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Electron Beam Welding and Characterization of Dissimilar Joints with TWIP Matrix Composites
Author(s) -
Halbauer Lars,
Laubstein Rudy,
Radajewski Markus,
Buchwalder Anja,
Krüger Lutz,
Biermann Horst
Publication year - 2019
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201800586
Subject(s) - twip , materials science , welding , electron beam welding , composite material , microstructure , metallurgy , cathode ray , austenite , electron , physics , quantum mechanics
Welding of Mg‐PSZ‐reinforced TWIP metal matrix composites (TWIP MMC) requires precise control over the level of dilution: otherwise, the risk of cavity formation arises. For this work, dissimilar joints between a TWIP MMC and an AISI 304 stainless steel are produced by means of electron beam welding over a wide range of process parameters. The influence of the welding process on the dilution, the microstructure of the welding seam, and the mechanical properties is presented and classified according to DIN EN ISO 13919–1. Furthermore, the welding quality of the samples is characterized by non‐destructive testing methods such as the novel uit and X‐ray analysis. It is shown that joints with EG ≥ ‘C’ can be produced with a high degree of reproducibility within a parameter window of Δx = 0.40.6 mm at welding speeds of 15 and 5 mm s −1 . The main defects are cavities, underfill, and lack of fusion which can all be detected by the uit down to a minimum defect size of 90–100 µm. Lower welding speeds and a slight underfocus decrease the tendency toward defects and for a (Δx) = 0.5 mm, tensile properties are achieved to match the level of the TWIP MMC.