Intergranular damage in AISI 316L(N) austenitic stainless steel at 600°C: Pre-strain and multiaxial effects

In this review article, we examine the influence of prior deformation (prestrain) on the subsequent high temperature mechanical behaviour of engineering alloys. We review the observed effects at a macroscopic level in terms of creep deformation, creep rupture times and crack growth rates from a number of sources and a range of materials. Microstructural explanations for the observed macroscopic effects are also reviewed and constitutive models which incorporate the effect of prior deformation are examined. The emphasis in the paper is on engineering steels though reference is also made to non ferrous alloys.

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“…Auzoux et al [21] examined the effect of prestrain on the subsequent creep fracture behavior of 316L(N) austenitic stainless steel at 600…”

Section: Effects On Creep Fracturementioning

confidence: 99%

A review of the effect of prior inelastic deformation on high temperature mechanical response of engineering alloys

O’Dowd

Davies

et al. 2010

International Journal of Pressure Vessels and Piping

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“…Thickness, notches and weld defects are deleterious because ductility sharply decreases as stress triaxiality increases [11][12][13][14][15][16][17]. Following the results of the present study, thickness has an additional effect: welding thick components requires numerous welding passes which leads to a high level of pre-strain in the weld-affected zone, which impairs ductility.…”

Section: Reheat Cracking Risk Assessmentmentioning

confidence: 60%

“…Even pre-strained 316H -the most brittle stainless steel studied here -should therefore sustain this strain without cracking. However, creep ductility is known to decrease drastically when stress triaxiality increases [11][12][13][14][15][16][17]. In order to assess the reheat-cracking sensitivity of the studied materials with more realistic mechanical loading conditions, dedicated mechanical tests with high local stress triaxiality were therefore carried out.…”

Section: Fracture Of Smooth Specimensmentioning

confidence: 99%

“…Such a mechanism is consistent with the reheat-cracking sensitivity of unstabilised stainless steels with a high solute content such as AISI 316H or 316L(N). It also suggests that AISI 316L would be less prone to cracking.Recent work on reheat cracking of unstabilised austenitic stainless steels [11][12][13][14][15][16][17] mostly focused on the influence of stress triaxiality on intergranular damage and on the influence of pre-strain on creep ductility. However, these studies did not mention the role of solute atoms in the cracking mechanism.…”

mentioning

confidence: 99%

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Effect of pre-strain on creep of three AISI 316 austenitic stainless steels in relation to reheat cracking of weld-affected zones

Auzoux

Allais

Caës

et al. 2010

Journal of Nuclear Materials

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“…Moreover, an evaluation of the degradation mechanism stress relaxation cracking [8][9][10][11] is aimed to be achieved. In addition, the obtained knowledge will facilitate the development of new materials for the new generation power plants with better performance with respect to temperature, pressure and environmental conditions.…”

Section: Purpose Of Research and Future Workmentioning

confidence: 99%

High-Temperature Behaviour of Austenitic Alloys

Calmunger¹

2013

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Room: ACAS, Linköping UniversityCover: Dynamic recrystallization in AISI 316L slow strain rate tensile tested at elevated temperature.Printed by: LiU-Tryck, Linköping, Sweden, 2013 ISBN 978-91-7519-512-4 ISSN 0280-7971 Distributed by: Linköping University Department of Management and Engineering SE-581 83, Linköping, Sweden © 2013 Mattias CalmungerThis document was prepared with L A T E X, October 2, 2013 AbstractThe global increase in energy consumption and the global warming from greenhouse gas emission creates the need for more environmental friendly energy production processes. Biomass power plants with higher efficiency could generate more energy but also reduce the emission of greenhouse gases, e.g. CO 2 . Biomass is the largest global contributor to renewable energy and offers no net contribution of CO 2 to the atmosphere. One way to increase the efficiency of the power plants is to increase temperature and pressure in the boiler parts of the power plant.The materials used for the future biomass power plants, with higher temperature and pressure, require improved properties, such as higher yield strength, creep strength and high-temperature corrosion resistance. Austenitic stainless steels and nickel-base alloys have shown good mechanical and chemical properties at the operation temperatures of today's biomass power plants. However, the performance of austenitic stainless steels at the future elevated temperatures is not fully understood.The aim of this licentiate thesis is to increase our knowledge about the mechanical performance of austenitic stainless steels at the demanding conditions of the new generation power plants. This is done by using slow strain rate tensile deformation at elevated temperature and long term hightemperature ageing together with impact toughness testing. Microscopy is used to investigate deformation, damage and fracture behaviours during slow deformation and the long term influence of temperature on toughness in the microstructure of these austenitic alloys. Results show that the main deformation mechanisms are planar dislocation deformations, such as planar slip and slip bands. Intergranular fracture may occur due to precipitation in grain boundaries both in tensile deformed and impact toughness tested alloys. The shape and amount of σ-phase precipitates have been found to strongly influence the fracture behaviour of some of the austenitic stainless steels. In addition, ductility is affected differently by temperature depending on alloy tested and dynamic strain ageing may not always lead to a lower ductility.iii Acknowledgement

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Intergranular damage in AISI 316L(N) austenitic stainless steel at 600°C: Pre-strain and multiaxial effects

Cited by 12 publications

References 19 publications

A review of the effect of prior inelastic deformation on high temperature mechanical response of engineering alloys

A review of the effect of prior inelastic deformation on high temperature mechanical response of engineering alloys

Effect of pre-strain on creep of three AISI 316 austenitic stainless steels in relation to reheat cracking of weld-affected zones

High-Temperature Behaviour of Austenitic Alloys

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