Iron Powder Metallurgy by kempton H. Roll, Peter K. Johnson

By kempton H. Roll, Peter K. Johnson

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The results of this study clearly demonstrate the following with regard to properties after sintering: 1. Shrinkage is mainly determined not by the type of powder but by the amount of fine material present. In general, radial and axial shrinkages during sintering increase with increasing amount of fine particles. TABLE 9. 25 1. 500 20,400 20,700 21,800 24,100 24,100 22,000 Compacting Pressure, 50 tsi G E F D C B A (original) Compacting Pressure, 25 tsi Fraction 8 6 6 8 8 8 8 6 4 5 4 5 4 4 "/0 Elongation, Powder 1 Reduced 25,000 21,400 22,800 24,600 24,600 26,200 26,300 17,000 13,100 14,800 15,900 17,700 18,300 19,000 Tensile Strength, psi 14 13 15 14 11 14 15 9 6 8 9 10 11 12 "/0 Elongation, Powder 2 Electrolytic 13,700 12,300 11,800 16,200 24,500 23,600 18,000 7,200 7,200 5,800 8,800 15,200 15,400 10,700 Tensile Strength, psi 2 3 1 3 8 8 5 2 2 2 1 5 5 3 ,,/0 Elongation, Powder 3 Reduced 28,100 23,400 22,800 27,700 24,000 30,800 27,700 15,200 14,400 13,000 15,500 18,300 18,100 17,100 Tensile Strength, psi 7 11 12 16 14 14 10 7 6 4 Ie 7 10 9 ,,/0 Elongation, Powder 4 Electrolytic TABLE 10.

The literature strongly indicates that a number of iron powders of equal properties made by different methods would form compacts and sinterings of equal properties. A. R. POSTER 52 From the preceding discussion it appears that there are two dominating factors concerning the powder which determine sintered properties. The first factor is the complex of characteristics which determine the ability of a powder to be formed into compacts of a given density. These characteristics may be plasticity of the particle as affected by purity and stress conditions, particle density, particle size and particle-size distribution, interparticle contact, surface conditions, and gas content.

7. Tensile strength vs. sintering temperature for sintered samples made from v arious iron powders. (Compaction at 50 tsi using die wall lubrication. ) TABLE 11. 75,,/0 zinc stearate added to each powder. Sintered for 1 hour at2050"F under hydrogen pressure. POSTER 48 change in ductility in a way similar to the density change shown in Fig. 5. Tensile strength changes for carbonyl iron powder samples are different from the density changes, increasing considerably between 400°F and 600°F and undergoing only minor changes for temperatures up to 2000°F.

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