Study of the Recycling Grey Cast Iron Swarf by Powder Metallurgy: An Alternative for the Development of New Materials

Abstract:

This work is concerned with issues related to using grey cast iron swarf from dry machining in powder metallurgy. In a first stage, a complete study on the characteristics of the raw powder is performed, in which aspects related to the dilution in different proportion of pure iron were studied. Low compacting pressure produces workpieces more resistant and that the ideal sintering temperature is 1160 °C. In a second stage, aiming at reduction of the powder, a heat treatment is performed. New dilutions using the decarburized powder were made and results showed better structural homogeneity and an improvement in the mechanical properties. The steel alloy 50/50% of swarf powder provided the best results. In a third stage, a cylindrical bearing was produced. New dilutions were made. Based on the control of the interconnected porosity, radial and wear resistance, the sample prepared with 100% swarf powder provided the best results.

• Periodical: Materials Science Forum (Volumes 530-531)
• Pages: 3-9
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.530-531.3
• Online since: November 2006
• Authors: M.L. Parucker, César Edil da Costa
• Keywords: Grey Cast Iron Swarf, Powder Metallurgy (PM), Recycling

References

[1] G.T. Brown, On the grey cast iron powder of making low-cost P/M forging. Progress in Powder Metallurgy, MPIF Princeton, NY, v. 28, pp.243-258, (1972).

[2] T. Nakagawa, F. S. Dai, Sintering and forging of decarbonized cast iron powder. Modern Developments in Powder Metallurgy, v. 12, pp.723-743, (1981).

[3] P. Ramakrishnan, S. L. Palkar, K. Gururaj, Preparation and evaluation of P/M grade iron powder from cast iron swarf. Modern Developments in Powder Metallurgy, v. 15, pp.73-84, (1985).

[4] Y. Takeda et al., Process and properties of newly developed pulverized swarf forging. Modern Developments in Powder Metallurgy, v. 12, pp.745-755, (1981).

[5] W. C. Zapata et al., Reciclagem de cavacos de usinagem por metalurgia do pó. Parte I. 50º. Congresso ABM, São Paulo, pp.431-448, Ago. (1995).

[6] A. Bose, P. G. mukunda, Bearings from machined cast iron swarf powder. Powder Metallurgy International, v. 18, n. 5, pp.333-337, (1986).

[7] Determination of hardness of powder metallurgy products. MPIF. n. 43, (1998).

[8] Tension test specimens for pressed and sintered metal powders. MPIF. n. 10, (1998).

[9] Standart Test Method for: Wear Testing with pin-on-disc Apparatus. ASTM G 99.

[10] Equipe Metalpó, Mancais auto-lubrificantes. São Paulo, (1987).

[11] T. Nakagawa, C. S. Sharma, P/M forging and sintering for the recycling of machining swarf. Modern Developments in Powder metallurgy, v. 9, pp.347-388, (1977).