Dislocation Structures in Nickel Based Superalloy Inconel 792-5A Fatigued at Room Temperature and 700°C

Abstract:

Article Preview

Dislocations structures were studied using transmission electron microscopy in specimens of cast polycrystalline nickel based superalloy Inconel 792-5A cyclically strained up to failure with constant total strain amplitudes at temperatures 23 and 700 °C. Spatial arrangement of dislocations in individual grains was determined using the technique of oriented foils. Planar dislocation arrangements in the form of bands parallel to the {111} planes were observed in specimens cycled at both temperatures. The bands showed up as thin slabs of high dislocation density cutting both the γ channels and γ´ precipitates. They correspond to areas of cyclic slip localization. Experimental results concerning the dislocation structure are used to discuss the effect of temperature on the cyclic stress-strain response and fatigue life.

Info:

Periodical:

Materials Science Forum (Volumes 567-568)

Edited by:

Pavel Šandera

Pages:

429-432

Citation:

M. Petrenec et al., "Dislocation Structures in Nickel Based Superalloy Inconel 792-5A Fatigued at Room Temperature and 700°C", Materials Science Forum, Vols. 567-568, pp. 429-432, 2008

Online since:

December 2007

Export:

Price:

$38.00

[1] J. Polák: Comprehensive Structural Integrity Vol. 4 (2003), p.1.

[2] H. Mughrabi, in: Microstructural Effect and Damage Mechanisms (Fatigue 2002), Higher Education Press, Beijing, China (1999).

[3] K. Obrtlík, P. Lukáš and J. Polák, in: Low Cycle Fatigue and Elasto-Plastic Behaviour of Materials (LCF 4), Elsevier Science Ltd, Amsterdam, 33-38 (1998).

DOI: https://doi.org/10.1016/b978-008043326-4/50011-8

[4] M. Petrenec, K. Obrtlík, and J. Polák: Materials Science and Engineering Vol. A400-401 (2005), p.485.

[5] M. Clavel and A. Pineau: Materials Science and Engineering Vol 55 (1982), p.157.

[6] K. Obrtlík, M. Petrenec, J. Man, J. Polák and K. Hrbáček, in: Fatigue 2006, Georgia Inst. of Technology, Atlanta (2006), paper No. FT307.

[7] M. Petrenec, K. Obrtlík, J. Polák and T. Kruml: Mater. and Technol. Vol. 40 (2006) 5, p.175.

[8] M. Petrenec, K. Obrtlík, J. Polák and J. Man: Key Eng. Mater. Vol. 345-346 (2007), p.383.

[9] M. Petrenec, K. Obrtlík and J. Polák: High temperature low cycle fatigue of superalloys Inconel 713LC and Inconel 792-5A. Key Eng. Mat. (2007), in press.

DOI: https://doi.org/10.4028/0-87849-448-0.101