Vysokoteplotní plastické vlastnosti nízkolegovaných Cr-Mo ocelí s různým obsahem uhlíku

Abstract

By using simulator HDS-20 were investigated plastic properties at high temperature of two low-alloy Cr-Mo steels, which differed to carbon and manganese content. By special test are established the nil-strength temperature of both steels. In case of 4130 steel, the nil-strength temperature was equal to 1444 °C, however in case of 4140 steel (with higher carbon content), the nil-strength temperature was qual to 1402 °C. By means of the uniaxial tensile tests performed on the plastic properties i.e. the steels ductility at high temperature. 4130 steel, reported the highest ductility at 1300 °C up to 1370 °C, but 4140 steel showed the highest ductility from 1300 °C just to 1340 °C. For 4130 steel is average point of the nil-ductility temperature at 1405 °C, in case of 4140 steel is average point of the nil-ductility temperature equal to 1369,5°C. Higher content of carbon and manganese in 4140 steel has resulted decreased by 42 °C nil-strength temperature compared to 4130 steel. Also that has resulted decreased by 35,5 °C nil-ductility temperature.