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Characterization of Microstructural Susceptibility by Color Tint Etching in a Friction Stir Welded Trip-780 Steel

Published online by Cambridge University Press:  24 February 2014

G.Y. Perez-Medina ,
P. Zambrano ,
F.A. Reyes-Valdés  and
H.F. López
G.Y. Perez-Medina*
Affiliation:
Corporación Mexicana de Investigación en Materiales. Saltillo, Coah. México.
P. Zambrano
Affiliation:
Universidad Autónoma de Nuevo León. FIME. San Nicolás de los Garza Nuevo León.México.
F.A. Reyes-Valdés
Affiliation:
Corporación Mexicana de Investigación en Materiales. Saltillo, Coah. México.
H.F. López
Affiliation:
Materials Department, University of Wisconsin-Milwaukee, Milwaukee WI 53201, USA
*
*Email: gladysperez@comimsa.com
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Abstract

The effect of friction stir welding (FSW) on the resultant microstructures in the welded nugget (WN), thermo-mechanically affected zone (TMAZ), heat affected zone (HAZ) and base metal (BM) of a TRIP-780 steel was investigated in this work. Color tint etching was used in the welded regions to disclose the exhibited microstructural constituents. In addition, significant fine grain size material was found in the WN regions. It was found that is considered to have experienced severe plastic deformation due to interaction with the welding tool pin lead to a drop in mechanical properties. Lap shear tensile testing indicated that the steel shear tension strength in the welded condition dropped compared with the BM. Microhardness profiles of the welded regions indicated that the hardness in both the WN and TMAZ were relatively elevated suggesting the development of martensite in these regions. In particular, the WN was found to shear fracture with uniformly distributed elongation shear dimples.

Keywords

x-ray diffractionsteelscanning electron microscopy
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1616: Symposium S5C – Structural and Chemical Characterization of Metals, Alloys, and Compounds - 2013 , 2014 , imrc2013-s5c-o006
Copyright
Copyright © Materials Research Society 2014 

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References

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