Microstructure Characteristic of TiCReinforced Cast Steel after GTAW Remelting

Open access


In this study, low-carbon cast steel was reinforced with TiC by SHS-B method, also known as combustion synthesis during casting method. The composite zone was then subjected to surface remelting by Gas Tungsten Arc Welding (GTAW) method. The remelting operation was realized manually, at 150 A current magnitude. Microstructure, phase composition and hardness of remelted zone were investigated. XRD results reveal that the phases of the composite zone in initial state consist of TiC and Feα. Surface remelting resulted in formation of thick layers containing TiC carbides, Feα and Feγ. Microstructural examination has shown strong refinement of titanium carbides in remelted zone and complete dissolution of primary titanium carbides synthetized during casting. The average diameter of carbides was below 2 μm. The structural changes are induced by fast cooling which affects crystallization rate. The hardness (HV30) of the remelted layer was in the range between 250 HV and 425 HV, and was lower than hardness in initial state.

[1] Rohatgi, P. & Asthana, R. (2001). Solidification Science in Cast MMCs: The Influence of Merton Flemings. JOM. 09, 9-13.

[2] Konopka, Z. & Pasieka, A. (2014). The Influence of Pressure Die Casting Parameters on the Mechanical Properties of AlSi11/10 Vol.% SiC Composite. Archive of Foundry Engineering. 14(1), 59-62.

[3] Dulska, A., Studnicki, A. & Szajnar, J. (2017). Reinforcing cast iron with composite insert. Archives of Metallurgy and Materials. 62(1), 355-357.

[4] Olejnik, E., Sikora, G., Sobula, S., Tokarski, T. Grabowska, B. (2014). Effect of compaction pressure aplied to TiC reactants on the Microstructure and Properties of Composite Zones Produced in situ in steel castings. Material Science Forum. Metallography XV. Vol.782, 527-532.

[5] Olejnik, E., Sobula, S., Tokarski, T., & Sikora, G. (2013). Composite zones obtained by in situ synthesis in steel castings. Archives of Metallurgy and Materials. 58(3), 769-773.

[6] Wang, X.H., Song, S.L., Qu, S.Y. & Zou, Z.D. (2007). Characterization of in situ synthesized TiC particle reinforced Fe-based composite coatings produced by multipass overlapping GTAW melting process. Surface and Coatings Technology. 201(12), March, 5899-5905.

[7] Huebner, J., Rutkowski, P., Kata, D. & Kusiński, J. (2017). Microstructural and mechanical study of Inconel 625 - tungsten carbide composite coatings obtained by powder laser cladding. Archives of Metallurgy and Materials. 62(2), 531-538.

[8] Sahoo, Ch.K., Soni, L. & Masanta, M. (2016). Evaluation of microstructure and mechanical properties of TiC/TiC-steel composite coating produced by gas tungsten arc (GTA) coating process. Surface & Coatings Technology. 307, 17-27.

[9] Piątkowski, J., Grabowski, A. & Czerepak, M. (2016). The Influence of Laser Surface Remelting on the Microstructure of EN AC-48000 Cast Alloy. Archive of Foundry Engineering. 16(4), 217-221.

[10] Wrońska, A. & Dudek, A. (2014). Characteristics of surface layer of sintered stainless steels after remelting using GTAW method. Archives of Civil and Mechanical Engineering. 14(3), May, 425-432.

Archives of Foundry Engineering

The Journal of Polish Academy of Sciences

Journal Information

CiteScore 2016: 0.42

SCImago Journal Rank (SJR) 2016: 0.192
Source Normalized Impact per Paper (SNIP) 2016: 0.316


All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 168 107 11
PDF Downloads 77 58 5