Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Reexamination Certificate
2011-05-10
2011-05-10
King, Roy (Department: 1733)
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
C416S24100B, C420S447000
Reexamination Certificate
active
07938919
ABSTRACT:
A heat treatment method for a nickel-based superalloy, in particular for the production of single-crystal components or directionally solidified components having a chemical composition permits full solution annealing at a temperature T1, the method comprising: partially solution annealing in a controlled manner at a temperature T2<T1in a first step so as to obtain 5-10% of undissolved γ′ phase in a residual eutectic; and performing a two-stage ageing treatment at respectively lower temperatures in a second step. As a function of the selected level of the partial solution annealing temperature, the proportion of the undissolved γ′ phase can be adjusted in a controlled way, and the tolerance with respect to the disorientation of small-angle grain boundaries/grain boundaries can be increased.
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Jung-Chel Chang et al. “Development of Microstructure and Mechanical Properties of a Ni-Base Single-Crystal Superalloy by Hot-Isostatic Pressing”, Journal of Materials Engineering and Performance, ASM International, Materials Park, OH, US, vol. 12, Aug. 2003, pp. 420-425, XP-001169993.
Kuenzler Andreas
Nazmy Mohamed Youssef
Staubli Markus
Alstom Technology Ltd
King Roy
Leydig , Voit & Mayer, Ltd.
Roe Jessee R.
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