Investigation into the influence of laser melting on the sulphide inclusions in AISI 416 stainless steel

► Laser surface treatment reduces sulphide inclusion size from over 2 μm to below 0.5 μm. ► Total volume of sulphur in stainless steel not reduced by laser surface treatment. ► Pitting potential in 500 ppm chloride increases by more than 200 mV. ► Inverse linear relationship between pitting potentia...

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Veröffentlicht in:Corrosion science 2011-12, Vol.53 (12), p.3950-3955
Hauptverfasser: Tan, Yong Teck, Wijesinghe, T.L. Sudesh L., Ng, Gary Ka Lai, Blackwood, Daniel J.
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container_end_page 3955
container_issue 12
container_start_page 3950
container_title Corrosion science
container_volume 53
creator Tan, Yong Teck
Wijesinghe, T.L. Sudesh L.
Ng, Gary Ka Lai
Blackwood, Daniel J.
description ► Laser surface treatment reduces sulphide inclusion size from over 2 μm to below 0.5 μm. ► Total volume of sulphur in stainless steel not reduced by laser surface treatment. ► Pitting potential in 500 ppm chloride increases by more than 200 mV. ► Inverse linear relationship between pitting potential and size sulphide inclusions. ► No Influence of Ar or N 2 shielding gas on pitting behavior. AISI 416 is a high sulphur martensitic stainless steel with elliptical shaped sulphide inclusions over 2 μm in length. After laser melting the sulphide inclusions became spherical and reduced in size to below 0.5 μm in diameter. SEM investigations showed that the total number of inclusions increased dramatically and it was calculated that the total volume of sulphur in the stainless steel had not changed during the laser treatment. The pitting potential was increased by over 200 mV with an inverse linear dependency on the average inclusion size. The frequency of metastable pitting events decreased by a factor of 100.
doi_str_mv 10.1016/j.corsci.2011.07.042
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subjects A. Stainless steel
Applied sciences
B. Polarization
B. Potential static
B. SEM
C. Pitting corrosion
C. Welding
Corrosion
Corrosion environments
Exact sciences and technology
Inclusions
Joining, thermal cutting: metallurgical aspects
Lasers
Melting
Metals. Metallurgy
Pitting (corrosion)
Production techniques
Stainless steels
Sulfides
Sulfur
Sulphur
Surface treatment
Welding
title Investigation into the influence of laser melting on the sulphide inclusions in AISI 416 stainless steel
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