The measurement of ultrasonic velocity of 9Cr-1Mo ferritic steel thermally aged at 793 and 873 K exhibited four distinct regimes in the variation of ultrasonic velocity with aging time. These different regimes have been correlated with the progressive evolution and coarsening of precipitate microstructure studied using TEM and microhardness measurements. The study revealed that ultrasonic velocity can be used to examine the secondary precipitation in the steel and the use of this technique as such can be extended to the health assessment of a component during service.
Get full access to this article
View all access options for this article.
References
1.
MIGNOGMAR. B., DUKEJ. C. and GREENR. E.: Mater. Eval.,1980, 38, 37–42.
2.
MCINTYREP.(Ed.):Non-destructive testing handbook’, 2nd edn,Vol. 7; 1991, Columbus, OH, American Society for Non-Destructive Testing.
PERRINGS., SMITHR. L., HUDSONB. and REYNOLDSW. N.: Philos. Mag. A, 1985, 52A, 721–727.
6.
WILLEMSH., BENDICKW. and WEBERH.: Proc 2nd I. Symp On Non-destructive characterization of materials’, Montreal, Canada, July 1986, Industrial Materials Research Institute, (ed.BussiereJ. F. et al), 471–479.
7.
JAYAKUMART.BALDEV RAJ and W. H. ARNOLD: in ‘Review of progress in quantitative NDE’, (ed. D. 0. Thomson and D. E. Chomenti), 1693-1699; 1991, New York, NY, Plenum.
8.
GOOMEZ ALVAREZ-ARENAST., RIERA-FRANCOE.SARABIADE and GALLEGO-JUAREZJ.: Ultrasonics, 1993, 31, 155–159.
9.
KUMARANISH, JAYAKUMART., PALANICHAMYP. and RAJBALDEV : Scr. Mater., 1999, 40,333–340.
10.
VANI SHANKAR, ANISH KUMAR, K. BHANU SANKARA RAO, T. JAYAKUMAR and BALDEV RA): Proc. Int. Symp. On ‘Materials ageing and life management’, Kalpakkam, India, October 2000, 254-259; 2000, Chennai, Allied.
11.
CHOUDHARYB. K., SAROJAS., K. BHANU SANKARA RAO and S. L. MANNAN: Metall. Mater. Trans A, 1999, 30A, 2825–2834.
12.
RAOB. P. C., JAYAKUMART., BHATTACHARYAD. K. and RAJBALDEV:J. Pure AppL Ultrasonics, 1993, 25, 53–59.
13.
SANDERSONS. J.: Met. Sci., 1978, 12, 220–222.
14.
WALLM., EDWARDSB. C. and HUDSONJ. A.: Proc. Specialist Meeting on ‘Mechanical properties of structural materials including environmental effects’, Chester, England, October 1983, IAEA, Report IWGFR–49, 545-577; 1984.
15.
TITCHMARSHJ. M., WALLM. and EDWARDSB. C.: Proc. Conf. on ‘Analytical electron microscopy’, (ed.WilliamsD. W. and JoyD. C.), 247-250; 1984, San Francisco, CA, San Francisco Press.
16.
HIPPSLEYC. A. and HAWORTHN. P.: Mater. Sci. Technol., 1988, 4, 791–802.
17.
SENIORB. A., NOBLEF. W. and EYREB. L.: ActaMetall, 1988, 36, 1855-1862.
