Thermomechanical treatment of 20GMR steel during uninterrupted cooling
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The development of brittleness in 20GMR steel at cooling rates of 20–30°/min is due to the greatly deformed structure of low-carbon martensite, in which dislocations are strongly pinned by carbon atoms.
The following mechanical properties can be obtained in parts of 20GMR steel 5–70 mm thick as the result of deformation at 800–700°C during uninterrupted cooling: σb = 145-120 kg/mm2, σ0.2 = 100-80 kg/mm2; δ=10–15%.
TMT of bainitic steels can be conducted during cooling in air without any additional heat treatment.
KeywordsMechanical Property Heat Treatment Martensite Brittleness Carbon Atom
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