Highly non-linear creep life induced by a short close gamma '-solvus overheating and a prior microstructure degradation on a nickel-based single crystal superalloy Academic Article uri icon

abstract

  • Specific non-isothermal creep conditions were applied to a 1st generation single crystal nickel based superalloy at very high temperature. Creep tests were conducted under 120 and 160. MPa at 1050. C with one overheating under stress at 1200. C for 30. s. Results were compared to the ones already obtained under 140. MPa on the same alloy as well as on a fourth generation of alloy.It is shown that the residual creep life after a single overheating is optimal after a specific prior-creep time. The impact of the creep degradation prior to an overheating on the creep life is dependent on the magnitude of the effective /. ' lattice mismatch. Indeed, an overheating performed when the effective /. ' mismatch magnitude is maximum leads to longer creep lives, even better than without overheating. 2013 Elsevier Ltd.

published proceedings

  • MATERIALS & DESIGN

author list (cited authors)

  • le Graverend, J., Cormier, J., Gallerneau, F., Kruch, S., & Mendez, J.

citation count

  • 33

complete list of authors

  • le Graverend, J-B||Cormier, J||Gallerneau, F||Kruch, S||Mendez, J

publication date

  • January 2014