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Paper Abstract and Keywords
Presentation 2020-12-25 15:05
Effect of martensitic transformation rate on local corrosion of stainless steel
Yuta Yagi (NAKABOHTEC), Hiroki Ichikawa, Kazuhiko Noda (SIT), Yoshimi Watanabe (NIT) OME2020-11 Link to ES Tech. Rep. Archives: OME2020-11
Abstract (in Japanese) (See Japanese page) 
(in English) Austenitic stainless steels have high corrosion resistance, but are low strength. So, they have a limited range of use for structural material. Accordingly, a martensitic phase-introduced stainless steel with high strength has been developed. Although the introduction of the martensite phase improves the strength, there is a risk that the corrosion resistance is reduced. Therefore, in this study, it was investigated that the local corrosion of martensitic phase-introduced austenitic stainless steel. At First, the polarization curves of SUS304 with different martensite phase introduction rates (transformation rates) were measured in neutral NaCl solution. As a result, it was found that the introduction of the martensite phase did not affect the pitting potential (occurrence of pitting corrosion). Secondly, specimens with different martensitic rates were polarized at constant current in neutral NaCl solution to investigate the growth of pitting corrosion. As a result, as the martensitic rate increased, small size pitting corrosion decreased and large size pitting corrosion increased. So, the martensite phase affects the growth of pitting corrosion. Finally, in order to investigate the effect of martensite phase on growth of pitting corrosion, specimens with different martensitic rates were polarized at constant potential in acidic NaCl solution simulated the inside of pit. As a result, in a low pH environment, in the case that martensite transformation rate increases, the amount of dissolution increases even in the passive region. It is considered that dissolution is increased inside the pit, and pitting corrosion grows in the case of high martensitic rate.
Keyword (in Japanese) (See Japanese page) 
(in English) Stainless steel / Functionally graded material / Martensitic transformation / Pitting corrosion / / / /  
Reference Info. IEICE Tech. Rep., vol. 120, no. 307, OME2020-11, pp. 18-22, Dec. 2020.
Paper # OME2020-11 
Date of Issue 2020-12-18 (OME) 
ISSN Online edition: ISSN 2432-6380
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All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Committee OME  
Conference Date 2020-12-25 - 2020-12-26 
Place (in Japanese) (See Japanese page) 
Place (in English) Okinawaken Seinen Kaikan 
Topics (in Japanese) (See Japanese page) 
Topics (in English) bio-technology, surface and interfacial phenomena, measurement and observation, electronics, and other researches relating these 
Paper Information
Registration To OME 
Conference Code 2020-12-OME 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Effect of martensitic transformation rate on local corrosion of stainless steel 
Sub Title (in English)  
Keyword(1) Stainless steel  
Keyword(2) Functionally graded material  
Keyword(3) Martensitic transformation  
Keyword(4) Pitting corrosion  
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1st Author's Name Yuta Yagi  
1st Author's Affiliation NAKABOHTEC CORROSION PROTECTING CO., LTD. (NAKABOHTEC)
2nd Author's Name Hiroki Ichikawa  
2nd Author's Affiliation Shibaura Institute of Technology (SIT)
3rd Author's Name Kazuhiko Noda  
3rd Author's Affiliation Shibaura Institute of Technology (SIT)
4th Author's Name Yoshimi Watanabe  
4th Author's Affiliation Nagoya Institute of Technology (NIT)
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Speaker Author-1 
Date Time 2020-12-25 15:05:00 
Presentation Time 25 minutes 
Registration for OME 
Paper # OME2020-11 
Volume (vol) vol.120 
Number (no) no.307 
Page pp.18-22 
#Pages
Date of Issue 2020-12-18 (OME) 


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