| Autor: |
Krasovskii, A. Ya., Kalaida, V. V., Kramarenko, I. V., Krasiko, V. N., Kashtalyan, Yu. A., Litovka, V. I. |
| Zdroj: |
Strength of Materials; August 1984, Vol. 16 Issue: 8 p1112-1121, 10p |
| Abstrakt: |
Conclusions 1.For high-strength irons with nodular graphite the coefficient a in Eq. (2) should be taken as equal to 1.7–1.8.2.To obtain high-strength iron with nodular graphite and possessing high crack resistance the pearlite content must not exceed 60% and the manganese content 0.6%.3.A good correlation has been established between fracture toughness and the average distance between the graphite inclusions.4.The fracture micromechanism of irons is determined to a great degree by the tendency of the matrix toward plastic deformation under the given specific conditions. In the case of an embrittled matrix failure occurs by transgranular cleavage, and under conditions favoring plastic flow irons fail with the formation of so-called honeycomb relief.5.The graphite inclusions play an important role in the fracture micromechanism. Being elementary stress raisers in a relatively uniform matrix, they promote the development of spherical voids around the nodules with subsequent rupture of the crosslinks and the formation of a honeycomb relief (if the matrix is formed plastically) or the appearance of brittle microcracks in the vicinity of them (if the matrix is embrittled). |
| Databáze: |
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