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Effect of heat input, heat treatment on microstructure and mechanical properties of GTA welded aerospace material 15CDV6

Published online by Cambridge University Press:  07 March 2017

L. Srinivasan ,
T. Deepan Bharathi Kannan ,
P. Sathiya  and
S. Biju
L. Srinivasan
Affiliation:
Department of Production Engineering, National Institute of Technology, Thiruchirapalli-620015, Tamilnadu, India
T. Deepan Bharathi Kannan
Affiliation:
Department of Production Engineering, National Institute of Technology, Thiruchirapalli-620015, Tamilnadu, India
P. Sathiya*
Affiliation:
Department of Production Engineering, National Institute of Technology, Thiruchirapalli-620015, Tamilnadu, India
S. Biju
Affiliation:
Vikram Sarabhai Space Centre, ISRO, Thiruvananthapuram 695022, Kerala, India
*
a) Address all correspondence to this author. e-mail: psathiya@nitt.edu
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Abstract

In the present study, the effect of heat treatment on microstructure and mechanical properties of gas tungsten arc (GTA) welded 15CDV6 high strength low alloy steel is discussed. Experiments were carried out based on Taguchi L9 orthogonal array to weld 15CDV6 plate of thickness 3.7 mm. The input parameters considered in this work were current, voltage, and welding speed. Tensile strength, microhardness, and impact strength were measured as performance characteristics. Post weld heat treatment was carried out on the weldments to study its effect on the properties of weldments and microstructures were characterized using optical microscope and the X-ray diffraction analysis revealed the presence of MO2C and VC precipitates in the weld. Post weld heat treatment of the GTA welded samples and base metal successfully produced properties required for aerospace applications.

Keywords

15 CDV6TIG weldingmicrostructuretoughness

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Type
Articles
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Journal of Materials Research , Volume 32 , Issue 7 , 14 April 2017 , pp. 1361 - 1366
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Jürgen Eckert

References

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