Abstract
1. The temperature range of cold brittleness depends on the microstructure of the steel. 2. Of the high-strength structures, bainite has the best resistance to brittle fracture (isothermal quenching at 300°C); at the same static strength as bainite, temper troostite has a lower resistance to brittle fracture (tempered at 380°C after oil quenching). 3. The blue brittleness temperature range of steel U7 depends less on the structure. The microstructure affects the temperature at whichan begins to decrease (Tlowblue) but has almost no effect on Tupblue.
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