An investigation into the room temperature mechanical properties of nanocrystalline austenitic stainless steels

Eskandari, M.; Zarei-Hanzaki, A.; Abedi, H.R.

doi:10.1016/j.matdes.2012.08.042

Cited by 51 publications

(13 citation statements)

References 29 publications

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“…Figure 11 shows a Hall-Petch plot for 316L steel using published data [36][37][38][39][40][41] given by values H 0 = 3220 MPa and k H = 580 MPa·µm 1/2 . The data in Fig.…”

Section: Dislocation Density and The Hall-petch Relationshipmentioning

confidence: 99%

Microstructure, phase composition and hardness evolution in 316L stainless steel processed by high-pressure torsion

Gubicza

El-Tahawy

Huang

et al. 2016

Materials Science and Engineering: A

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A 316L stainless steel was processed by high-pressure torsion (HPT) to evaluate the grain refinement and phase transformation. The initial material was essentially a single phase γ-austenite with a coarse-grained microstructure of ~42 µm but the grain size was reduced to ~45 nm after 10 turns of HPT. In addition, there was a phase transformation and the initial γ-austenite transformed initially to ε-martensite and finally to α'-martensite with increasing strain. The dislocation density increased to an exceptionally high value, of the order of ~10 16 m -2 , in the main α'-martensite phase after 10 HPT revolutions. The formation of the multiphase nanocrystalline microstructure yielded a four-fold increase in hardness to reach an ultimate value of ~6000 MPa. The Hall-Petch behavior of the HPT-processed alloy is compared directly with coarse-grained materials.

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“…Figure 11 shows a Hall-Petch plot for 316L steel using published data [36][37][38][39][40][41] given by values H 0 = 3220 MPa and k H = 580 MPa·µm 1/2 . The data in Fig.…”

Section: Dislocation Density and The Hall-petch Relationshipmentioning

confidence: 99%

Microstructure, phase composition and hardness evolution in 316L stainless steel processed by high-pressure torsion

Gubicza

El-Tahawy

Huang

et al. 2016

Materials Science and Engineering: A

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show abstract

“…Texture analysis was carried out using electron backscatter diffraction (EBSD).The conventional steps were followed for EBSD measurement sample preparation. Fine polishing was done with a 0.25 µm, self-lubricating, properties of different materials have been thoroughly explained and discussed elsewhere [39][40][41][42]. As is well established the SPT shear stress (Ĳ) and the normalized displacement (į) are calculated using the following equations:…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

Thermal stability of an ultrafine-grained dual phase TWIP steel

Razmpoosh¹,

Zarei-Hanzaki²,

Haghdadi³

et al. 2015

Materials Science and Engineering: A

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“…The effect of grain size on the mechanical properties of ASSs has been studied so far . Misra et al studied the mechanical behavior of AISI 301LN austenitic steel with grain sizes in the range of 0.6 to 1.6 μm.…”

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.

120

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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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An investigation into the room temperature mechanical properties of nanocrystalline austenitic stainless steels

Cited by 51 publications

References 29 publications

Microstructure, phase composition and hardness evolution in 316L stainless steel processed by high-pressure torsion

Microstructure, phase composition and hardness evolution in 316L stainless steel processed by high-pressure torsion

Thermal stability of an ultrafine-grained dual phase TWIP steel

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

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