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Investigation of solidification cracking susceptibility in laser welded H400 austenitic stainless steel using digital image correlation technique

  • One trend in today’s structural design for automobiles is towards application of stainless Steel in addition to traditional carbon Steel. This is mainly due to the advantages offered by stainless steel to the designer, i.e. its high corrosion resistance, heat resistance, strength and formability. Welding of austenitic stainless steel involves a high risk of solidification cracking due to low melting eutectics containing different kinds of impurities and to accumulated strain behind the weld pooi in the mushy zone. As a result, the quality of stainless steel welded joints will greatly be affected which may give cause for safety concerns. The intention of this study was to investigate the hot cracking sensitivity of laser welded fully austenitic stainless steels and to determine the critical local strain and strain rate from the formation of solidification cracks. C02-laser welding experiments were conducted using the steel X8CrMnNi19-6-3 (Nirosta H400). Solidification crackingOne trend in today’s structural design for automobiles is towards application of stainless Steel in addition to traditional carbon Steel. This is mainly due to the advantages offered by stainless steel to the designer, i.e. its high corrosion resistance, heat resistance, strength and formability. Welding of austenitic stainless steel involves a high risk of solidification cracking due to low melting eutectics containing different kinds of impurities and to accumulated strain behind the weld pooi in the mushy zone. As a result, the quality of stainless steel welded joints will greatly be affected which may give cause for safety concerns. The intention of this study was to investigate the hot cracking sensitivity of laser welded fully austenitic stainless steels and to determine the critical local strain and strain rate from the formation of solidification cracks. C02-laser welding experiments were conducted using the steel X8CrMnNi19-6-3 (Nirosta H400). Solidification cracking susceptibility was examined with the help of the Controlled Tensile Weldability (CTW) Test developed by BAM Federal Institute for Materials Research and Testing in Berlin. The critical strain and strain rate of solidification cracking was measured at the surface of the workpiece directed to the laser beam in the close vicinity of the weld pool by using the Digital Image Correlation (DIC) technique and diode laser as the illuminating source.zeige mehrzeige weniger

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Metadaten
Autor*innen:Nasim BakirORCiD, Andrey GumenyukORCiD, Michael RethmeierORCiD
Persönliche Herausgeber*innen:H.-J. Wieland, S. Brockmann
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):SCT2014 - Future trends in steel development, processing technologies and applications - 4th International conference on steels in cars and trucks (Proceedings)
Jahr der Erstveröffentlichung:2014
Verlag:Verl. Stahleisen GmbH
Verlagsort:Düsseldorf
Erste Seite:299
Letzte Seite:307
Freie Schlagwörter:CTW test; Critical strains; Digital image correlation; Hot cracking; Hot cracking test; Stainless steels; Strain rates
Veranstaltung:SCT2014 - 4th International conference on steels in cars and trucks
Veranstaltungsort:Braunschweig, Germany
Beginndatum der Veranstaltung:15.06.2014
Enddatum der Veranstaltung:19.06.2014
ISBN:978-3-514-00813-7
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:20.02.2016
Referierte Publikation:Ja
Datum der Eintragung als referierte Publikation:14.08.2014
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