Surface nanocrystallization and gradient microstructural evolutions in the surface layers of 321 stainless steel alloy treated via severe shot peening.
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| Title: | Surface nanocrystallization and gradient microstructural evolutions in the surface layers of 321 stainless steel alloy treated via severe shot peening. |
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| Authors: | Pour-Ali, Sadegh1, Kiani-Rashid, Ali-Reza1 kianirashid@um.ac.ir, Babakhani, Abolfazl1 |
| Source: | Vacuum. Oct2017, Vol. 144, p152-159. 8p. |
| Subjects: | Nanocrystals, Microstructure, Steel alloys, Shot peening, Particle size distribution |
| Abstract: | The gradient nanocrystalline structure from the top surface to the subsurface layers of 321 austenitic stainless steel alloy was fabricated by means of severe shot peening. The microstructural evolutions including the grain size distribution and phase transformation were investigated in-depth. Experimental results showed that the dislocation slipping plays a key role in the grain refinement of this alloy and depend on the amount of imparted plastic strain, different structures including dislocation walls, dislocation tangles, mechanical twinning, lamella-shaped cells are sequentially appeared in the surface and/or subsurface grains. Due to imparting ultrahigh plastic deformation in the topmost surface, mentioned structures are converted to the nano-grains (68–82 nm) to minimize the total energy of the surface layer. In line with the grain refinement, austenite to strain induced martensite phase transformation is more affected as the plastic strain increases so that the volume fraction of latter phase reaches to 65% in the topmost surface. As a result of these evolutions, microhardness values are decreased from 281 to 120 HV in the surface layers. [ABSTRACT FROM AUTHOR] |
| Copyright of Vacuum is the property of Pergamon Press - An Imprint of Elsevier Science 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 |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 124933753 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Surface nanocrystallization and gradient microstructural evolutions in the surface layers of 321 stainless steel alloy treated via severe shot peening. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Pour-Ali%2C+Sadegh%22">Pour-Ali, Sadegh</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Kiani-Rashid%2C+Ali-Reza%22">Kiani-Rashid, Ali-Reza</searchLink><relatesTo>1</relatesTo><i> kianirashid@um.ac.ir</i><br /><searchLink fieldCode="AR" term="%22Babakhani%2C+Abolfazl%22">Babakhani, Abolfazl</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Vacuum%22">Vacuum</searchLink>. Oct2017, Vol. 144, p152-159. 8p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Nanocrystals%22">Nanocrystals</searchLink><br /><searchLink fieldCode="DE" term="%22Microstructure%22">Microstructure</searchLink><br /><searchLink fieldCode="DE" term="%22Steel+alloys%22">Steel alloys</searchLink><br /><searchLink fieldCode="DE" term="%22Shot+peening%22">Shot peening</searchLink><br /><searchLink fieldCode="DE" term="%22Particle+size+distribution%22">Particle size distribution</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The gradient nanocrystalline structure from the top surface to the subsurface layers of 321 austenitic stainless steel alloy was fabricated by means of severe shot peening. The microstructural evolutions including the grain size distribution and phase transformation were investigated in-depth. Experimental results showed that the dislocation slipping plays a key role in the grain refinement of this alloy and depend on the amount of imparted plastic strain, different structures including dislocation walls, dislocation tangles, mechanical twinning, lamella-shaped cells are sequentially appeared in the surface and/or subsurface grains. Due to imparting ultrahigh plastic deformation in the topmost surface, mentioned structures are converted to the nano-grains (68–82 nm) to minimize the total energy of the surface layer. In line with the grain refinement, austenite to strain induced martensite phase transformation is more affected as the plastic strain increases so that the volume fraction of latter phase reaches to 65% in the topmost surface. As a result of these evolutions, microhardness values are decreased from 281 to 120 HV in the surface layers. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Vacuum is the property of Pergamon Press - An Imprint of Elsevier Science 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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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.vacuum.2017.07.016 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 8 StartPage: 152 Subjects: – SubjectFull: Nanocrystals Type: general – SubjectFull: Microstructure Type: general – SubjectFull: Steel alloys Type: general – SubjectFull: Shot peening Type: general – SubjectFull: Particle size distribution Type: general Titles: – TitleFull: Surface nanocrystallization and gradient microstructural evolutions in the surface layers of 321 stainless steel alloy treated via severe shot peening. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Pour-Ali, Sadegh – PersonEntity: Name: NameFull: Kiani-Rashid, Ali-Reza – PersonEntity: Name: NameFull: Babakhani, Abolfazl IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 10 Text: Oct2017 Type: published Y: 2017 Identifiers: – Type: issn-print Value: 0042207X Numbering: – Type: volume Value: 144 Titles: – TitleFull: Vacuum Type: main |
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