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Weldability of High-Mn Austenitic Twinning-Induced Plasticity (TWIP) Steel Microalloyed with Nb

Published online by Cambridge University Press:  31 January 2018

I. Mejía ,
H. Hernández-Belmontes  and
C. Maldonado
I. Mejía*
Affiliation:
Instituto de Investigaciones Metalúrgicas, Universidad Michoacana de San Nicolás de Hidalgo. Edificio “U-5”, Ciudad Universitaria, 58066-Morelia, Michoacán, México. E-mail: [email protected]
H. Hernández-Belmontes
Affiliation:
Instituto de Investigaciones Metalúrgicas, Universidad Michoacana de San Nicolás de Hidalgo. Edificio “U-5”, Ciudad Universitaria, 58066-Morelia, Michoacán, México. E-mail: [email protected]
C. Maldonado
Affiliation:
Instituto de Investigaciones Metalúrgicas, Universidad Michoacana de San Nicolás de Hidalgo. Edificio “U-5”, Ciudad Universitaria, 58066-Morelia, Michoacán, México. E-mail: [email protected]
*
*(Email: [email protected])
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Abstract

The objective of this research work is to study the weldability of a Nb microalloyed TWIP steel through welding nuggets generated by Gas Tungsten Arc Welding process. Weldability was examined by microstructural changes in the fusion zone (FZ) and heat affected zone (HAZ) using light optical metallography (LOM), segregation in the nuggets was evaluated using elemental mappings of chemical analysis by Scanning Electron Microscopy and Electron Dispersive Spectroscopy (SEM-EDS), phase transformations were evaluated using X-ray diffraction (XRD) and the hardness properties were examined using Vickers microhardness testing (HV25). Experimental results show that microstructure of welding nuggets consists of austenitic dendritic grains in the FZ and equiaxed grains in the HAZ. FZ width and HAZ grain growth tend to increase as the heat input increases. Additionally, the studied Nb-containing TWIP steel showed segregation in the FZ, where Mn and Si segregated in the interdendritic regions, while Al and C preferentially segregated in dendritic areas. In general, the data obtained by XRD indicated that GTAW process did not affect austenite stability. Finally, the welding nuggets of studied TWIP steel showed lower microhardness values than the as-solution condition (starting condition). However, the heat affected zone showed hardened areas, which are associated with NbC precipitation hardening.

Keywords

steelweldingNb
Type
Articles
Information
MRS Advances , Volume 2 , Issue 62: International Materials Research Congress XXVI , 2017 , pp. 3899 - 3908
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Copyright
Copyright © Materials Research Society 2018 

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