Role of Debinding to Control Mechanical Properties of Powder Injection Molded 316L Stainless Steel


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316L stainless steel is widely used in various industries due to low cost, ease of availability and exceptional combination of mechanical properties along with corrosion resistance as compared to the other available metal alloys. In powder injection molding, debinding is very critical step and improper debinding can change the final properties dramatically. In the present study, affects of debinding on mechanical properties of powder injection molded 316L stainless steel were studied. The prepared feedstocks were molded according to MPIF 50 standard using vertical injection molding machine (KSA100). The plastic binder was removed at 450°C from the molded test samples using two different furnaces i.e. commercial and laboratory furnace followed by the sintering in vacuum, hydrogen, mixture of H2 and N2 (9:1) and nitrogen at 1325°C for 2hr with post sintering cooling rate 3°C/min . Test samples debound in commercially available furnace showed 97% densification and higher mechanical properties. The corrosion resistance was reduced due to presence of residual carbon during thermal debinding. The presence of carbon and formation of carbides and nitrides were confirmed by XRD and microstructural analysis. The results showed that the test samples debound in commercial furnace showed brittle behavior due to the presence of carbides and nitrides. Test samples sintered in N2 showed 96.3% density and tensile strength 751MPa. This value of strength is twice as compared to the sample debound in laboratory furnace followed by the sintering in vacuum. The achieved mechanical properties in vacuum sintered samples were comparable to the wrought 316L stainless steel (according to ASTM standard).



Edited by:

Jin Yun and Dehuai Zeng




M. R. Raza et al., "Role of Debinding to Control Mechanical Properties of Powder Injection Molded 316L Stainless Steel", Advanced Materials Research, Vol. 699, pp. 875-882, 2013

Online since:

May 2013




[1] B.S. Zlatkov, et al. Recent Advances in PIM Technology I, Science of Sintering, 40(2008)79-88.

[2] R.M. German and A. Bose. Powder Injection Molding of Metal and Ceramics: Metal Powder Industries Federation, Princeton, N. J, (1997).

[3] M. Rafi Raza, F. Ahmad. M. A. Omar, R. M. German. Effects of cooling rate on mechanical properties and corrosion resistance of vacuum sintered powder injection molded 316L stainless steel, Journal of Materials Processing Technology, 212(2012).


[4] R. M. German, Powders, binders and feeds tocks for powder injection molding, Powder Injection Moulding International, 1(2007)34-39.

[5] M. T. Zaky, F. S. Soliman, , A.S. Farag, Influence of paraffin wax characteristics on the formulation of wax-based binders and their debinding from green molded parts using two comparative techniques, Journal of Materials Processing Technology, 209(2009).


[6] A. Nylund, Tunberg, T., Bertilsson, H., Carlstrom, E., Olefjord, I., Injection molding of gas and water-atomized stainless steel powders, International Journal of Powder Metallurgy, 31(1995)365-373.

[7] N.H. Loh et al. Production of metal matrix composite part by powder injection molding, Journal of Materials Processing Technology, 108(2001)398-407.


[8] C.H. Ji et al. Sintering study of 316L stainless steel Metal Injection Molding parts using Taguchi method: final density, Materials Science and Engineering, 311(2001)74-82.


[9] Yimin Li et al. Thermal debinding processing of 316L stainless steel powder injection molding compacts, Journal of Materials Processing Technology, 137(2003) 65-69.


[10] Kim Yong et al. Supercritical Carbon Dioxide Debinding in Metal Injection Molding ( MIM ) Process, Korean J. Chem. Eng., 19(2002)986-991.


[11] S. Liu et al. Thermal debinding mechanism of metal injection molding compacts in vacuum, Transactions of the Nonferrous Metals Society of China(China), 9(1999)338-341.

[12] M. A. Omar, et al. Rapid debinding of 316L stainless steel injection moulded component, Journal of Materials Processing Technology, vol. 140, pp.397-400, (2003).


[13] Verein Deutscher Eisenhüttenleute, Ed., Steel - A Handbook for Materials Research and Engineering: Volume 1: Fundamentals. Springer, (1992).

[14] B. Levenfeld et al. Effect of residual carbon on the sintering process of M2 high speed steel parts obtained by a modified metal injection molding process, Metallurgical and Materials Transactions A, 33(2002)1843-1851.


[15] B.S. Becker et al. Sintering of 316L stainless steels to high density via the addition of chromium-molybdenum dibromide powders Part1: sintering performance and mechanical properties, in Proceedings of the Institution of Mechanical Engineers. Part L, Journal of materials, design and applications, LHL, 2000, pp.139-152.


[16] H.Ö. Gülsoy and S. Salman, Microstructures and mechanical properties of injection molded 17-4PH stainless steel powder with nickel boride additions, Journal of Materials Science, 40(2005)3415-3421.


[17] Bostjan Berginc et al. The influence of MIM and sintering-process parameters on the mechanical properties of 316L SS, MATERIALI IN TEHNOLOGIJE, 40(2006)193-198.

[18] Palloma Vieira Muterlle, Microstructural and mechanical properties of Co and Ti alloys for biomedical applications produced by metal injection molding (MIM), Ph. D, Materials engineering University of Trento, 2010. 7.