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Thermal stability of nanocrystalline surface layer of AISI 321 stainless steel.

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Title: Thermal stability of nanocrystalline surface layer of AISI 321 stainless steel.
Authors: Pour-Ali, Sadegh1, Kiani-Rashid, Ali-Reza1, Babakhani, Abolfazl1, Virtanen, Sannakaisa2
Source: Vacuum. Dec2017, Vol. 146, p297-303. 7p.
Subjects: Vacuum, Annealing of metals, Austenitic stainless steel, Grain growth, Crystal grain boundaries, Nanocrystals
Abstract: A nanocrystalline layer with an average grain size of 75 nm was formed on the top surface layer of 321 stainless steel (321SS) alloy via severe shot peening (SSP). Grazing incidence X-ray diffraction (GI-XRD) and transmission electron microscopy (TEM) were applied to characterize the grain size changes, phase compositions and microstructure evolution after vacuum annealing at temperatures ranging from 200 °C to 1000 °C. The results revealed that nanograins slowly grow to ≈411 nm as the temperature increases to 600 °C. Dislocation annihilation is shown to be responsible for the changes in grain size up to 600 °C. However, an abnormal grain growth is observed at annealing temperatures of 800 °C and 1000 °C in which grains grow to ≈1267 nm and ≈2012 nm, respectively. This abnormal grain growth is attributed to the synergistic effect of dislocation annihilation in grain boundaries and triple points, re-arrangement of dislocations, and formation of middle angle (13°–17°) grain boundaries. Transformation of stress induced martensite (α′) to austenite (γ) and microhardness evolution in the nanocrystalline top surface layer during annealing are also discussed. [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.)
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DbLabel: Engineering Source
An: 126041060
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  Data: A nanocrystalline layer with an average grain size of 75 nm was formed on the top surface layer of 321 stainless steel (321SS) alloy via severe shot peening (SSP). Grazing incidence X-ray diffraction (GI-XRD) and transmission electron microscopy (TEM) were applied to characterize the grain size changes, phase compositions and microstructure evolution after vacuum annealing at temperatures ranging from 200 °C to 1000 °C. The results revealed that nanograins slowly grow to ≈411 nm as the temperature increases to 600 °C. Dislocation annihilation is shown to be responsible for the changes in grain size up to 600 °C. However, an abnormal grain growth is observed at annealing temperatures of 800 °C and 1000 °C in which grains grow to ≈1267 nm and ≈2012 nm, respectively. This abnormal grain growth is attributed to the synergistic effect of dislocation annihilation in grain boundaries and triple points, re-arrangement of dislocations, and formation of middle angle (13°–17°) grain boundaries. Transformation of stress induced martensite (α′) to austenite (γ) and microhardness evolution in the nanocrystalline top surface layer during annealing are also discussed. [ABSTRACT FROM AUTHOR]
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  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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      – Type: doi
        Value: 10.1016/j.vacuum.2017.09.053
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      – Code: eng
        Text: English
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        PageCount: 7
        StartPage: 297
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      – SubjectFull: Vacuum
        Type: general
      – SubjectFull: Annealing of metals
        Type: general
      – SubjectFull: Austenitic stainless steel
        Type: general
      – SubjectFull: Grain growth
        Type: general
      – SubjectFull: Crystal grain boundaries
        Type: general
      – SubjectFull: Nanocrystals
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      – TitleFull: Thermal stability of nanocrystalline surface layer of AISI 321 stainless steel.
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            NameFull: Pour-Ali, Sadegh
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            NameFull: Kiani-Rashid, Ali-Reza
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            NameFull: Babakhani, Abolfazl
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            NameFull: Virtanen, Sannakaisa
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            – D: 01
              M: 12
              Text: Dec2017
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              Y: 2017
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