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Effect of porosity on the ductility and ductile failure mechanism of powder iron

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Soviet Powder Metallurgy and Metal Ceramics Aims and scope

Conclusions

Formation of the ductility characteristics of the powder materials based on iron is associated with the transformation of the porous structure during deformation. The model proposed by Gerland [1] for materials with particles describes accurately the behavior of the material containing pores and links the true strain to fracture with porosity.

The experimental dependence er=F(O) explains satisfactorily the formation of certain important processing characteristics of the material, such as cracking resistance and impact toughness. Since the yield stress of the material produced from various powders differs only slightly in a wide range of porosity, the main contribution to formation of cracking resistance and impact thoughness comes from the true strain to fracture (er).

The difference in the content of the second phase particles in the iron powders of variousggrades leads to differences in the er values for the dense states; er decreases with increasing porosity. Thus, the high values of the impact toughness for the materials produced from WPL-200 and O Cher MK powders are explained by the low content of the second phase particles (1–2%) in comparison with the other materials, where the volume fraction of the particles was 3–5%.

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Authors and Affiliations

  1. Institute of Problems of Materials Science, Academy of Sciences of the Ukrainian SSR, Kiev

    S. A. Firstov, Yu. N. Podrezov, A. G. Zherdin, L. G. Shtyka, é. Ch. Pioro, M. E. Golovkova & N. Ch. Pioro

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  1. S. A. Firstov
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  2. Yu. N. Podrezov
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  3. A. G. Zherdin
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  4. L. G. Shtyka
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  5. é. Ch. Pioro
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  6. M. E. Golovkova
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  7. N. Ch. Pioro
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Translated from Poroshkovaya Metallurgiya, No. 10(298), pp. 90–96, October, 1987.

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Firstov, S.A., Podrezov, Y.N., Zherdin, A.G. et al. Effect of porosity on the ductility and ductile failure mechanism of powder iron. Powder Metall Met Ceram 26, 855–861 (1987). https://doi.org/10.1007/BF00794374

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  • DOI: https://doi.org/10.1007/BF00794374

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