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Heat Input Effect on the Microstructure of Twinning-Induced Plasticity (TWIP) Steel Welded Joints Through the GTAW Process

Published online by Cambridge University Press:  05 November 2018

H. Hernández-Belmontes ,
I. Mejía ,
V. García-García  and
C. Maldonado
H. Hernández-Belmontes
Affiliation:
Departamento de Metalurgia Mecánica, Instituto de Investigación en Metalurgia y Materiales, Universidad Michoacana de San Nicolás de Hidalgo, Edificio “U-3” Ciudad Universitaria, 58030 Morelia, Michoacán, México. E-mail: monsches886@gmail.com, imejia@umich.mx
I. Mejía*
Affiliation:
Departamento de Metalurgia Mecánica, Instituto de Investigación en Metalurgia y Materiales, Universidad Michoacana de San Nicolás de Hidalgo, Edificio “U-3” Ciudad Universitaria, 58030 Morelia, Michoacán, México. E-mail: monsches886@gmail.com, imejia@umich.mx
V. García-García
Affiliation:
Departamento de Metalurgia Mecánica, Instituto de Investigación en Metalurgia y Materiales, Universidad Michoacana de San Nicolás de Hidalgo, Edificio “U-3” Ciudad Universitaria, 58030 Morelia, Michoacán, México. E-mail: monsches886@gmail.com, imejia@umich.mx
C. Maldonado
Affiliation:
Departamento de Soldadura, Instituto de Investigación en Metalurgia y Materiales, Universidad Michoacana de San Nicolás de Hidalgo, Edificio “U-3” Ciudad Universitaria, 58030 Morelia, Michoacán, México
*
*(Email: i.mejia.granados@gmail.com)
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Abstract

High-Mn Twinning Induced Plasticity (TWIP) steels are an excellent alternative in the design of structural components for the automotive industry. The TWIP steels application allows weight reduction, maintaining the performance of vehicles. Nowadays the research works focused on TWIP steel weldability are relative scarce. It is well-known that weldability is one of the main limitations for industrial application of TWIP steel. The main goal of this research work was studied the effect of heat input on the microstructural changes generated in a TWIP steel microalloyed with Ti. A pair of welds were performed through Gas Tungsten Arc Welding (GTAW) process. The GTAW process was carried out without filler material, using Direc Current Electrode Negative (DCEN), tungsten electrode EWTh-2 and Ar as shielding gas. The microstructure and average grain size in the fusion (FZ) and heat affected zone (HAZ) were determined by light optical metallography (LOM). Elements segregation in the FZ was evaluated using point and elemental mapping chemical analysis (EPMA) by Scanning Electron Microscopy and Electron Dispersive Spectroscopy (SEM-EDS). Phase transformations were evaluated using X-ray diffraction (XRD). Finally, the hardness were measured by means of Vickers microhardness testing (HV500). The results show that the FZ is characterized by a dendritic solidification pattern. Meanwhile, the HAZ presented equiaxed grains in both weld joints. On the other hand, the TWIP-Ti steel weldments did not present austenite phase transformations. Nevertheless, the FZ exhibited variations in the chemical elements distribution (Mn, Al, Si and C), which were higher as the heat input increases. Finally, the heat input reduced the microhardness of TWIP-Ti steel weld joints. Although post-welding hardness recovery was detected, which is associated with precipitation of Ti second-phase particles.

Keywords

steelweldingmicrostructurescanning electron microscopy (SEM)x-ray diffraction (XRD)
Type
Articles
Information
MRS Advances , Volume 3 , Issue 64: International Materials Research Congress XXVII , 2018 , pp. 3949 - 3956
Copyright
Copyright © Materials Research Society 2018 

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