The mechanical stability of austenite in maraging steels

Effect of Cyclic Aging on Mechanical Properties and Microstructure of Maraging Steel 250

“…However, presence of c at prior austenite grain boundaries was not detected. Austenite phase is normally observed in overaged steels formed by diffusion mechanism as a consequence of isothermal treatment above A s temperature ( Ref 7,9,25,31,32). Formation of reverted c is also known to occur by shear mechanism as a result of thermal cycling in the dual a + c phase region ( or as a result of thermal cycling between a fi c (Ref [14][15][16][17][18][19].…”

Effects of cold rolling on the microstructure and mechanical properties of Fe-Ni-Mn-Mo-Ti-Cr maraging steels

“…After solution annealing in the austenitic state, these steels transform to lath martensite in subsequent non-equilibrium cooling conditions [2]. Strengthening of maraging steels takes place in the precipitation of metastable intermetallics during appropriate aging of martensite [3]. The commercial grades of these steels are 18Ni maraging steels with and without Co content, which are expensive because of their alloy contents [4].…”

Effect of aging on the microstructure and tensile properties of Fe–Ni–Mn–Cr maraging alloys

“…Strengthening of maraging steels takes place by precipitation of metastable intermetallics during appropriate aging of martensite. However, prolonged aging of martensite leads to the formation of solute-enriched, reverted austenite, which chemically retains after subsequent cooling to ambient temperature [3]. Dislocation hardening of austenite and further alloying of maraging steels also lead to the austenite retention at ambient temperature [4].…”