Mechanisms of paint bake response in resistance spot-welded first and third generation AHSS

Shamsujjoha, M.; Enloe, C. M.; Chuang, Andrew Chihpin; Coryell, Jason J.; Ghassemi-Armaki, H.

doi:10.1016/j.mtla.2020.100975

Mechanisms of paint bake response in resistance spot-welded first and third generation AHSS

Journal Article · Wed Dec 02 00:00:00 EST 2020 · Materialia

DOI:https://doi.org/10.1016/j.mtla.2020.100975· OSTI ID:1779839

^[1]; ^[2]; Chuang, Andrew Chihpin ^[3]; Coryell, Jason J. ^[4]; ^[1]

ArcelorMittal Global R&D, East Chicago, IN (United States)
CBMM North America, Pittsburgh, PA (United States)
Argonne National Lab. (ANL), Argonne, IL (United States). X-ray Science Div.
General Motors, Warren, MI (United States). Materials Engineering - Body Structures and Closures

Implementation of 3rd generation advanced high strength steels (3GAHSS) in automotive structures requires careful consideration of joining process implications. Due to the presence of increased carbon equivalent in 3GAHSS such as 980 HF relative to commonly-applied 1st generation AHSS such as 980 DP, the resultant properties of the weld nugget and heat affected zones in resistance spot welded must be engineered to provide consistent and acceptable performance, specifically in cross-tension loading mode. Although the as-welded cross-tension strength (CTS) of 980 HF is less than 980 DP, there is a significant improvement of the CTS after paint baking in 980 HF welds. 980 DP steel welds do not exhibit such marked improvement upon baking. The mechanism of the strong and beneficial effect of paint baking on 980 HF in comparison to 980 DP is discussed in light of its effect on residual stress distributions and microstructures. Although residual stress (strain) reduction is observed via synchrotron x-ray diffraction for all tested steels, this effect is demonstrated as secondary to the performance restoration of the weld joint in cross tension. High-resolution electron channeling contrast imaging (ECCI) micrographs reveal that paint baking affects a more beneficial degree of martensite tempering in 980 HF as compared to 980 DP. The martensite tempering is also evidenced by both a reduction in nano-hardness of critical microstructural features and re-emergence of ductile fracture behavior following the paint baking process. The tempering of martensite is concluded to be the dominant mechanism in improving cross tension strength of 3GAHSS welds following paint baking.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1779839

Alternate ID(s):: OSTI ID: 1809860

Journal Information:: Materialia, Journal Name: Materialia Vol. 15; ISSN 2589-1529

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
42 ENGINEERING
Advanced high strength steel
paint bake
residual stress
resistance spot welding

Mechanisms of paint bake response in resistance spot-welded first and third generation AHSS

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