Friction Stir Welding of Dual Phase Steel


Friction stir welding (FSW) of a dual phase (DP590) steel was evaluated with a cemented carbide tool. Different tool traverse speeds at 1000 rpm tool rotation rate were employed to compare the microstructural changes (phase transformation, grain morphology, and grain size) and mechanical properties in the nugget region. Mechanical properties of the parent material and nugget regions were characterized by mini-tensile and microhardness tests. The yield strength and ductility increased in the nugget region after FSW. The weld efficiency was about 83% for a 1 inch per minute (ipm) run and over 90% for 2 ipm and 4 ipm runs. Microhardness was higher in the nugget than the base material, and the heat affected zone was the softest region. Detailed microstructural evolution and corresponding thermal history of various regions are compared and discussed.


Materials Science and Engineering

Keywords and Phrases

Dual Phase Steel; Mechanical Properties; Phase Transformation; Friction stir welding

Document Type

Article - Conference proceedings

Document Version


File Type





© 2009 The Minerals, Metals & Materials Society (TMS), All rights reserved.

Publication Date

01 Feb 2009

This document is currently not available here.