Modified TEKKEN test for studying hydrogen-assisted cracking in high-strength structural steels
- In the present work, the complex interactions of the influences of material, welding process and seam configuration and the restraint of shrinkage on the residual stresses and the influence of diffusible hydrogen on hydrogen-assisted cracking (HAC) in the high-strength steel S960QL were investigated. For this purpose, self-restraint specimens were selected using the TEKKEN test with correspondingly adapted seam opening angles and a restraint intensity of approx. RFy = 17 kN/(mm·mm). The variation of the seam opening angle of the test seams was between 30° and 60°. Due to the comparatively high restraint of shrinkage in the transverse direction of the weld, high tensile residual stresses in the weld metal were expected for both weld seam configurations. In addition, a dehydrogenation heat treatment (DHT) for HAC prevention under restraint of shrinkage was verified. In order to keep distortion and heat input as low as possible, the seam geometries were manufactured from the solidIn the present work, the complex interactions of the influences of material, welding process and seam configuration and the restraint of shrinkage on the residual stresses and the influence of diffusible hydrogen on hydrogen-assisted cracking (HAC) in the high-strength steel S960QL were investigated. For this purpose, self-restraint specimens were selected using the TEKKEN test with correspondingly adapted seam opening angles and a restraint intensity of approx. RFy = 17 kN/(mm·mm). The variation of the seam opening angle of the test seams was between 30° and 60°. Due to the comparatively high restraint of shrinkage in the transverse direction of the weld, high tensile residual stresses in the weld metal were expected for both weld seam configurations. In addition, a dehydrogenation heat treatment (DHT) for HAC prevention under restraint of shrinkage was verified. In order to keep distortion and heat input as low as possible, the seam geometries were manufactured from the solid material by means of electric discharge machining (EDM). Both, solid wire and metal cored wire were used. In addition, hydrogen was added to the shielding gas in solid wire welding to increase diffusible hydrogen concentration. Moreover, welding residual stresses at the weld seam surface, which were measured by using mobile X-ray diffraction, were taken into account to evaluate the HAC behavior. DHT was carried out at 250 °C for 4 h in an external furnace.…
Autor*innen: | Thomas SchauppORCiD |
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Weitere Person: | Dirk Schroepfer, Nina Schroeder, Thomas KannengießerORCiD |
Dokumenttyp: | Vortrag |
Veröffentlichungsform: | Präsentation |
Sprache: | Englisch |
Jahr der Erstveröffentlichung: | 2020 |
Organisationseinheit der BAM: | 9 Komponentensicherheit |
9 Komponentensicherheit / 9.4 Integrität von Schweißverbindungen | |
DDC-Klassifikation: | Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurwissenschaften und zugeordnete Tätigkeiten |
Freie Schlagwörter: | Dehydrogenation heat treatment; Gas metal arc welding; High-strength steel; Hydrogen-assisted cracking; Residual stresses; TEKKEN test |
Themenfelder/Aktivitätsfelder der BAM: | Material |
Material / Degradation von Werkstoffen | |
Veranstaltung: | 73rd IIW Annual Assembly: Commission II-A |
Veranstaltungsort: | Online meeting |
Beginndatum der Veranstaltung: | 15.07.2020 |
Enddatum der Veranstaltung: | 25.07.2020 |
Verfügbarkeit des Dokuments: | Datei im Netzwerk der BAM verfügbar ("Closed Access") |
Datum der Freischaltung: | 22.07.2020 |
Referierte Publikation: | Nein |
Eingeladener Vortrag: | Nein |