Design, properties, and weldability of advanced oxidation-resistant FeCrAl alloys

Gussev, M. N.; Field, K. G.; Yamamoto, Y.

doi:10.1016/j.matdes.2017.05.009

Title: Design, properties, and weldability of advanced oxidation-resistant FeCrAl alloys

Journal Article · Fri May 05 00:00:00 EDT 2017 · Materials & Design

DOI:https://doi.org/10.1016/j.matdes.2017.05.009· OSTI ID:1361343

Gussev, M. N. ^[1]; Field, K. G. ^[1]; Yamamoto, Y. ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

FeCrAl alloys are promising as corrosion- and oxidation-resistance materials for extreme high-temperature applications. However, further alloy design and improvement requires a delicate balance between workability, weldability, propensity for '-phase formation, among other factors. Here, a series of advanced oxidant resistant FeCrAl alloys were produced and investigated. Variants with Al (+2%), Nb (+1%), and TiC (0.1, 0.3, and 1%) additions over the reference alloy (Fe-13%Cr-5%Al) were characterized in detail before and after controlled laser beam welding using tensile tests with digital image correlation, SEM-EBSD analysis, and fractography. All investigated alloys demonstrated yield stress in the weldment over 500 MPa; no welding-induced cracking was observed. However, it was shown that the increase in the Al-content over 5% was detrimental leading to a brittle fracture mechanism and decreased ductility in the weldment. At the same time, Nb and TiC additions were beneficial for preventing grain growth and reducing local softening (yield stress reduction) in the heat-affected zone. The 1% TiC addition also effectively refined grain size in the weldment.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1361343

Alternate ID(s):: OSTI ID: 1439767

Journal Information:: Materials & Design, Vol. 129, Issue C; ISSN 0264-1275

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 66 works

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