It's been reported the occurrence of hydrogen induced inter-granular or transgranular
quasi-cleavage fracture largely depends on tramp element (P, Sb, Sn, As) segregation to grain boundaries and the subsequent loss of grain boundary cohesive strength.
Figure 14b indicates that the fractured surface has predominantly transgranular
fracture with mainly cleavage facets.
Plastic deformation because of slip, the process by which a dislocation moves in response to shear stresses, contributes to ductile fracture through crack propagation across the grain boundaries (transgranular
).19 The fracture surface subsequent to this mechanism is commonly categorized by a dimpled configuration.
However, a lot of slag inclusions and transgranular
cracks are produced at the same time, which may lead to the decline of mechanical properties.
Kainer, "Evaluation of the delayed hydride cracking mechanism for transgranular
stress corrosion cracking of magnesium alloys," Materials Science and Engineering: A, vol.
Secondary FIs occurring in microfractures and transgranular
trails are not measured in this study.
Note the clear transgranular
cleavage pattern with facet and flowery cleavages in Figure 4(c) at higher magnification.
crack growth in the pipeline steels exposed to near-neutral pH soil aqueous solutions: The role of hydrogen," Acta Materialia, vol.
Figure 14 shows grain boundary facets with cracks originating at grain boundary junctions alongside transgranular
fatigue cracks, indicating build-up of time-dependent creep damage.
The weaker crystal particles will be broken to produce a transgranular
failure with a lumpy surface.
fracture is the predominant micro-cracking mode due to the existence of large graphite flakes (Figure 4(a)).
Typical example of the APC-SCC is the chloride SCC of austenitic stainless steel and transgranular
(TG) type cracking.