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

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.

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ACKNOWLEDGMENT

The authors are thankful to Shri. A.K. Mishra, DGM, RMFA; Shri. Roy M. Cherian, GM, EFA and Dr. P.V. Venkitakrishnan, DD, MME for their support throughout the studies. Thanks to Dr. M.R. Suresh, OLV for his guidance and support to review this paper. Also the authors are thankful to M/s Ramakrishna Engineering Company, Chennai for providing fabrication facility to carry out this investigation.

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Correspondence to P. Sathiya.

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Srinivasan, L., Kannan, T.D.B., Sathiya, P. et al. Effect of heat input, heat treatment on microstructure and mechanical properties of GTA welded aerospace material 15CDV6. Journal of Materials Research 32, 1361–1366 (2017). https://doi.org/10.1557/jmr.2017.70

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