Acta Metall Sin  1998, Vol. 34 Issue (7): 689-695    DOI:

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THE EFFECT OF APPLIED STRESS ORIENTATION ON THE HIGH TEMPERATURE CREEP BEHAIOUR OF DIRECTIONALLY SOLIDIFIED NICKEL BASE SUPERALLOY

YUAN Chao ; GUO Jianting ; WANG Tieli ; YANG Hongcai ; WANG Shuhe ;ZHANG Hao (Institute of Metal Research; The Chinese Academy of Sciences; Shenyang 110015)(Materials and Metallurgy School; Northeastern University; Shenyang 110006)

YUAN Chao ; GUO Jianting ; WANG Tieli ; YANG Hongcai ; WANG Shuhe ;ZHANG Hao (Institute of Metal Research; The Chinese Academy of Sciences; Shenyang 110015)(Materials and Metallurgy School; Northeastern University; Shenyang 110006). THE EFFECT OF APPLIED STRESS ORIENTATION ON THE HIGH TEMPERATURE CREEP BEHAIOUR OF DIRECTIONALLY SOLIDIFIED NICKEL BASE SUPERALLOY. Acta Metall Sin, 1998, 34(7): 689-695.

Abstract References Related Articles Recommended Metrics Download:  PDF(2443KB)  Export:  BibTeX | EndNote (RIS)       Abstract  The effect of applied stress orientation on the creep and fracture behaviour of a directionally solidified nickel base superalloy at 980 ℃ in the stress range of 130 - 190 MPa has been studied. The results show that the creep curves of three orientation specimens, in which the grain boundaries are oriented longitudinally, transversely, and 45° to the applied stress axis, have the same shape. In terms of Dorn creep law, three orientation specimens have same creep mechanism, which is controlled by the dislocation climb process. The strain to fracture in longitudinal specimens is much higher than that in transverse and inclined specimens, the reason is the change of creep fracture mechanism from the transgranular to intergranular failure mode. Key words:  applied stress orientation      directional solidification      nickel base superalloy      high temperature creep      creep fracture      Received:  18 July 1998      Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y1998/V34/I7/689 1 Duhl D N. In: Sims C T, Stoloff N S, Hagel W C eds., Superalloy II, New York: Wiley, 1987: 189 2 McLean M. Directionally Solidified Materials for High Tempemture Service. London: The Metals Society,1983: 169 3 Tien J K, Coply S M. Metall Trans, 1971; 2: 543 4 Gell M, Duhl D N. In: Alien S et al eds., Processing and Properties of Advanced High-Temperature Alloys,Metals Park, Ohio: ASM, 1986: 41 5 Caron P, Ohta Y, Nakagawa Y G, Khan T. In: Duhl D N et al eds., Superalloys 1988, Warrendale: TheMetallurgical Society, 1988: 125 6 Volki R, Glatzel U, Feller-Kniepmeier M. 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