A national workshop organized Indian Institute of Metals

New Horizons in Metallurgy, Materials, and Manufacturing

A national workshop organized by Indian Institute of Metals
December 14th - 16th 2020

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Multiscale modeling in arc welding using secondary thermal cycle

avatar Prof. G. Phanikumar Professor, Metallurgical and Materials Engineering
IIT Madras
  • Bio

    Gandham Phanikumar has done his B.Tech in Metallurgical Engineering in 1996 from IIT Madras. He obtained his PhD on “Experimental and Computational Studies on Laser Processing of Dissimilar Metals” from Indian Institute of Science, Bangalore in 2002. He was a post-doctoral fellow at German Aerospace Centre, Cologne from 2002 to 2005 with a fellowship from BMBF and AvH foundation. He has been on the faculty of Department of Metallurgical and Materials Engineering, IIT Madras since 2005. He teaches courses on transport phenomena, thermodynamics of materials, advanced phase transformations, solidification and introduction to scientific computing . His research interests include ICME, Solidification, Welding and Additive Manufacturing.

  • Abstract

    Abstract: Arc welding involves thermal cycles that leads to phase transformations as well as residual stresses. Alloys that are designed to have specific microstructures obtained through thermomechanical treatment are prone to losing their properties in the fusion zone and heat affected zone. One can design a second thermal cycle in such a way as to reduce the residual stress or lead to phase transformations that can compensate for the loss of properties. Such studies require multiscale modeling involving welding at system scale as well as microtructural models. While there are models available for phase transformations, detailed modeling of microstructure evolution is necessary in alloys such as dual phase steels. In this lecture, two sets of examples are presented to illustrate the role of a second thermal cycle on reducing residual stresses and on predicting phase evolution.