase boundary does not occasionally create any steps and ridges on the cleavage facet: it suggests this phase boundary is not an obstacle to cleavage cracking. Electron diffraction analysis for the thin foil sample milled out from this phase boundary demonstrates that the crystallographic orientation of the ferrite grain is consistent with that of the ferrite in the adjacent pearlite block. It is strictly examined that the ferrite/pearlite boundary does not act as a local resistance to cleavage crack growth when the crystallographic orientation of the ferrite in the pearlite block is aligned with an adjacent ferrite grain.

Effect of specimen size, applied stress and temperature gradient on brittle crack arrest toughness test

Temperature gradient type ESSO test is one of the most popular test methods for evaluating the brittle crack arrest toughness,

Micromechanical Characterisation of Microstructure in Weld Heat Affected Zone of Structural Steel

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WES 2808 for Brittle Fracture Assessment of Steel Components Under Seismic Conditions Part II: Change in Mechanical Properties of Structural Steels by Pre-strain and Dynamic Loading

Kca. However, test conditions which are specimen shape, tab plate shape, applied stress and temperature gradient affect

WES 2808 for Brittle Fracture Assessment of Steel Components under Seismic Conditions – Part I: Fracture Assessment Procedure

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Effect of Specimen Size and Applied Stress on Brittle Crack Arrest Toughness - Study on Standard Test Method for Crack Arrest Toughness, Kca -2 -

Kca. This document reports effects of specimen geometries that are specimen width, tab plate length, tab plate thickness and tab plate width on