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Generating Lap Joints Via Friction Stir Spot Welding on DP780 Steel

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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.

Scripta Materialia

|March 14, 2020

Summary

Liquid metal embrittlement (LME) in steel involves zinc penetration at grain boundaries. This study reveals zinc-assisted LME cracks propagate intergranularly in austenite and both intergranularly and transgranularly in ferrite.

Keywords:

Liquid metal embrittlement Zn ferrite high strength steel intercritical temperature transgranular cracking

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Area of Science:

Materials Science
Metallurgy
Fracture Mechanics

Background:

Intergranular zinc-assisted liquid metal embrittlement (LME) is a known failure mechanism in steels.
This phenomenon involves the penetration of liquid zinc along austenite grain boundaries at elevated temperatures.

Purpose of the Study:

To investigate the characteristics of LME cracking in a mixed ferrite-austenite microstructure.
To analyze crack propagation behavior in high-strength steel coated with zinc and deformed at intercritical temperatures.

Main Methods:

Deformation of zinc-coated high-strength steel at an intercritical temperature.
Microstructural analysis of crack propagation.
Trace analysis of crack plane orientation.

Main Results:

Crack propagation was observed to be intergranular within the austenite phase.
Ferrite phase exhibited both intergranular and transgranular LME.
Crack plane orientation analysis in ferrite indicated cracking along {100} cleavage planes.

Conclusions:

The study elucidates distinct LME cracking behaviors in ferrite and austenite phases of steel.
Findings highlight the role of microstructure in governing LME susceptibility and crack morphology.