The Effects on Microstructure and Hardness of 0.28% Vanadium and 0.87% Nickel Alloyed Ductile Iron after Boronizing Process

Abstract:

Boronizing/boriding is a thermo mechanical process which produced protective surface layers to enhance the performance of engineering components utilized in mechanical, wear and corrosion. The present study investigate the microstructure and the hardness of boride layers formed on 0.28% Vanadium and 0.87% Nickel alloyed ductile iron after boronizing process. Specimens were boronized at 950° C for 6, 8 and 10 hours holding time before being cooled in the furnace. The microstructure and boride layer formed on the surface of substrates were observed under Olympus BX60 Optical Microscope. Vickers Micro Hardness Tester was also performed to determine the hardness of boride layers. Boride layer was formed by diffusion of the boron into the metal lattice at the surface which composed double phase of FeB and Fe₂B with saw-tooth morphology. The results of this study indicated that the thickness of boride layers increased from 109.8μm at 6 hours to 195.4μm at 8 hours holding time before they crack at 10 hours. The hardness of the material surface also increased from 1535 HV to 1623 HV at 6 and 8 hours respectively. In conclusion, the microstructure, borides thickness and hardness of borides layer were depending on boronizing time while temperature kept constant.

• Periodical: Key Engineering Materials (Volume 740)
• Pages: 65-69
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.740.65
• Online since: June 2017
• Authors: Khalissah Muhammad Yusof*, Bulan Abdullah, Mohd Faizul Idham, Nor Hayati Saad
• Keywords: Boronizing, Ductile Iron, Hardness, Microhardness, Microstructure

References

[1] C. Hsu and K. Lin, A study on microstructure and toughness of copper alloyed and austempered ductile irons, Mater. Sci. Eng. A, vol. 528, no. 18, p.5706–5712, (2011).

DOI: 10.1016/j.msea.2011.04.035

[2] S. F. Fischer, S. Muschna, A. Bührig-polaczek, and M. Bünck, Materials Science & Engineering A In-situ surface hardening of cast iron by surface layer metallurgy, Mater. Sci. Eng. A, vol. 615, p.61–69, (2014).

DOI: 10.1016/j.msea.2014.07.062

[3] B. Abdullah, S. K. Alias, A. Jaffar, N. H. Saad, M. F. Idham, and A. Ramli, XRD Evidence for Phase Structures of Niobium Alloyed Austempered Ductile Iron, vol. 458, p.431–434, (2012).

DOI: 10.4028/scientific5/amr.457-458.431

[4] P. H. S. Cardoso, C. L. Israel, and T. R. Strohaecker, Abrasive wear in Austempered Ductile Irons : A comparison with white cast irons, Wear, vol. 313, no. 1–2, p.29–33, (2014).

DOI: 10.1016/j.wear.2014.02.009

[5] C. Li, B. Shen, G. Li, and C. Yang, Surface & Coatings Technology Effect of boronizing temperature and time on microstructure and abrasion wear resistance of Cr12Mn2V2 high chromium cast iron, vol. 202, p.5882–5886, (2008).

DOI: 10.1016/j.surfcoat.2008.06.170

[6] C. Hsu and K. Lin, A study on microstructure and toughness of copper alloyed and austempered ductile irons, Mater. Sci. Eng. A, vol. 528, no. 18, p.5706–5712, (2011).

DOI: 10.1016/j.msea.2011.04.035

[7] C. Hsu and M. Chen, Corrosion behavior of nickel alloyed and austempered ductile irons in 3 . 5 % sodium chloride, Corros. Sci., vol. 52, no. 9, p.2945–2949, (2010).

DOI: 10.1016/j.corsci.2010.05.006

[8] K. Ozgur, Y. Gencer, M. Tarakci, and A. Calik, Surface & Coatings Technology The effect of vanadium on the boronizing properties of pure iron, Surf. Coat. Technol., vol. 221, p.104–110, (2013).

DOI: 10.1016/j.surfcoat.2013.01.034

[9] M. A. D. Ruiz, N. L. Perrusquia, D. S. Huerta, C. R. T. San, G. M. U. Calderón, E. A. C. Moreno, and J. V. C. Suarez, Growth kinetics of boride coatings formed at the surface AISI M2 during dehydrated paste pack boriding, Thin Solid Films, vol. 596, p.147–154, (2015).

DOI: 10.1016/j.tsf.2015.07.086

[10] T. Balusamy, T. S. N. S. Narayanan, K. Ravichandran, I. Song, and M. Ho, Surface & Coatings Technology Effect of surface mechanical attrition treatment ( SMAT ) on pack boronizing of AISI 304 stainless steel, Surf. Coat. Technol., vol. 232, p.60–67, (2013).

DOI: 10.1016/j.surfcoat.2013.04.053

[11] B. Topçu, M. Kul, K. O. Oskay, A. Temizkan, B. Karaca, and L. C. Kumruo, Effect of boronizing composition on boride layer of boronized GGG-60 ductile cast iron, vol. 126, p.80–83, (2016).

DOI: 10.1016/j.vacuum.2016.01.021

[12] Y. Jian, Z. Huang, J. Xing, and B. Wang, Materials Characterization Effects of chromium addition on fracture toughness and hardness of oriented bulk Fe 2 B crystals, Mater. Charact., vol. 110, p.138–144, (2015).

DOI: 10.1016/j.matchar.2015.10.017

[13] B. Topçu, M. Kul, K. O. Oskay, A. Temizkan, B. Karaca, and L. C. Kumruo, Effect of boronizing composition on boride layer of boronized GGG-60 ductile cast iron, vol. 126, p.80–83, (2016).

DOI: 10.1016/j.vacuum.2016.01.021

[14] S. Sahin and C. Meric, Investigation of the effect of boronizing on cast irons, vol. i, p.971–979, (2002).

DOI: 10.1016/s0025-5408(02)00697-9

[15] U. Sen, S. Sen, and F. Yilmaz, Effect of copper on boride layer of boronized ductile cast irons, vol. 72, p.199–204, (2004).

DOI: 10.1016/s0042-207x(03)00127-1

[16] U. Sen, S. Sen, and F. Yilmaz, An evaluation of some properties of borides deposited on boronized ductile iron, vol. 148, p.1–7, (2004).

DOI: 10.1016/j.jmatprotec.2004.01.015

[17] S. Sarper and R. Varol, The effect of surface hardening treatments on the mechanical properties of iron based P / M specimens, vol. 204, p.236–240, (2010).

DOI: 10.1016/j.powtec.2010.08.007

[18] C. Meric, S. Sahin, B. Backir, and N. S. Koksal, Materials & Design Investigation of the boronizing effect on the abrasive wear behavior in cast irons, vol. 27, p.751–757, (2006).

DOI: 10.1016/j.matdes.2005.01.018