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Correlation between the surface coverage of severe shot peening and surface microstructural evolutions in AISI 321: A TEM, FE-SEM and GI-XRD study.

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Title: Correlation between the surface coverage of severe shot peening and surface microstructural evolutions in AISI 321: A TEM, FE-SEM and GI-XRD study.
Authors: Pour-Ali, Sadegh1, Kiani-Rashid, Ali-Reza1 kianirashid@um.ac.ir, Babakhani, Abolfazl1, Virtanen, Sannakaisa2, Allieta, Mattia3
Source: Surface & Coatings Technology. Jan2018, Vol. 334, p461-470. 10p.
Subjects: Austenitic stainless steel, Grain size, Microstructure, Material plasticity, Particle size distribution, Grain refinement
Abstract: Severe shot peening (SSP) as a surface severe plastic deformation (S 2 PD) process over a wide range of coverages was applied to generate gradient microstructures with the grain size increasing from nanometer- and micron-scale to initial grain size on the surface layers of 321 stainless steel. The microstructural evolutions including the grain size distribution and phase transformation were systematically investigated in-depth for different surface coverages. GI-XRD, FE-SEM and TEM techniques were used to reveal the microstructure modification mechanisms as a function of the surface coverage. Experimental results show that dislocation slip plays a key role in the grain refinement of this alloy so that with increasing the surface coverage, different structures including dislocation walls, dislocation tangles, and lamella-shaped cells sequentially appear in the initial coarse grains. The results confirmed that these dense dislocation structures during ultrahigh plastic deformation produce ultrafine- (115–192 nm) and nano-grains (68–82 nm) to minimize the total energy of the system. In line with the grain refinement, the γ (austenite) → α ′ (straininduced martensite) phase transformation is more affected as the plastic strain increases. So that the volume fraction of α ′ phase increases to 58.4% for ultrahigh strains. Gradient variation of microhardness with the depth was also obtained for various samples. [ABSTRACT FROM AUTHOR]
Copyright of Surface & Coatings Technology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 126945015
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Correlation between the surface coverage of severe shot peening and surface microstructural evolutions in AISI 321: A TEM, FE-SEM and GI-XRD study.
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  Data: <searchLink fieldCode="JN" term="%22Surface+%26+Coatings+Technology%22">Surface & Coatings Technology</searchLink>. Jan2018, Vol. 334, p461-470. 10p.
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  Data: <searchLink fieldCode="DE" term="%22Austenitic+stainless+steel%22">Austenitic stainless steel</searchLink><br /><searchLink fieldCode="DE" term="%22Grain+size%22">Grain size</searchLink><br /><searchLink fieldCode="DE" term="%22Microstructure%22">Microstructure</searchLink><br /><searchLink fieldCode="DE" term="%22Material+plasticity%22">Material plasticity</searchLink><br /><searchLink fieldCode="DE" term="%22Particle+size+distribution%22">Particle size distribution</searchLink><br /><searchLink fieldCode="DE" term="%22Grain+refinement%22">Grain refinement</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Severe shot peening (SSP) as a surface severe plastic deformation (S 2 PD) process over a wide range of coverages was applied to generate gradient microstructures with the grain size increasing from nanometer- and micron-scale to initial grain size on the surface layers of 321 stainless steel. The microstructural evolutions including the grain size distribution and phase transformation were systematically investigated in-depth for different surface coverages. GI-XRD, FE-SEM and TEM techniques were used to reveal the microstructure modification mechanisms as a function of the surface coverage. Experimental results show that dislocation slip plays a key role in the grain refinement of this alloy so that with increasing the surface coverage, different structures including dislocation walls, dislocation tangles, and lamella-shaped cells sequentially appear in the initial coarse grains. The results confirmed that these dense dislocation structures during ultrahigh plastic deformation produce ultrafine- (115–192 nm) and nano-grains (68–82 nm) to minimize the total energy of the system. In line with the grain refinement, the γ (austenite) → α ′ (straininduced martensite) phase transformation is more affected as the plastic strain increases. So that the volume fraction of α ′ phase increases to 58.4% for ultrahigh strains. Gradient variation of microhardness with the depth was also obtained for various samples. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Surface & Coatings Technology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Text: English
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      – SubjectFull: Grain size
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      – SubjectFull: Microstructure
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      – SubjectFull: Material plasticity
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              Text: Jan2018
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