Abstract
For high-nitrogen Fe-19Cr-21Mn-1.5V-0.3C-0.9N (wt. %) steel water-quenched from the different solution-treatment temperatures (1100ºС and 1200ºС, 1h), the tensile mechanical properties and fracture micromechanisms were investigated in a temperature range of 77K to 673K. Increase in quenching temperature (QT) provides a partial dissolution of precipitates and increases a solid-solution hardening effect in the steel. A yield strength, tensile strength, strain-hardening coefficient and plasticity are QT-dependent characteristics. Independently on QT and test temperature, steel specimens fracture in ductile transgranular mode except for 77K-temperature, where dimples and some cleavage components are observed on fracture surfaces. The variation in QT allows one to decrease the fraction of cleavage component: 8% for QT=1100ºС and 25% for QT=1200ºС.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
