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Effect of the Heat Input in the Mechanical and Metallurgical Properties of Welds on AHSS Transformed Induced Plasticity Steel Joined with GMAW Processes in the Automotive Industry

Published online by Cambridge University Press:  24 February 2014

Victor Lopez ,
Arturo Reyes  and
Patricia Zambrano
Victor Lopez*
Affiliation:
Corporación Mexicana de Investigación en Materiales S.A de C.V., calle ciencia y tecnología 790 Saltillo, México.
Arturo Reyes
Affiliation:
Corporación Mexicana de Investigación en Materiales S.A de C.V., calle ciencia y tecnología 790 Saltillo, México.
Patricia Zambrano
Affiliation:
Universidad Autónoma de Nuevo Leon, Pedro de Alba s/n San Nicolas N.L, México.
*
*Email: vlopez@comimsa.com
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Abstract

The effect of the heat input on the mechanical and metallurgical properties of the welds has been investigated in the heat affected zone (HAZ) of welds joined with gas metal arc welding (GMAW), using normal production welding parameters. The thermal effect in the HAZ of the welds is important for the optimization of the welding parameters used when weld transformed induced plasticity (TRIP) steels, because this will have a great influence in the mechanical and metallurgical properties of the weld. In this work 3 samples was welded a high, average and low heat input, with the variation of welding parameters to obtain different thermal affectation to investigate the variations in different parts of weld joint: weld, HAZ and base metal, due the heat applied for the welding process used. Mechanical properties were evaluated by tension test, microhardness and fatigue testing and metallurgical evaluation with optical metallograpy, scanning electron microscopy (SEM), fractograpy and X-Ray diffraction (XRD).The results obtained shows that the mechanical properties of the tension test decrease when the heat input increase and the microhardness exhibit a softening zone in the HAZ with lower hardness and the fatigue life were similar for all heat inputs for the high stress levels, but only in low stress there is a difference. For metallurgical properties the metallographic evaluation shows ferrite, bainite - martensite and retained austenite, and the fractography analysis exhibit a ductile fracture in all cases and the content in volume fraction of retained austenite increases in the HAZ of welds when increasing heat input in to the base metal due the thermal effect.

Keywords

joiningmicrostructurefatigue
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-o009
Copyright
Copyright © Materials Research Society 2014 

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