Study on the mechanical stability of reversed austenite in super martensitic stainless steel via in-situ synchrotron high energy X-ray diffraction

Effect of intercritical quenching soaking time on cryogenic toughness and internal friction characterization of 9Ni steel

“…Developing low carbon, high nickel steel [5] can be summarized as double normalizing and tempering (NNT), quenching and tempering (QT), and quenching, intercritical quenching and high temperature tempering (QLT) processes. Many studies have shown [6,7] that the low-temperature mechanical properties of low-carbon, high-nickel steels directly depend on the reversed austenite (RA) precipitated along the grain boundary of martensite and prior austenite after tempering. Notably, adding intercritical quenching treatment (quenching between A c1 and A c3 temperatures, referred to as L) to the QT process, intercritical quenching heat soaking time (IQST) is vital in regulating reversed austenite.…”

“…Hence, the QLT has gradually become essential in preparing 9Ni steel. Literature [7] shows that 16% Cr-5% Ni super martensitic stainless steel can obtain film and block reversed austenite after tempering at 620 °C for different times, and only part of block reversed austenite is transformed into martensite during the tensile process, and the mechanical stability of steel is poor. Liu et al [8] designed a new process for regulating retained austenite, which produced a high content of retained austenite and improved the strength and toughness of maraging steel.…”