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Transgranular Cracking in a Liquid Zn Embrittled High Strength Steel

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Document pages: 16 pages

Abstract: Intergranular Zn-assisted liquid metal embrittlement (LME) cracks have been frequently reported in steels, involving austenite grain boundary penetration of liquid Zn at high temperature. In the present study, a Zn-coated high strength steel was deformed at an intercritical temperature, and the characteristics of LME cracking were studied in a mixed microstructure composed of ferrite and austenite. Crack propagation was intergranular in austenite; in contrast, the ferrite exhibited both intergranular LME and "transgranular " LME. Trace analysis of the crack plane orientation was consistent with cracking along {100} cleavage planes.

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