Stability of grain-refined reversed structures in a 301LN austenitic stainless steel under cyclic loading

Järvenpää, Antti; Jaskari, Matias; Man, Jiří; Karjalainen, L.P.

doi:10.1016/j.msea.2017.07.033

Cited by 26 publications

(45 citation statements)

References 57 publications

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“…This indicates that both the diffusional and shear mechanisms are active under these conditions. The simultaneous operation of both mechanisms-though the diffusional is the major one-was found earlier, by the present authors, after annealing at 700-800 °C [20,21], and also by Kisko et al [23], who observed both mechanisms in a 204Cu type Cr-Mn steel at low annealing temperatures.…”

Section: Early Stages Of Reversionsupporting

confidence: 83%

“…The grain size of the DA was coarse-approximately 23 µm. It can be mentioned that the DIM contents measured on the cross-sections of the samples tended to be slightly higher, indicating higher amounts of martensite at the sheet centerline region, as shown and discussed earlier [20,21].…”

Section: Cold Rolled Microstructuresupporting

confidence: 66%

“…The annealing temperature and holding time applied were 900 • C and 1 s, and 750 • C and 0.1 s, to create the desired two microstructures-a completely reversed austenitic and a partially reversed structure-coded based on the annealing temperature and holding time being 900-1 and 750-0.1, respectively. These structures, after the 63% CR reduction, were investigated previously and the latter structure exhibits the highest strength among the structures studied [20,21]. However, the partially reversed structure contains some retained DIM which disturbs observations concerning the nucleation sites of new DIM in tensile straining, so that also an austenitic structure without any retained DIM, but otherwise closely resembling the 750-0.1 structure, was created by annealing at 800 • C for 10 s after the 32% CR reduction (coded 800-10-32CR).…”

Section: Reversion Heat Treatmentsmentioning

confidence: 94%

“…However, the partially reversed structure contains some retained DIM which disturbs observations concerning the nucleation sites of new DIM in tensile straining, so that also an austenitic structure without any retained DIM, but otherwise closely resembling the 750-0.1 structure, was created by annealing at 800 • C for 10 s after the 32% CR reduction (coded 800-10-32CR). To study the early state of the reversion, some 32CR and 63CR samples were annealed at a lower temperature of 700 • C for 0.1 s or 1 s. Some data from earlier experiments were used as references to demonstrate the differences with coarse-grained and ultrafine-grained austenite structures [20,21].…”

Section: Reversion Heat Treatmentsmentioning

confidence: 99%

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Reversed Microstructures and Tensile Properties after Various Cold Rolling Reductions in AISI 301LN Steel

Järvenpää

Jaskari

Karjalainen

2018

Metals

Self Cite

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Heavy cold rolling is generally required for efficient grain size refinement in the martensitic reversion process, which is, however, not desirable in practical processing. In the present work, the influence of cold rolling reductions of 32%, 45% and 63% on the microstructure evolution and mechanical properties of a metastable austenitic AISI 301LN type steel were investigated in detail adopting scanning electron microscopy with the electron backscatter diffraction method and mechanical testing. A completely austenitic microstructure and a partially reversed counterpart were created. It was found that the fraction of grains with a size of 3 µm or larger, called medium-sized grains, increased with decreasing the prior cold rolling reduction. These grains are formed mainly from the shear-reversed austenite, transformed from slightly-deformed martensite, by gradual evolution of subgrains to grains. However, in spite of significant amounts of medium-sized grains, the tensile properties after the 32% or 45% cold rolling reductions were practically equal to those after the 63% reduction. The austenite stability against the formation of deformation-induced martensite in subsequent straining was reduced by lowering the cold rolling reduction, due to the larger grain size of medium-sized grains and the shift of their orientation towards {211} .

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Section: Early Stages Of Reversionsupporting

confidence: 83%

Section: Cold Rolled Microstructuresupporting

confidence: 66%

Section: Reversion Heat Treatmentsmentioning

confidence: 94%

Section: Reversion Heat Treatmentsmentioning

confidence: 99%

See 2 more Smart Citations

Reversed Microstructures and Tensile Properties after Various Cold Rolling Reductions in AISI 301LN Steel

Järvenpää

Jaskari

Karjalainen

2018

Metals

Self Cite

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“…In fact, many commercial ASSs are metastable against the martensitic transformation during deformation. As a result, cold deformation below a specific temperature is accompanied by the transformation of austenite to martensite and the resulting inhibition of necking, which is known as transformation‐induced plasticity (TRIP) effect . Järvenpää et al reported a two‐stage hardening behavior for AISI 301LN austenitic steel while investigating the effect of grain size: first, the work‐hardening rate decreases rapidly, reaching a minimum at a certain strain, and then, when the martensite formation reaches a rate high enough, the work‐hardening rate starts to increase reaching a maximum.…”

Section: Introductionmentioning

confidence: 99%

Effects of Grain Size on Mechanical Properties and Work‐Hardening Behavior of AISI 304 Austenitic Stainless Steel

Naghizadeh

Mirzadeh

2019

steel research int.

127

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Grain size effects on the properties of AISI 304 austenitic stainless steel are studied. Yield stress (YS) and ultimate tensile strength (UTS) increased with decreasing grain size (Hall–Petch law) while the difference between YS and UTS decreased. Three distinct stages for work‐hardening rate are identified: I) initial rapid fall until reaching a minimum value, II) subsequent rise to a maximum due to the transformation‐induced plasticity (TRIP) effect, which is found to enhance by increasing grain size, and III) final fall until the onset of necking. More in‐depth analysis on the mechanical stability of austenite reveals that for below‐average grain size of ≈50 μm, by decreasing grain size, the TRIP effect diminishes; whereas for grain size larger than ≈50 μm, by increasing grain size, the TRIP effect becomes less pronounced. Due to the strong TRIP effect, high incremental work‐hardening exponents (n‐values of higher than 0.8) and low‐yield ratios (smaller than 0.5) are observed. It is also found that when the average grain size increases, the tensile toughness and the size and depth of dimples increase. The latter is responsible for the tardiness of the microcavity coalescence, which is indicative of high ductility of this austenitic alloy.

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Stainless Steels

San-Martín

Celada-Casero

Vivas

et al. 2020

High-Performance Ferrous Alloys

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Stability of grain-refined reversed structures in a 301LN austenitic stainless steel under cyclic loading

Cited by 26 publications

References 57 publications

Reversed Microstructures and Tensile Properties after Various Cold Rolling Reductions in AISI 301LN Steel

Reversed Microstructures and Tensile Properties after Various Cold Rolling Reductions in AISI 301LN Steel

Effects of Grain Size on Mechanical Properties and Work‐Hardening Behavior of AISI 304 Austenitic Stainless Steel

Stainless Steels

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