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| CRYSTALLOGRAPHIC ANALYSIS OF THE FRACTURE FACETS IN LOW TEMPERATURE BRITTLE FRACTURE OF A HIGH NITROGEN BEARING AUSTENITIC STEEL |
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| 大连交通大学 |
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Cite this article:
;. CRYSTALLOGRAPHIC ANALYSIS OF THE FRACTURE FACETS IN LOW TEMPERATURE BRITTLE FRACTURE OF A HIGH NITROGEN BEARING AUSTENITIC STEEL. Acta Metall Sin, 2007, 43(12): 1233-1238 .
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Abstract Microstructures and crystallographic features in low temperature brittle fracture of 18Cr-18Mn-0.7N high nitrogen bearing austenitic steel were investigated by means of scanning electronic microscopy. The results showed that there are three kinds of fracture facets on the fracture surface: annealing twin boundary fracture facet, intergranular fracture facet and transgranular fracture facet. Annealing twin boundary facture facet is one of planar and smooth {111} planes, with bent steps on it, and the planar deformations proceeding on the other three sets of {111} planes form a pattern of three sets of straight-lines intersected at 60º on the annealing twin boundary facet. Intergranular facture facet is a kind of smoothly curved facet on which the planar deformations proceeding on {111} planes form a pattern of several sets of curved parallel lines that intersect each other at different angles. Transgranular facture facet is rough and uneven, with steps parallel to {111} plane and river patterns or edge patterns on it, which is the consequence of coalescence of cracks propagating on different {111} planes.
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Received: 01 February 2007
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