Conclusions
The effect of lead on the fatigue strength of structural steels and their susceptibility to embrittlement during heating is due to the difference in the coefficient of thermal expansion of lead particles and iron with heating of lead-containing steels and to the mosaic stresses resulting from this, which induce fracture and prefracture, and also the influence of liquid lead as a surface-active substance with regard to the steel. These characteristics of the behavior of lead particles in steel in the cutting zone at high strain rates are accompanied by an increase of temperature and promote better machinability of the steel in comparison with the steel without lead. On the basis of the results we do not recommend lead-containing steel for parts subject to fatigue and having high strength σb<1200–1400MPa) or for parts heated to 200–500° in the course of operation.
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Additional information
Scientific-Research Institute of Metallurgy, Chelyabinsk. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 11, pp. 6–8, November, 1980.
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Zaslavskii, A.Y. Effect of lead on the properties of structural steel. Met Sci Heat Treat 22, 783–787 (1980). https://doi.org/10.1007/BF00779425
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DOI: https://doi.org/10.1007/BF00779425