Temperature dependence of strain hardening and plastic instability behaviors in austenitic stainless steels

Byun, Thak Sang; Hashimoto, Naoyuki; Farrell, K.

doi:10.1016/j.actamat.2004.05.003

Cited by 388 publications

(198 citation statements)

References 29 publications

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“…Above this strain the value of dσ/dε raises significantly up to 20% of true strain and then falls abruptly until fracture. A similar behavior was reported by Byun et al 22 in 304 and 316 steels at subzero temperatures, where theses steels are also metastable.…”

Section: Tensile Propertiessupporting

confidence: 68%

“…The martensite acts as an elastic reinforcing phase as it supports a higher stress than the austenite tensile loading even though the martensite co-deforms plastically with the austenite. Byun et al 22 investigated the work hardening dependence on the instability of several austenitic stainless steels, 304, 316 and 316LN. From room temperature until -150°C, the work hardening exhibits two stages consisting of a rapid decrease for small strains and an increase-decrease cycle before plastic instability occurs.…”

Section: Introductionmentioning

confidence: 99%

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Fracture Modes of AISI Type 302 Stainless Steel Under Metastable Plastic Deformation

et al. 2017

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Martensitic transformation can be induced by plastic deformation in metastable iron-based alloys, such as stainless steels containing limited amounts of C, Ni and Cr. This transformation takes place at the temperature range from M s and M d , usually at relatively lower temperature values. The transformed martensite has been associated with maximum ultimate strength and relatively high ductility. In the present work, the tensile fracture characteristics of a metastable AISI type 302 stainless steel was investigated in the range of temperatures from -196°C to 25°C. Mechanical properties were compared to those of a stable AISI type 310 austenitic stainless steel. It was found that in 302 steel, its high degree of metastability and dilute dispersion of inclusions result in higher strength and complex modes of fracture, one of which consisting of martensite surrounding globular inclusions.

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Section: Tensile Propertiessupporting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Fracture Modes of AISI Type 302 Stainless Steel Under Metastable Plastic Deformation

et al. 2017

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“…The effect of test temperature on elongation is also notable; the tensile data are consistent with other reported data. [15] In all cases, HIP304L exhibits a slight improvement in strength, but a slight reduction in ductility, as can be seen in the overall recorded elongation. The improved strength is associated with HIP's finer grain size (27 lm cf.…”

mentioning

confidence: 75%

Effect of Temperature on the Fracture Toughness of Hot Isostatically Pressed 304L Stainless Steel

Cooper

Brayshaw

Sherry

2018

Metall Mater Trans A

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Herein, we have performed J-Resistance multi-specimen fracture toughness testing of hot isostatically pressed (HIP'd) and forged 304L austenitic stainless steel, tested at elevated (300°C) and cryogenic (À 140°C) temperatures. The work highlights that although both materials fail in a pure ductile fashion, stainless steel manufactured by HIP displays a marked reduction in fracture toughness, defined using J 0.2BL , when compared to equivalently graded forged 304L, which is relatively constant across the tested temperature range.https://doi.org/10.1007/s11661-018-4466-x Ó The Author(s) 2018. This article is an open access publication Hot isostatic pressing (HIP) is a component manufacturing technique, which employs the use of high temperature, and isostatically controlled pressure to consolidate metal alloy power of desired chemistry into bulk metal under an inert (usually argon) atmosphere. [1] The advantages of HIP are well documented, [1][2][3][4] the most significant being within HIP's ability to produce near-net shape components; components with exceedingly complex geometries thus eliminating the need for subsequent machining/welding procedures on the manufactured component. This may not only reduced the costs associated with the overall manufacture process, but through the elimination of welded joints, produces components of homogenous metallurgy; omitting common issues associated with welding of components; hot cracking, different metallurgical zones, induced residual stresses, etc. This is clearly an advantage for components which will be subjected to high stress conditions throughout their lifetime. The degree of metallurgical homogeneity which HIP produces results in no grain directionality, like that commonly seen in forgings, due to the isostatically controlled pressure and temperature and therefore HIP materials display isotropic mechanical properties. Finally, HIP produces material with a comparatively smaller grain size than that of forgings and castings, which not only improves the yield strength and ultimate tensile strength, also lends itself to easier inspection view non-destructive examination techniques.Because of HIP's ability to increase design freedom, there have been increased efforts to demonstrate that components produced by HIP have equivalent or better material properties than those of equivalently graded forged materials. However, the authors have recently shown that the fracture behavior is subtly different between equivalently graded HIP and forged austenitic stainless steel, with HIP 304L and 316L exhibiting a reduction in impact toughness [5,6] as well as HIP 304L exhibiting a reduction in J-integral fracture toughness at ambient temperature. [7,8] This difference in fracture behavior was attributed to the presence of a comparatively large volume fraction of non-metallic oxide inclusions in the HIP microstructure, which lower the energy required to cause fracture via an unzipping effect, whereby ductile void growth is unable to occur on the same scale as in forged stainless steel...

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“…This behaviour seemed being independent of strain rate up to 2500 s -1 , but was dependent on temperature: twin structure developed faster (at lower strains) with a decrease in temperature. In 16.3 wt.% Ni -10.2 Cr -2.01 Mo -0.11 N austenitic stainless steel with an increase in test temperature to 200 °C the dislocation slip was the main deformation mechanism up to 50 % strain; the twin formation was not observed, although some staking faults (which are considered being the precursors for twinning) were present [25]. In 9 wt.…”

Section: Introductionmentioning

confidence: 96%

High temperature dislocation structure and NbC precipitation in three Ni–Fe–Nb–C model alloys

2015

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, O. O. (2015). High temperature dislocation structure and NbC precipitation in three NiFe-Nb-C model alloys. Journal of Materials Science, 50 (21), 7115-7125. High temperature dislocation structure and NbC precipitation in three NiFe-Nb-C model alloys AbstractIn this original work, the dislocation structure and NbC precipitation were investigated in three Ni-based alloys (70Ni-Fe-0.331Nb-0.040C, 70Ni-Fe-0.851Nb-0.114C and 70Ni-Fe-1.420Nb-0.157C, wt%) thermomechanically processed in the temperature range of 1250-1075 °C. The dislocation structure inhomogeneity (dislocation networks and cell walls), which we observed in the middle and high Nb+C alloys, resulted from the dislocation pile-ups in the vicinity of >200 nm NbC particles. The dislocation density around >200 nm particles exceeded the average values by 5-7 times, and that in the cell walls might exceed the average values by 10 times. Twins and stacking faults were observed in all alloys after solution treatment at 1250 °C, however, they were not observed after 1.2 strain at 1075 °C. The dislocation generation rate during deformation at 1075 °C varied with alloy composition and increased with an increase in the°C, the majority of particles were growing in the high Nb+C alloy, theNb+C alloy and all the particles were dissolving in the low Nb+C alloy. Deformation to 1.2 strain at 1075 °C resulted in strain-induced precipitation in all alloys andNb+C alloys. Twins and stacking faults were observed in all alloys after solution treatment at 1250 C, however they were not observed after 1.2 strain at 1075 C. The dislocation generation rate during deformation at 1075 C varied with alloy composition and increased with an increase in the < 20 nm particle number density. During cooling in the temperature range of 1250 -1075 C the majority of particles were growing in the high Nb+C alloy, the < 20 nm particles were growing in the middle Nb+C alloy, and all the particles were dissolving in the low Nb+C alloy.Deformation to 1.2 strain at 1075 C resulted in strain-induced precipitation in all alloys and < 20 nm particle growth in the high and middle Nb+C alloys.

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Temperature dependence of strain hardening and plastic instability behaviors in austenitic stainless steels

Cited by 388 publications

References 29 publications

Fracture Modes of AISI Type 302 Stainless Steel Under Metastable Plastic Deformation

Fracture Modes of AISI Type 302 Stainless Steel Under Metastable Plastic Deformation

Effect of Temperature on the Fracture Toughness of Hot Isostatically Pressed 304L Stainless Steel

High temperature dislocation structure and NbC precipitation in three Ni–Fe–Nb–C model alloys

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