|
|
|
| CREEP RUPTURE BEHAVIOUR OF SALT-COATED SUPERALLOY GH37 IN A HOT ENVIRONMENT |
| by LIN Dongliang (T. L. Lin); HUANG Wei; ZHANG Yuanghu (Shanghai Jiaotong University)(Manuscript received 3 May; 1986; revised manuscript 28 July; 1986) |
|
Cite this article:
by LIN Dongliang (T. L. Lin); HUANG Wei; ZHANG Yuanghu (Shanghai Jiaotong University)(Manuscript received 3 May; 1986; revised manuscript 28 July; 1986). CREEP RUPTURE BEHAVIOUR OF SALT-COATED SUPERALLOY GH37 IN A HOT ENVIRONMENT. Acta Metall Sin, 1987, 23(5): 413-420.
|
|
|
Abstract The creep rupture behaviour of a wrought Ni-base superalloy GH37, bared or coated by a mixture of 10% NaCl and 90% Na_2SO_4 (by wt), has been studied from exposure to air at temperature range of 700-850℃ under stress range of 196-509.6MPa. The creep rupture life and ductility of the salt-coated specimens are reduced dramatically, whereas the ε_(min) is hardly influenced. The hot corrosion does Hot change the creep mechanism since the creep activation energy and stress exponent obtained of coated specimens are nearly similar to the bared ones in air. In the hot corrosion envirnonment of a higher temperature and lower stress, saying, 800℃ and 264 MPa, the finer the grain size, the more severe the reduction of creep rupture life is, while at lower temperature and higher stress, saying, 700℃ and 509.6MPa, the creep rupture life of the alloy with intermediate grain size is longest. It seems that the Shortening of creep rupture life of salted specimen is due to the decomposition of carbides, depletion of Cr and sulphation at grain boundaries which lead to an increase of creep crack nucleation and growth rate
|
|
Received: 18 May 1987
|
1 Lin T L, Zhang Y H, Yang H W. Mater Sci Eng, 1984; 62: 17
2 Guo JT (郭建亭), Ranucci D, Picco E, Strocchi P M. In: Brunetaud R et at eds., High Temperature Alloys For Gas Turbines, Dordrecht R Neth: D. Reidel, 1982: 805
3 魏翔云,郝惠清,肖耀天.金属学报,1984;20:A365
4 吉蕖正行,宫川大诲,坂本庸晃,藤代大,铁钢,1982;68:120
5 Nicholls J R, Samnal J, Hurst R C, Hancock P. In: Kirman I et al eds., Behaviour of High Temperature Alloys in Aggressive Environment, Proc Pettern Int Conf, Londou: The Metal Soc, 1980: 911
6 Tien J K, Davidson J M. In: Fontana M G, Steahle R W eds., Corrosion Science and Technology, vol. 7, New york and London; Plenum, 1976: 1
7 张源虎,胡赓祥.机械工程材料,1985;9(1) :13
8 Mrowec S. In: Proc 8th Int Conf on Metallic Corrosion of Mainz, Frankfurt am Main: DECHEMA Deutsche Gesellschaft fur Chemisches Apparatewesen, 1981: 2110# |
| No Suggested Reading articles found! |
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
| |
Shared |
|
|
|
|
| |
Discussed |
|
|
|
|
