Höring, S. ; Abou-Ras, D. ; Wanderka, N. ; Leitner, H. ; Clemens, H. ; Banhart, J.: Characterization of Reverted Austenite during Prolonged Ageing of Maraging Steel CORRAX. Steel Research International 80 (2009), p. 84-88
10.2374/SRI08SP116
Abstract:
Microstructure and mechanical properties have been studied in CORRAX maraging steel during prolonged ageing up to 300 h at 798 K. Strengthening of maraging steel was caused by the formation of an intermetallic phase enriched in Ni and Al that is an ordered B2 (CsCl) superlattice structure. Precipitation hardening was accompanied by an increase in micro-hardness with maximum peak hardness after about 12 h of ageing. After 300 h of ageing, the micro-hardness value is still high, corresponding to 94% of the peak hardness. The reverse transformation of martensite to austenite does practically not take place during prolonged ageing as shown by X-ray and electron backscatter diffraction (EBSD) analysis. The experimentally determined amount of austenite (1-2 vol.%) is in good agreement with the calculated value (about 2.5 vol.%).