Microstructural manifestation of dynamic strain aging in AISI 316 stainless steel

Karlsen, Wade; Ivanchenko, Mykola; Ehrnstén, Ulla; Yagodzinskyy, Yuriy; Hänninen, Hannu

doi:10.1016/j.jnucmat.2009.10.047

Cited by 82 publications

(31 citation statements)

References 15 publications

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“…Serrated flow, one of the characteristics of DSA, was not observed in AR and AQ samples. The serrated flow occurs when the solute atoms move to the dislocations and prevent their motion [20][21][22] . It is now well accepted that serrated yielding exhibited by a material occurs due to interaction between diffusing solute atoms and dislocations 23 .…”

Section: Resultsmentioning

confidence: 99%

The Effect of Heat Treatment on Dynamic Strain Aging Behaviour of AISI H10 Hot Work Tool Steel

Taştemür

Gündüz

2017

Mat. Res.

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Dynamic strain aging (DSA) behaviour of hot work tool steel (H10) was investigated under asreceived (AR) and as-quenched (AQ) conditions. Hot tensile test was carried out in the temperatures of 25°C-700°C at a strain rate of 1x10 -3 s -1 . The tensile properties indicated that AQ samples showed an increase in yield strength (YS) and ultimate tensile strength (UTS) but a decrease in elongation at 200°C or 300°C consistent with DSA. However, AR samples revealed a decrease in YS and UTS for the same testing temperatures. This indicated the presence of less amount of free C or N in solution of AR samples. Further increase in the testing temperature has increased the elongation. It is believed that DSA occurs in H10 tool steel at different temperatures because of interaction between dislocations and interstitial solute atoms (C or N) or substitutional atoms (Cr or Mo).

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Section: Resultsmentioning

confidence: 99%

The Effect of Heat Treatment on Dynamic Strain Aging Behaviour of AISI H10 Hot Work Tool Steel

Taştemür

Gündüz

2017

Mat. Res.

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“…The PLC effect is created by the pinning and unpinning of dislocations and is recognized by serrated yielding in stress and strain curves [15,[48][49][50]. There are different types of PLC effects and they have designated appearance [15,48,50].…”

Section: Dynamic Strain Ageingmentioning

confidence: 99%

“…There are different types of PLC effects and they have designated appearance [15,48,50]. Type A is considered as locking serrations, they abruptly rise and then drop to a stress level below the general level.…”

Section: Dynamic Strain Ageingmentioning

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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“…[10,11] DSA can lead to an increase in flow stress and strain hardening rate. [12,13] Austenitic stainless steels show DSA in a temperature range from 473 K to 1073 K (200 C to 800 C), [14][15][16] which includes both the operating temperatures of today's power plants and the elevated operating temperatures for future power plants. [5] DSA originates from interaction between solute atoms and dislocations during plastic deformation.…”

Section: Introductionmentioning

confidence: 99%

“…The PLC effect is caused by the pinning and unpinning of dislocations. [13,16,22,23] There are different types of PLC effects, designated A to D. [13,16,23] Type A is considered as locking serrations which abruptly rise and then drop to a stress level below the general level. Type B is characterized by small oscillations around the general level of the curve.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Austenitic Stainless Steels Deformed at Elevated Temperature

Calmunger

Chai

Eriksson

et al. 2017

Metall Mater Trans A

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Highly alloyed austenitic stainless steels are promising candidates to replace more expensive nickel-based alloys within the energy-producing industry. The present study investigates the deformation mechanisms by microstructural characterization, mechanical properties and stress–strain response of three commercial austenitic stainless steels and two commercial nickel-based alloys using uniaxial tensile tests at elevated temperatures from 673 K (400 $$^{\circ }$$ ∘ C) up to 973 K (700 $$^{\circ }$$ ∘ C). The materials showed different ductility at elevated temperatures which increased with increasing nickel content. The dominating deformation mechanism was planar dislocation-driven deformation at elevated temperature. Deformation twinning was also a noticeable active deformation mechanism in the heat-resistant austenitic alloys during tensile deformation at elevated temperatures up to 973 K (700 $$^{\circ }$$ ∘ C).

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Microstructural manifestation of dynamic strain aging in AISI 316 stainless steel

Cited by 82 publications

References 15 publications

The Effect of Heat Treatment on Dynamic Strain Aging Behaviour of AISI H10 Hot Work Tool Steel

The Effect of Heat Treatment on Dynamic Strain Aging Behaviour of AISI H10 Hot Work Tool Steel

High-Temperature Behaviour of Austenitic Alloys

Characterization of Austenitic Stainless Steels Deformed at Elevated Temperature

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