Effects of Nitrogen on the Deformation Behavior of Duplex Stainless Steel

Lee, H.J.; Chang, Young Won

doi:10.4028/www.scientific.net/msf.426-432.951

Cited by 2 publications

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“…The increased strength achieved by alloying with nitrogen is essentially attributed to interstitial solid solution strengthening of both austenite and ferrite. Research work on the influence of nitrogen is often carried out by combining macroscopic mechanical tests with microhardness tests which measure the hardness of individual phases [4,5]. On the other hand, the mechanical properties of SDSSs are determined by the behaviours of the constituent austenite and ferrite, which depend not only on the single phase properties but also interactions between the phases under loading [6,7].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Micromechanical Behaviour of Duplex Stainless Steel SAF 2507 and the Influence of Nitrogen Content

Peng

Chai

Stein

et al. 2011

MSF

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The deformation behaviour of four super duplex stainless steels of the grade SAF 2507 (UNS S32750) were studied by X-ray diffraction experiment with in-situ uniaxial tensile load. The steels had different nitrogen contents, between 0.2 and 0.33%, and/or different volume fractions of the ferrite, between 37% and 49%, in balance with austenite. The development of phase-specific stresses under external loading up to over 10% tensile strain was followed. The X-ray diffraction measurements revealed that load partitioning between the phases changed with increasing applied load, as the ferrite and austenite exhibited different deformation hardening behaviours. At the onset of macroscopic yielding and low plastic strains, a load transfer from γ to α occurred due to higher yield strength and strain hardening rate of the ferrite but vice versa at larger plastic strains when the austenite hardened more rapidly than the ferrite. It was also concluded that both the yield and tensile strengthen of the steels increased with increasing nitrogen content due to increased strengthen of the austenite by additional solid solution hardening, whereas a higher volume fraction of austenite contributed to higher tensile strength.

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Section: Introductionmentioning

confidence: 99%

Experimental Study of the Micromechanical Behaviour of Duplex Stainless Steel SAF 2507 and the Influence of Nitrogen Content

Peng

Chai

Stein

et al. 2011

MSF

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Role of nitrogen in the cyclic deformation behavior of duplex stainless steels

Lee

Chang

2005

Metall Mater Trans A

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The role of nitrogen in the cyclic deformation behavior of duplex stainless steels (DSS) has been studied under fully reversed total-strain amplitude. The cyclic hardening-softening curves show that cyclic stress levels become lower with increasing nitrogen content. The cyclic softening becomes more evident with increasing nitrogen content. It can be attributed to the greater strength of austenite than that of ferrite as plastic strain is accumulated beyond the critical strain. This is achieved by a higher strain hardening of austenite than that of ferrite with increasing nitrogen content. In this regard, the higher austenite volume fraction is also responsible for higher cyclic softening, resulting from much stronger strain partitioning in ferrite. Dislocation-structure observations reveal that severe strain localization in ferrite causes greater cyclic softening in the alloys with higher nitrogen content. The cyclic stress-strain response can be described in terms of two regimes with low and high plastic-strain amplitudes. In the former regime, the cyclic strain-hardening rates (CSHRs) become higher with increasing nitrogen content because austenite dominantly takes part in plastic deformation, being more strain hardened due to the higher nitrogen content in austenite. On the contrary, those in the high-plastic-strain-amplitude regime hardly change because ferrite, more dominantly accommodating plastic strain, rarely shows a change of strain-hardening behavior due to the similar nitrogen content in ferrite.

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Effects of Nitrogen on the Deformation Behavior of Duplex Stainless Steel

Cited by 2 publications

References 0 publications

Experimental Study of the Micromechanical Behaviour of Duplex Stainless Steel SAF 2507 and the Influence of Nitrogen Content

Experimental Study of the Micromechanical Behaviour of Duplex Stainless Steel SAF 2507 and the Influence of Nitrogen Content

Role of nitrogen in the cyclic deformation behavior of duplex stainless steels

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