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Microstructural Characterization by Color Tint Etching of a TRIP-800 Steel Welded by Laser CO2 Process.

Published online by Cambridge University Press:  29 February 2012

G.Y. Pérez-Medina ,
P. Zambrano ,
H.F. López ,
F.A. Reyes-Valdés  and
V H. López-Cortés
G.Y. Pérez-Medina
Affiliation:
Corporación Mexicana de Investigación en Materiales Calle Ciencia y Tecnología #790, Fracc. Saltillo 400, Saltillo, Coah. México 25290
P. Zambrano
Affiliation:
Universidad Autónoma de Nuevo León. Facultad de Ingeniería Mecánica y Eléctrica. Av. Pedro de Alba S/N. Col Ciudad Universitaria. San Nicolás de los Garza Nuevo León.
H.F. López
Affiliation:
Corporación Mexicana de Investigación en Materiales Calle Ciencia y Tecnología #790, Fracc. Saltillo 400, Saltillo, Coah. México 25290
F.A. Reyes-Valdés
Affiliation:
Corporación Mexicana de Investigación en Materiales Calle Ciencia y Tecnología #790, Fracc. Saltillo 400, Saltillo, Coah. México 25290
V H. López-Cortés
Affiliation:
Corporación Mexicana de Investigación en Materiales Calle Ciencia y Tecnología #790, Fracc. Saltillo 400, Saltillo, Coah. México 25290
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Abstract

This paper presents results on the impact of Laser CO2 process variables on the weldability, phase transformations and exhibited tensile properties in a TRIP800 Steel. The microstructures of this steel consist of ferrite, bainite, martensite, and substantial amount of retained austenite, which is obtained by controlled cooling from the intercritical anneling temperature to the isothermal bainitic holding temperature. These steel has been increasingly used in the last 10 years in the automotive industries and for these materials to be used effectively, the influence of material and the Laser CO2 process condition must be clearly understood. Hence, in this work the effect of the welding process on the resultant microstructures and on the exhibited mechanical properties was investigated. Color tint etching applied in welded for AHSS help us to know the phase transformation, the colors of each phase viewed under the microscopy. The weld was etching with Klemm´s 1 solution, in this work; it was found that the bainite is clearly identify by blue color, the martensite brown, yellow ferrite and the retained austenite white. Additional X ray Diffraction (XRD) is employed in characterization to estimate the quantity of retained austenite.

Keywords

x-ray diffraction (XRD)LaserMicrostructure
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1381: Symposium S22 – Materials Welding and Joining Technologies , 2012 , imrc11-1381-S22-009
Copyright
Copyright © Materials Research Society 2012

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References

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