Mn-Cr 系低合金鋼の燒戻脆性について

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The following items were investigated using the medium carbon, low Mn-Cr steels containing various amount of P, Mo and Ti. i) Influences of the content of nitrogen in steel and the fixing nitrogen by adding Ti on the temper embrittlement. ii) Influences of the contents of P and Mo in commercial ranges on the temper brittleness. iii) Investigations on the temper brittleness by applying a re-tempering heat treatment. iv) Correlation between the temper embrittlement and the impact transition temperature. v) Correlation between the temper brittleness and the electric resistance. And the results obtained by the investigation were as follows. A) It was observed that the temper brittleness at lower temperature (TELT) ranging 250-350℃ was an irreversible phenomena caused by the decomposition of the martensitic structure, and the mechanism of the TELT was different essentially from the temper brittleness at higher temperature (TEHT) ranging 450-550℃. B) Effects of adding Ti to the TELT were not made clear by this experiments. C) The TEHT was observed apparently by the re-tempering treatment ranging 500-525℃ and was considered to be caused by the precipitation from the fully tempered structure, and the impact transition temperature was raised by this precipitation. D) Increasing P content, both the impact transition temperature of the specimen treated by the tempering and re-tempering were raised, but in order to prevent this appreciable rise in these transition temperature Mo addition was very effective. was is concluded by the investigations that the impact transition temperature depended on the Mo%/P% ratio and that Mo%/P% ≥ 10 was needed to prevent the TEHT in these steels. E) No correlation was observed between the temper brittleness and the electric resistance.
社団法人日本鉄鋼協会の論文
1953-12-25

Mn-Cr 系低合金鋼の燒戻脆性について

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