Heat affected zone liquation cracking evaluation on FeMnAl alloys

Giorjao, Rafael; Riffel, Kaue C.; Brizes, Eric; Sebeck, Katherine; Ramirez, Antonio J.

doi:10.1080/14686996.2024.2342232

Heat affected zone liquation cracking evaluation on FeMnAl alloys

Journal Article · Fri Aug 02 00:00:00 EDT 2024 · Science and Technology of Advanced Materials

DOI:https://doi.org/10.1080/14686996.2024.2342232· OSTI ID:2470396

Giorjao, Rafael ^[1]; Riffel, Kaue C. ^[1]; Brizes, Eric ^[2]; Sebeck, Katherine ^[3]; Ramirez, Antonio J. ^[1]

The Ohio State University, Columbus, OH (United States)
NASA Glenn Research Center, Cleveland, OH (United States)
US Army Combat Capabilities Development Command Ground Vehicle Systems Center, Warren, MI (United States)

FeMnAl steels are currently generating a lot of interest with potential applications for structural parts in armored vehicles due to their lower density and outstanding mechanical properties. Despite the extensive mechanical performance and heat treatment exploration of this alloy class, further weldability investigation is required for future large-scale deployment. In the present study, the liquation cracking of four heats of cast FeMnAl alloys was investigated by the spot-Varestraint technique. The study focuses primarily on the effect of the major elements of the FeMnAl system: C, Mn and Al. Optical and electron microscopy were employed to investigate the microstructural features, and CALPHAD was employed to aid the discussion regarding the alloy’s composition differences and their effect on the liquation cracking susceptibility. The study was able to identify that compositions with the higher Mn, C, and lower Al presented the highest liquation cracking susceptibility. Conversely, composition presenting lower Mn, C, and Al showed the most resistant behavior. Furthermore, lower Al content promoted a fully-γ microstructure at low temperatures, which encouraged the appearance of longer cracks as a γ-matrix is more susceptible to HAZ cracking than a fully ferritic (α) or duplex (α + γ) microstructure.

View Accepted Manuscript (DOE)

Research Organization:: The Ohio State University, Columbus, OH (United States)

Sponsoring Organization:: USDOE

OSTI ID:: 2470396

Journal Information:: Science and Technology of Advanced Materials, Journal Name: Science and Technology of Advanced Materials Journal Issue: 1 Vol. 25; ISSN 1468-6996

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
CALPHAD
FeMnAl steels
Materials Science
Spot varestraint testing
liquation cracking

Heat affected zone liquation cracking evaluation on FeMnAl alloys

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References (18)

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