Assessment of Sensitization in AISI 304 Stainless Steel by Nonlinear Ultrasonic Method

doi:10.1007/s40195-013-0168-y

Abstract

Abstract:

A nonlinear ultrasonic technique has been developed to evaluate sensitization in Type 304 stainless steel. In order to achieve different degree of sensitization (DOS), specimens have been subjected to heat treatment at 675℃ at varying soaking time (0.5, 1.0, 2.0, 3.0 and 4.0 h). Heat treated specimens were subjected to intergranular corrosion tests as per ASTM standards A262 and G108. Sensitization in longer soaked material has been confirmed through ditch microstructures, cracks on the bend tested specimens and higher degree of sensitization. Nonlinear ultrasonic studies showed variation in the nonlinearity parameter with soaking time which also confirms sensitization. A good correlation was observed between the degree of sensitization measured by the electrochemical potentiokinetic reactivation test and the ultrasonic nonlinearity parameter. This study clearly demonstrated that nonlinear ultrasonic technique can be used as a potential technique for non-destructive characterization of sensitization in austenitic stainless steel.

Key words: Austenitic stainless steel, Degree of sensitization, Intergranular Corrosion, Nonlinear ultrasonics

Saju T. Abraham, S.K.Albert, C.R. Das, N. Parvathavarthini, B. Venkatraman, R.S. Mini, K.Balasubramaniam. Assessment of Sensitization in AISI 304 Stainless Steel by Nonlinear Ultrasonic Method[J]. Acta Metallurgica Sinica (English Letters), DOI: 10.1007/s40195-013-0168-y.

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