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Physical simulation of friction stirs welding on duplex stainless steels

Grant number: 11/04889-7
Support type:Scholarships in Brazil - Master
Effective date (Start): August 01, 2011
Effective date (End): March 31, 2013
Field of knowledge:Engineering - Materials and Metallurgical Engineering - Transformation Metallurgy
Principal Investigator:Antonio José Ramirez Londono
Grantee:Eduardo Bertoni da Fonseca
Home Institution: Centro Nacional de Pesquisa em Energia e Materiais (CNPEM). Ministério da Ciência, Tecnologia, Inovações e Comunicações (Brasil). Campinas , SP, Brazil

Abstract

This project aims to implement the physical simulation of friction stir welding (FSW) on UNS S32750 duplex stainless steel using a thermomechanical simulator. FSW is a solid state joining process proposed in 1991 by The Welding Institute in United Kingdom, which allies a range of technical and economic advantages over fusion welding.FSW has been mainly studied and used on low melting point alloys, such as Al and Mg alloys, especially for aerospace and transportation industries. Nevertheless, joining higher melting point materials like copper, iron and nickel has been proven to be feasible although technology is still under development. A thermo-mechanical simulator Gleeble 3800®, recently installed at the Brazilian Light Synchrotron Laboratory (LNLS), will be employed to simulate thermomechanical conditions to which materials are subjected during FSW. Experimental data such as strain rates and their effects on sample heating are nowadays unknown, but can be obtained from physical simulations. This information is essential for the reliable implementation of FSW computational simulation. Physical simulation of FSW microstructures was firstly proposed by Prof. John Lippold in 2006. The objective of this work is to implement this technique at LNLS and apply it to study super duplex stainless steel for the first time.Besides microstructure comparisons, this project will evaluate resemblances quantitatively throughout optical and scanning electron microscopy and micro-texture measures using high definition EBSD. Microstructure analysis will be supported by metal forming theory. Actual super duplex stainless steel UNS S32750 friction stir welds have been already produced at LNLS and their detail characterization is ongoing as a part of a Ph.D. thesis. The team involved in this project has remarkable experience in physical metallurgy and joining of duplex stainless steel, physical simulation, friction stir welding of high melting temperature alloys (including duplex stainless steels) and metal forming. (AU)

Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
FONSECA, Eduardo Bertoni da. Physical simulation of UNS S32205 duplex stainless steel friction stir welding. 2013. Master's Dissertation - Universidade Estadual de Campinas (UNICAMP). Faculdade de Engenharia Mecânica.

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