Transient Thermal and Microstructural Analysis of Friction Welded Joints Made Between INCONEL 800 and AISI 304

Author T.Vigraman
Co-Author A.Vignesh, S.Sivaram, S.Siva, B.Gobalakrishnanan
DOI

Country : India
Subject : Engineering

Keywords : Friction welding; INCONEL 800; AISI 304; dissimilar weld; micrograph; tensile strength; ANSYS; thermal analysis

Abstract

Friction welding is a solid state welding process capable of joining similar and dissimilar material combinations. The Inconel 800 and AISI 304 stainless steel was friction welded at three rotational speeds 1300, 1400 and 1500 rpm, friction time was varied as 3, 4 and, 5 sec, friction pressure was maintained at 99.92, 124.9 and, 156.13 MPa, and forging pressure was kept at 156.13 MPa. The maximum tensile strength of the friction welded Inconel 800 and AISI 304 stainless steel was 548.3 MPa for the samples processed at a rotational speed of 1500 rpm, friction time 4sec, friction pressure of 99.2 MPa and a forging pressure of 156.13MPa. An inseparable well mixed plasticized zone with recrystallized zone was observed at the interface. The optical micrographs revealed the presence of austenite phase, along the grain boundaries fine spherical carbides and intermetallic compounds. The width of the plasticized and recrystallized zone at the interface was more for the annealing heat-treated samples. The temperature profile obtained after thermal analysis using ANSYS software had given a maximum temperature of 950°C and away from the interface at the edge of the base metals it was a minimum of 36.5 °C.

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