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Secondary Hardening Behavior in Super Duplex Stainless Steels during LCF in Dynamic Strain Ageing Regime
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, The Institute of Technology. Sandvik Materials Technology, Sandviken, Sweden.
Sandvik Materials Technology, Sandviken, Sweden.
2013 (English)In: Procedia Engineering, ISSN 1877-7058, E-ISSN 1877-7058, Vol. 55, 123-127 p.Article in journal (Refereed) Published
Abstract [en]

Cyclic deformation behaviors in five modified duplex stainless steel S32705 grades have been studied at 20 °C, 200 °C, 250° and 350 °C. The influence of temperature and nitrogen concentration on the occurrence of the second hardening phenomenon, in the stress response curve was focused. An increase in nitrogen concentration can have a positive effect on dynamic strain ageing by increasing the first hardening and also the second hardening behavior during cyclic deformation. Furthermore, an increase in nitrogen concentration in the super duplex stainless steel increases the fatigue life in the strain ageing temperature range. The occurrence of strain ageing in duplex stainless steel has greatly changed dislocation structures. The formation of irreversible dislocation structures and stacking faults can contribute to the formation of second hardening in the stress response curve.

Place, publisher, year, edition, pages
Elsevier, 2013. Vol. 55, 123-127 p.
Keyword [en]
duplex stainless steels, static and dynamic strain ageing, nitrogen content, mechanical behavior, ductility
National Category
Materials Engineering
URN: urn:nbn:se:liu:diva-103005DOI: 10.1016/j.proeng.2013.03.230ISI: 000335733500020OAI: diva2:685323
Available from: 2014-01-09 Created: 2014-01-09 Last updated: 2016-05-19Bibliographically approved

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