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

查看全文 作　　者：Saju [1]T.Abraham;[1]S.K.Albert;[1]C.R.Das;[1]N.Parvathavarthini;[1]B.Venkatraman;[2]R.S.Mini;[3]K.Balasubramaniam

机构地区：[1]Quality Assurance Division, Indira Gandhi Centre for Atomic Research;[2]Department of Mechanical Engineering,Government Engineering College;[3]Department of Mechanical Engineering, Indian Institute of Technology

出　　处：《Acta Metallurgica Sinica(English Letters)》索引2013年第26卷第5期,共8页

摘　　要：A nonlinear ultrasonic technique has been developed to evaluate sensitization in Type 304 stainless steel.In order to achieve diferent 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. 关键词：非线性参数 304不锈钢超声法 AISI 评估 304型不锈钢超声技术 ASTM标准

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

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