|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Additive Manufacturing: Building the Pathway towards Process and Material Qualification
||Microstructural Characterization of Functionally Graded Transition Joints between Dissimilar Metals Obtained with Laser-based Additive Manufacturing
||Ercan Cakmak, Niyanth Sridharan, Sudarsanam Suresh Babu, William H Peter, Ryan R Dehoff, Thomas R Watkins, David Gandy
|On-Site Speaker (Planned)
Design requirements for heat exchanger components in power generation boilers often require joining of dissimilar materials. These joints are typically formed between the less expensive ferritic low-alloys steels, in the low temperature region, and more expensive austenitic stainless steels, in the higher temperature region.
Two major problems arising from joining of dissimilar metals are the carbon migration from the low alloy steel to the austenitic steel and the mismatch between the coefficients of thermal expansion. By using a graded transition between two base metals these problems can be largely reduced.
Additive manufacturing using the laser-based DM3D technique holds potential for achieving such grading with precise control of alloy mixtures on each build layer. In this work, transition blocks were additively manufactured between low-alloy ferritic and austenitic stainless steels with IN82 grading material, using the DM3D process. Hardness testing, XRD, SEM and EBSD techniques were used for the characterization.
||Planned: A print-only volume