Maraging steel is normally aged at 480 to 510°C whereas its As is below 560°C. In the present study, the specimens were aged at 510°C and 570°C for durations of180 and 10 min, respectively. The hardness, tensile strength, notch tensile strength, and phases formed were determined. The kinetics of the aging process were studied and the activation energies determined. The distribution of precipitates formed was studied using TEM. The results show that a short exposure at 570°C can impart properties comparable to those of the traditionally aged material.
WEISSB. Z.: ‘Recent developments in specialty steels and hard materials’, (ed.CominsN. R. and ClarkJ. B.), 35; 1982, Pretoria, Pergamon Press.
4.
FLOREENS. and DECKERR. F.: ‘Source book on maraging steel’, 32; 1962, Metals Park, OH, ASM.
5.
HUSAINS. W., AHMEDM. and KHANNI. A.: in ‘Advanced materials ‘93, III/A’, Transactions of the Materials Research Society, Vol. 16A, 721-724; 1994, Amsterdam, Elsevier Science.
6.
AHMEDM., FAROOQUEM., HASHMIF. H., and KHANA. Q.: in Proc. 4th Asia—Pacific Conf. on ‘Electron microscopy’, Bangkok, Thailand, July 1988, Asia—Pacific Society of Electron Microscopy.
AHMEDM., FAROOQUEM., HASHMIF. H., HUSAINS. W., and KHANA. Q.: in ‘Maraging steel — recent development and applications’, 269; 1988, Warrendale, PA, TMS.
9.
IQBALJ., TAUQIRA., ZAIGHAMH., and taA.HAQ: in ‘Phase transformations 96’, (ed A. ul Haq et al.), 204; 1996, Rawalpindi, Dr A. Q. Khan Research Laboratories
10.
FAWADH., ZIAGHAMH., TAUQIRA., HASHMIF. H., and KHANA. Q.: in ‘Proceedings of the 3rd international symposium on advanced materials’, Islamabad, Pakistan, September 1993, 328; 1994, Rawalpindi, Dr A. Q. Khan Research Laboratories.
11.
FLOREENS.: in ‘Metals handbook’,9th edn,Vol. 1,446; 1978, Metals Park, OH, ASM.
12.
SQUIRESD. R. and WILSONE. A.: Metall. Trans. A, 1984, 15A, 1947.
