Conclusions
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1.
The positive influence of molybdenum in reducing the susceptibility of steels to, reversible temper brittleness is due to the fact that molybdenum inhibits phosphorus diffusion in the phase boundaries.
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2.
Molybdenum does not completely eliminate temper brittleness but only slows down embrittlement processes. In steels without molybdenum the austenite grain boundaries are enriched in phosphorus mainly by means of diffusion along the boundaries of coexisting phases. In steels alloyed with molybdenum the enrichment of the austenite grain boundaries is limited by the volume diffusion of phosphorus.
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Additional information
TsNIIChERMET. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 3, pp 70–72, March, 1969.
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Gruzin, P.L., Mural', V.V. Mechanism of the effect of molybdenum on the reversible temper brittleness of steel. Met Sci Heat Treat 11, 240–242 (1969). https://doi.org/10.1007/BF00658746
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DOI: https://doi.org/10.1007/BF00658746