Induced magnetic field used to detect the sigma phase of a 2205 duplex stainless steel

• Type: Article in International Scientific Journal
• Date: 2016

Authors

Edgard de Macedo Silva (Author) Other; Josinaldo Pereira Leite (Author) Other; João Pereira Leite (Author) Other; Walter Macedo Lins Fialho (Author) Other; Victor Hugo C. de Albuquerque (Author) Other; João Manuel R. S. Tavares (Author) FEUP

Journal

Title: Journal of Nondestructive Evaluation

Vol. 35 No. 2

Pages: 1-10

ISSN: 0195-9298

Publisher: Springer Nature

Indexing

ISI Web of Knowledge - 3 Citations

ISI Web of Science

Scopus - 6 Citations

INSPEC

Scientific classification

CORDIS: Technological sciences

FOS: Engineering and technology

Other information

Authenticus ID: P-00K-BT4

DOI: 10.1007/s10921-016-0339-7

Abstract (EN): Sigma phases are formed due to heat treatments and/or welding processes during the solidification stage, and they are responsible for embrittlement of duplex stainless steels. Only a small amount of this phase promotes unfavorable mechanical properties and liability to corrosion. In this work, a new affordable approach to detect and follow-up the kinetics of the sigma phase transformation is evaluated. The measurements are based on an induced magnetic field generated through the interaction between an external magnetic field and themicrostructure under study. To validate this approach, the induced magnetic field values are compared with the values of the Charpy impact energy, and the sigma phase is assessed by optical microscopy. Moreover, surface fractures are analyzed by scanning electron microscopy and X-ray diffraction. The results from the 2205 duplex stainless steel used showthat there is a direct relation among the impact energy, fracture mechanism and induced magnetic field. The method proved to be able to follow up the embrittlement of the DSS successfully. Moreover, the results confirm that the presence of a sigma phase can be studied based on an induced magnetic field, even when in low amounts, and that a critical threshold value can be defined to monitor structures in service.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 10