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Transgranular Cracking in a Liquid Zn Embrittled High Strength Steel
Diptak Bhattacharya1, Lawrence Cho2, Ellen Van der Aa3
1Department of Metallurgy and Materials Engineering, Advanced Steel Processing and Product Research Center, Colorado School of Mines, 1500 Illinois Street, Golden, CO 80401, USA.
None:
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 in ferrite.
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