Journal Article

PUBDB-2025-01535

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Retained austenite in multipass high-strength weld metal with a yield strength exceeding 1100 MPa

Schrittwieser, D. (Corresponding author)Extern* ; Rinnhofer, N. ; Obersteiner, D.Extern* ; Pahr, H. ; Glushko, O.Extern* ; Schnitzer, R.Extern*

2025
Elsevier

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Please use a persistent id in citations: doi:10.1016/j.jmrt.2025.04.279  doi:10.3204/PUBDB-2025-01535

Abstract: Retained austenite is an essential phase in various types of steel due to its ability to positively influence mechanicalproperties. However, in the research field of high-strength weld metals, it is typically considered only aspart of martensite-austenite constituents. A detailed quantification of this metastable phase in different heat-affectedzone regions and an assessment of its morphology is largely missing. To address this, the presentstudy investigates the distribution and morphology of retained austenite in high-strength multipass all-weldmetal with a yield strength exceeding 1100 MPa. A quantitative 2D phase map of retained austenite wasgenerated using high-energy X-ray diffraction and Rietveld refinement. Regardless of the former microstructure,the highest retained austenite contents - up to 7.0 % - are observed in the intercritically reheated zones. Thesezones replicate the layer structure of the multipass all-weld metal and are surrounded by tempered regionscontaining less than 2.0 % retained austenite. Using transmission Kikuchi diffraction and electron backscatterdiffraction, only minor amounts of stand-alone retained austenite were detected. Consequently, it is expectedthat the volume fractions of retained austenite may have been underestimated in many former research worksabout low-alloyed high-strength steels and weld metals.

Note: PETRA III. Beamtime was allocated for proposal H-20010018

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. Helmholtz-Zentrum Hereon (Hereon)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)

Experiment(s):

1. PETRA Beamline P07 (PETRA III)

Appears in the scientific report 2025

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