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Hold-time fatigue crack growth of Allvac 718Plus

M. Hörnqvist ; Leif Viskari (Institutionen för teknisk fysik, Mikroskopi och mikroanalys) ; Krystyna Stiller (Institutionen för teknisk fysik, Mikroskopi och mikroanalys) ; G. Sjob̈erg
7th International Symposium on Superalloy 718 and Derivatives 2010. Pittsburgh, 10-13 October 2010 Vol. 2 (2010), p. 705-717.
[Konferensbidrag, refereegranskat]

The hold-time fatigue behaviour of Allvac 718Plus was investigated both in the as-heat treated condition and after long-time exposure at temperature close to the maximum operating limit. At temperatures above 450°C the introduction of 90 s hold-time at maximum load significantly increased the fatigue crack growth rate. Both conditions showed purely cycle dependent behavior at 450°C and close to purely time dependent behavior at 700°C. At 600°C intermediate behavior was observed. The long-time exposure had little effect on the cyclic (0.5 Hz) crack growth rates, but the resistance to crack growth with 90 s hold-time decreased. No microstructural effects of long-time exposure (700°C/140 h + 675°C/460 h) could be observed by SEM, but there were indications that the hardness of the material increases somewhat after exposure.

Nyckelord: Electron microscopy, Fatigue crack growth, Fractography, Tensile dwell

Denna post skapades 2011-08-31.
CPL Pubid: 145506


Institutioner (Chalmers)

Institutionen för teknisk fysik, Mikroskopi och mikroanalys (2005-2012)



Chalmers infrastruktur

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