Low cycle fatigue behaviour of new type of stainless steel

Xia, Yu; Wang, Z.G.

doi:10.1016/0921-5093(92)90178-4

Materials Science and Engineering: A

1992

DOI: 10.1016/0921-5093(92)90178-4

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Low cycle fatigue behaviour of new type of stainless steel

Yu Xia¹,

Z.G. Wang²

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Cited by 19 publications

References 7 publications

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Fatigue deformation-induced response in a superduplex stainless steel

Goh

Tick-Hon

2002

Metall Mater Trans A

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The cyclic deformation behavior of SAF 2507 superduplex stainless steel (SDSS) was studied under constant plastic-strain amplitudes. The cyclic hardening/softening curves show initial hardening, followed by softening and, finally, saturation behavior. Two regimes can be differentiated in the cyclic stress-strain curve (CSSC) of SDSS. The transition point at which the cyclic strain-hardening rate changes is identified to be p /2 ϭ 7 ϫ 10 Ϫ3 . Transmission electron microscopy (TEM) results on dislocation structures suggested that there is a close relationship between the CSSC, hardening/ softening curves, and the dislocation substructure evolution. In the low-plastic-strain-amplitude regime of the CSSC, the dislocation activity in the austenite grains is found to be higher than that in the ferrite grains. At higher plastic strain amplitudes, low-energy dislocation structures are found in the ferrite grains, while clusters and bundles of dislocations can be observed in the austenite grains. Strain localization due to formation of these structures resulted in a decrease in the cyclic strain-hardening rate within the high-plastic-strain-amplitude regime. Dislocation substructure evolution is also used to explain the shape of the hardening/softening curve.

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Fatigue deformation-induced response in a superduplex stainless steel

Goh

Tick-Hon

2002

Metall Mater Trans A

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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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On the Relationship Between Cyclic Deformation Behavior and Slip Mode in 316LN Stainless Steel with Varying Nitrogen Content

Reddy

Sandhya

Sankaran

et al. 2015

Trans Indian Inst Met

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Low cycle fatigue behaviour of new type of stainless steel

Cited by 19 publications

References 7 publications

Fatigue deformation-induced response in a superduplex stainless steel

Fatigue deformation-induced response in a superduplex stainless steel

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

On the Relationship Between Cyclic Deformation Behavior and Slip Mode in 316LN Stainless Steel with Varying Nitrogen Content

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