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Time- and cycle-dependent crack propagation in Haynes 282

Jonas Saarimäki ; Johan Moverare ; Magnus Hörnqvist Colliander (Institutionen för fysik, Materialens mikrostruktur (Chalmers))
Materials Science & Engineering: A (0921-5093). Vol. 658 (2016), p. 463-471.
[Artikel, refereegranskad vetenskaplig]

Haynes 282 is a promising superalloy candidate for several high-temperature applications in both aero and land-based gas turbine engines. To study the crack growth behaviour under time-dependent conditions relevant to such applications, a test program was carried out at room temperature up to 700 °C with conditions ranging from pure cyclic to sustained tensile loading. At 650 °C and high stress intensity factors the crack growth was fully time-dependent for dwell-times of 90 s and longer. At lower stress intensities, the behaviour was mainly controlled by the cyclic loading, even under dwell conditions. The behaviour under dwell-fatigue conditions was well described by a liner superposition model. The main crack growth occurred transgranularly at room temperature and there was a transition in cracking behaviour from cycle dependent transgranular growth to time-dependent intergranular propagation at dK=45 MPa m^0.5 for the high temperature tests. No effect of cyclic frequency could be observed at room temperature, and at lower frequencies the crack growth rate increased with temperature.

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Denna post skapades 2016-03-18. Senast ändrad 2017-03-06.
CPL Pubid: 233436


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