Two recently developed mechanical tests – a stress versus strain rate relaxation test and a constant displacement rate notched bar test – are described as a basis for measuring the effect of prior creep exposure on 2·25Cr–1Mo steel. These tests were used to monitor property changes resulting from prior creep, in both laboratory tests and also following service exposure in T-pieces of fossil plant main steam piping. Significant changes of properties were measured. These post-exposure tests may be used to monitor damage evolution during service and could form the basis of a life management methodology.
MST/1501
Get full access to this article
View all access options for this article.
References
1.
VISWANATHANR.: ‘Damage mechanisms and life assessment of high temperature components’: 1989, Materials Park, OH, ASM International.
2.
AUEKAREP.‘Advances in life prediction methods’, (ed. WoodfordD. A. and WhiteheadJ. R.), 353; 1983, New York, ASME.
3.
HARTHG. H. and RECHNERM. R.: Power, Aug. 1985, 69.
4.
ETIENNEC. F., an ELSTH. C., and MEIJERSP.:‘Creep of engineering materials and structures’, (ed. BernasconiG. and PiattiG.), 149; 1978, Amsterdam, Applied Science Publishers.
5.
WOODFORDD. A.: ‘Fossil power plant rehabilitation — trends in life management and reliability technology’. 149; 1989, Materials Park, OH, ASM International.
6.
WOODFORDD. A.: J. Mater., Dec. 1990, 18.
7.
GOLDHOFFR. M. and WOODFORDD. A.: STP 515, 89; 1972, Pittsburgh, PA, ASTM.
8.
VISWANATHANR., FOULDSJ. R., and ROBERTSD. A.: Proc. Int. Conf. on ‘Life extension and refurbishment’, The Hague, Netherlands, June 1988, Netherlands Institute of Welding.
9.
KITAGAWAM., FUJIA., YONEYAMAH., NAKAJIMAT., HATTORIH., UMAKIH., and SUGAIK.: IHI Eng. Rev.,1989, 22, (1), I.
10.
PEPEJ. J.: ‘Fossil power plant rehabilitation — trends in life management and reliability technology’, 39: 1989, Materials Park, OH, ASM International.
11.
DeLONGJ. F., BYNUMJ. E., ELLISF. V., RANEEM. H., SIDDALLW. F., DAIKOKUT., and HANEDAH.: Weld. Res. Suppl., Oct. 1985, 271.
12.
HARTE. W.: Ada Metall., 1970, 18, 599.
13.
HARTE. W. and SOLOMONH. D.: Acta Metall., 1973, 21, 295.
14.
WOODFORDD. A.: Metall. Trans.,1975, 6A, 1693.
15.
SMITHG. V.: Proc. Symp. ‘21 chrome 1 molybdenum steel in pressure vessels and piping’, (ed.SchaeferA. O.), 1; 1971, London, The Metals Properties Council.
16.
WOODFORDD. A.: Proc. Ira. Conf. On ‘Creep’, Tokyo, 1986, JSMERMechE/ASMEIASTM, 11.
