Zitieren Sie bitte immer diesen URN: urn:nbn:de:kobv:b43-459683
Residual stress formation in component related stress relief cracking tests of a welded creep-resistant steel
- Submerged arc welded (SAW) components of creep-resistant low-alloyed Cr-Mo-V steels are used for thick-walled heavy petrochemical reactors (wall-thickness up to 475 mm) as well as employed in construction of modern high-efficient fossil fired power plants. These large components are accompanied by significant restraints during welding fabrication, especially at positions of different thicknesses like welding of nozzles. As a result, residual stresses occur, playing a domi-nant role concerning so-called stress relief cracking (SRC) typically during post weld heat treat-ment (PWHT). Besides specific metallurgical factors (like secondary hardening due to re-precipitation), high tensile residual stresses are a considerable influence factor on SRC. For the assessment of SRC susceptibility of certain materials mostly mechanical tests are applied which are isolated from the welding process. Conclusions regarding the influence of mechanical factors are rare so far. The present research followsSubmerged arc welded (SAW) components of creep-resistant low-alloyed Cr-Mo-V steels are used for thick-walled heavy petrochemical reactors (wall-thickness up to 475 mm) as well as employed in construction of modern high-efficient fossil fired power plants. These large components are accompanied by significant restraints during welding fabrication, especially at positions of different thicknesses like welding of nozzles. As a result, residual stresses occur, playing a domi-nant role concerning so-called stress relief cracking (SRC) typically during post weld heat treat-ment (PWHT). Besides specific metallurgical factors (like secondary hardening due to re-precipitation), high tensile residual stresses are a considerable influence factor on SRC. For the assessment of SRC susceptibility of certain materials mostly mechanical tests are applied which are isolated from the welding process. Conclusions regarding the influence of mechanical factors are rare so far. The present research follows an approach to reproduce loads, which occur during welding of real thick-walled components scaled to laboratory conditions by using tests designed on different measures. A large-scale slit specimen giving a high restraint in 3 dimensions by high stiffness was compared to a medium-scale multi-pass welding U-profile specimen showing a high degree of restraint in longitudinal direction and a small-scale TIG-re-melted specimen. The small-scale specimens were additionally subjected to mechanical bending to induce loads that are found during fabrication on the real-scale in heavy components. Results show for all three cases compa-rable high tensile residual stresses up to yield strength with high gradients in the weld metal and the heat affected zone. Those high tensile stresses can be significant for cracking during further PWHT.…
Autor*innen: | Michael RhodeORCiD, Arne KrommORCiD, Dirk Schroepfer, J. Steger, Thomas KannengießerORCiD |
---|---|
Persönliche Herausgeber*innen: | M. Seefeldt |
Dokumenttyp: | Beitrag zu einem Tagungsband |
Veröffentlichungsform: | Verlagsliteratur |
Sprache: | Englisch |
Titel des übergeordneten Werkes (Englisch): | RESIDUAL STRESSES 2018, ECRS-10 |
Jahr der Erstveröffentlichung: | 2018 |
Organisationseinheit der BAM: | 9 Komponentensicherheit |
9 Komponentensicherheit / 9.0 Abteilungsleitung und andere | |
9 Komponentensicherheit / 9.2 Versuchsanlagen und Prüftechnik | |
9 Komponentensicherheit / 9.4 Integrität von Schweißverbindungen | |
Veröffentlichende Institution: | Bundesanstalt für Materialforschung und -prüfung (BAM) |
Verlag: | Materials Research Forum LLC |
Verlagsort: | Millersville, PA, USA |
Jahrgang/Band: | 6 |
Erste Seite: | 185 |
Letzte Seite: | 190 |
DDC-Klassifikation: | Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurwissenschaften und zugeordnete Tätigkeiten |
Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurbau | |
Freie Schlagwörter: | Creep-resistant steel; Post Weld Heat Treatment (PWHT); Residual stresses; Stress Relief Cracking (SRC); Welding |
Themenfelder/Aktivitätsfelder der BAM: | Infrastruktur |
Material | |
Material / Degradation von Werkstoffen | |
Veranstaltung: | European Conference on Residual Stresses 2018 - ECRS-10 |
Veranstaltungsort: | Leuven, Belgium |
Beginndatum der Veranstaltung: | 11.09.2018 |
Enddatum der Veranstaltung: | 14.09.2018 |
DOI: | 10.21741/9781945291890-29 |
URN: | urn:nbn:de:kobv:b43-459683 |
ISSN: | 2474-395X |
ISSN: | 2474-3941 |
ISBN: | 978-1-9452-9188-3 |
ISBN: | 978-1-9452-9189-0 |
Verfügbarkeit des Dokuments: | Datei für die Öffentlichkeit verfügbar ("Open Access") |
Lizenz (Deutsch): | Creative Commons - CC BY - Namensnennung 4.0 International |
Datum der Freischaltung: | 19.09.2018 |
Referierte Publikation: | Ja |
Datum der Eintragung als referierte Publikation: | 20.12.2018 |
Schriftenreihen ohne Nummerierung: | Wissenschaftliche Artikel der BAM |