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Austenite steels are commonly superior in low temperature toughness.But it has beenfound that low temperature embrittlement indeed occurs in some austenite Fe-Mnalloys.I.N.Bogachev believed that it might be caused by a fcc—fct phase transformationat about-100℃.Experiments showed.(1) the existence of low temperatureembrittlement in some austenitic Fe-Mn alloys;(2) the transition temperature ofembrittlement rised with the increase of manganese content and appearance ofintergranular brittle fracture;(3) the segregation of manganese at grain boundaries andits extent varying directly with the manganese content of alloys;(4) the low temperatureembrittlement caused by manganese segregation at grain boundaries.But no evidenceindicates that the low temperature embrittlement of Fe-Mn alloys is caused by anfcc-fct phase transformation at about-100℃ as mentioned by I.N.Bogachev.
Austenite steels are commonly superior in low temperature toughness. But it has been found that low temperature embrittlement substantive in some austenite Fe-Mnalloys. INBogachev believed that it might might caused by a fcc-fct phase transformationat about-100 ° C. Experiments showed. (1) the existence of low temperatureembrittlement in some austenitic Fe-Mn alloys; (2) the transition temperature of embrittlement rised with the increase of manganese content and appearance of intergranular brittle fracture; (3) the segregation of manganese at grain boundaries and sites extent varying directly with the manganese content of alloys; (4) the low temperature embrittlement caused by manganese segregation at grain boundaries. But no evidence that these low temperature embrittlement of Fe-Mn alloys is caused by anfcc-fct phase transformation at about-100 ° C as mentioned by INBogachev.