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Deformation, microstructure, hardness, and pitting corrosion of 316 stainless steel after laser forming: A comparison between natural and forced cooling

Published online by Cambridge University Press:  02 May 2017

Morteza Chinizadeh  and
Seyed Rahim Kiahosseini
Morteza Chinizadeh
Affiliation:
Department of Engineering, Damghan Branch, Islamic Azad University, Damghan 3671639998, Iran
Seyed Rahim Kiahosseini*
Affiliation:
Department of Engineering, Damghan Branch, Islamic Azad University, Damghan 3671639998, Iran
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Sheets made of 316 stainless steel (100 × 100 × 1 mm3) were irradiated by laser at 1, 5, 10, and 15 passes under natural and forced cooling. Results showed that the deflection angle increased with the number of radiation passes. The bending angle after 15 passes of exposure under forced cooling was 5° higher than under natural cooling. The grain size under natural cooling increased from approximately 23–35 μm. By contrast, under forced cooling, the grain size decreased from approximately 37–27 μm. The sample hardness declined under natural cooling from approximately 212–200 HV. By contrast, sample hardness increased from approximately 216–233 HV under forced cooling. Polarization results show that the breakdown potential versus the number of lasing passes increased from −0.14 to −0.08 V under natural cooling and −0.16 to −0.06 V under forced cooling.

Keywords

lasermicrostructurethermal stresses
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 16 , 28 August 2017 , pp. 3046 - 3054
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Jürgen Eckert

References

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