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IJSTR >> Volume 4 - Issue 8, August 2015 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Ultrasonic Characterization And Micro-Structural Studies On 2205 Duplex Stainless Steel In Thermal Variations

[Full Text]



Bernice Victoria, Dr. Gene George, Kevin Ark Kumar



Index Terms: duplex steel, heat treatment, hygienic applications, microstructure, nondestructive, SAF, ultrasonic.



Abstract: Due to increasing concern on potential impact of materials on human health and environment, the materials used in hygienic applications should be durable, corrosion resistant, clean surface etc. Type 2205 duplex stainless steel is a preferred material for use in biomedical, pharmaceutical, nuclear pressure vessels, chemical tankers etc., it exhibits good mechanical strength and high resistance to corrosion. The strength, toughness, hardness of such materials are usually determined by destructive tests. However continuous destructive measurements are generally difficult to perform during the productive process, which creates a need for a fast and easy nondestructive method of material characterization. Microstructural changes in duplex stainless steel due to changes in annealing temperature are characterized by ultrasonic pulse –echo technique and optical microscopy. Type 2205 duplex stainless steel are heat treated at 1000 deg C, 1050 deg C, 1100 deg C, 1150 deg C and 1200 deg C for 15 min and water quenched. There is an appreciable change in the morphology of all the heat treated samples, and the ultrasonic velocity is dependent on both ferrite and austenite ratio and the grain size.



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