Effects of Heat Treatment on Strength Wear Sintered Alloy Steels

Abstract:

This paper presents the results of experimental research on thermal treatment of alloyed sintered steels and much the development of Fe‒3Mn‒1Mo‒1.5Cr‒0.5B‒0.45Graphite powder using mechanical alloying (MA). It was analyzed the influence of MA time on the morphology of the compound by electron microscopy SEM. The research has followed the study of the particle size powder mixtures influence obtained by mechanical alloying, compaction parameters and sintering process on the chemical and structural characteristics of the alloyed sintered steels. Thus there were compacted samples at 600, 700 and 800 MPa. The samples were heated using argon at a temperature of 1150°C using 60 minutes as a maintaining time. Cooling to the room temperature was achieved using a speed of about 30°C/ minutes. With the resulting steels, we have made metallographic determinations using optic microscopy and determinations of the main mechanical properties. Heat treatment took place (heating at 960°C and cooling in the H₂O solution and 10% NaCl) in order to improve the properties of alloyed sintered steel hardness and strength. Specimens quenched and tempered have high wear coefficient compared with specimens as-sintered.

• Periodical: Advanced Materials Research (Volume 1128)
• Pages: 315-321
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1128.315
• Online since: October 2015
• Authors: Ionela Gabriela Bucşe*, Olimpia Ghermec, Mariana Ciobanu, Christian Ghermec, Claudiu Nicolicescu
• Keywords: Heat Treatment, Powder metallurgy, Sintered Alloy Steels, Strength Wear

References

[1] M. Campos, S. Kremel, M. T. Puscas, Y. Yu, D. Sanchez, J. M. Torralba, Effect of heat treatments on Cr-Mo steels based on astraloy Cr powder grade whit manganese auditions, Materials Science Forum 416-418, 1 (2003) 82-88.

DOI: 10.4028/www.scientific.net/msf.416-418.82

[2] A. Babakhania, A. Haerian, M. Ghambri, Effect of heat treatment, lubricant and sintering temperature on dry sliding wear behavior of medium alloyed chromium PM steels, Journal of Materials Processing Technology 204, (2008), 192-198.

DOI: 10.1016/j.jmatprotec.2007.11.061

[3] G. F. Bocchini,  B. Rivolta,  G. Silva,  E. Poggio,  M. R. Pinasco,  M. G. Ienco, Microstructural and mechanical characterization of some sinter hardening alloys and comparisons with heat treated PM steels, Powder Mettalurgy 47 (2004) 343-351.

DOI: 10.1179/003258904x14464

[4] C. Schade, T. Murphy, A. Lawley, R. Doherty, Microstructure and mechanical properties of PM steels alloyed with silicon and vanadium, International Journal of Powder Metallurgy 48 (2012).

[5] H. Khorsand, S.M. Habibi, H. Yoozbashizadea, K. Janghorban, S. M. S. Reihani, H. Rahmani Seraji, M. Ashtari, The role of heat treatment on wear behavior of powder metallurgy low alloy steels, Materials & Design, 23 (2002) 667-670.

DOI: 10.1016/s0261-3069(02)00046-8

[6] J. Wang, H. Danninger, Dry sliding wear behavior of molybdenum alloyed sintered steels, Wear 222 (1998) 49-56.

DOI: 10.1016/s0043-1648(98)00279-8

[7] S. Saritas, R.D. Doherty, and A. Lawley, Effect of Porosity on the Hardenability of P/M Steels, Advances in Powder Metallurgy & Particulate Materials, compiled by W.B. Eisen and S. Kassam, MPIF, Princeton, NJ, part 10, (2001) 112-129.

[8] G. Totten, Raton Boca, Steel Heat Treatment: Metallurgy and Technologies, CRC Press FL (2007) 179-191.

[9] Chris Schade, Tom Murphy, Alan Lawley, Roger Doherty, Microstructure and mechanical properties of PM steels alloyed with silicon and vanadium, International Journal of Powder Metallurgy 48 (2012) 41-50.

[10] Kuen-Shyang Hwang, Chen Hsu, and Li-Hui Cheng, Ultrahigh strength sinter-hardening MIM alloy steels, International Journal of Powder Metallurgy 01 (2012) 35-44.

[11] K. Palaniradja, N. Alagumurthi, V. Soundararajan, Optimization of Process Variables in Gas Carburizing Process: A Taguchi Study with Experimental Investigation on SAE 8620 and AISI 3310 Steels, Turkish Journal of Engineering and Environmental Science 29 (2005).

DOI: 10.1080/amp-200060671

[12] S-J Lee, M.T. Lusk, Y-K Lee, Conversional model of transformation strain to phase fraction in low alloy steels, Journal Acta Materialia 55 (2007) 875-882.

DOI: 10.1016/j.actamat.2006.09.008

[13] M. Campos and J. M. Torralba, Surface assessment in low alloyed Cr–Mo sintered steels after heat and thermochemical treatment, Surface and Coatings Technology 182 (2004) 351-362.

DOI: 10.1016/j.surfcoat.2003.07.007