Ultrasound, eddy current and magnetic Barkhausen noise as tools for sigma phase detection on a UNS S31803 duplex stainless steel

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:527

Article

Normando, Paulo G.¹  Moura, Elineudo P.¹  Souza, Jose A.²  Tavares, Sergio S. M.²  Padovese, Linilson R.³ 

[1] Univ Fed Ceara, Dept Met & Mat Engn, BR-60455760 Fortaleza, Ceara, Brazil

[2] Univ Fed Fluminense, Dept Mech Engn, BR-24210240 Niteroi, RJ, Brazil

[3] Univ Sao Paulo, Dept Mech Engn, BR-05508900 Sao Paulo, Brazil

关键词: Duplex steel;    Heat treatment;    Phase transformation;    Nondestructive testing;   

DOI  :  10.1016/j.msea.2010.01.017

来源: Elsevier

【 摘 要 】

Sigma phase is a deleterious one which can be formed in duplex stainless steels during heat treatment or welding. Aiming to accompany this transformation, ferrite and sigma percentage and hardness were measured on samples of a UNS S31803 duplex stainless steel submitted to heat treatment. These results were compared to measurements obtained from ultrasound and eddy current techniques, i.e., velocity and impedance, respectively. Additionally, backscattered signals produced by wave propagation were acquired during ultrasonic inspection as well as magnetic Barkhausen noise during magnetic inspection. Both signal types were processed via a combination of detrended-fluctuation analysis (DFA) and principal component analysis (PCA). The techniques used were proven to be sensitive to changes in samples related to sigma phase formation due to heat treatment. Furthermore, there is an advantage using these methods since they are nondestructive. (C) 2010 Elsevier B.V. All rights reserved.

【 授权许可】

Free