Thermal measuring and testing – Temperature measurement – Composite temperature-related paramenter
Patent
1992-03-11
1993-02-23
Cuchlinski, Jr., William A.
Thermal measuring and testing
Temperature measurement
Composite temperature-related paramenter
374159, 374102, 374144, G01K 1100
Patent
active
051884577
ABSTRACT:
A method for determining the maximum temperature attained by an article formed of a nickel-based superalloy includes furnishing an article made of a nickel-based superalloy having a gamma/gamma-prime structure at intermediate temperatures and a single phase structure at high temperatures and characterized by a predetermined continuous relation between equilibrium volume fraction of gamma prime phase present and temperature over a transition temperature range. The article is heated with a temperature profile including a maximum temperature within the transition temperature range, and thereafter cooled to ambient temperature to produce a distribution of coarse gamma-prime particles and fine gamma-prime particles in a gamma matrix. The fraction of coarse gamma-prime particles present in the article is measured, and compared with the predetermined continuous relation between equilibrium volume fraction of gamma-prime phase as a function of temperature, to determine a maximum temperature reached by the article. In one useful form, the material having the gamma/gamma-prime structure is provided as a temperature marker that is fixed to the article to be measured, as in the form of a pin or a coating.
REFERENCES:
patent: 3415122 (1968-12-01), Yee
patent: 3483748 (1969-12-01), Rogen et al.
patent: 3839898 (1974-10-01), Talboom, Jr. et al.
Cuchlinski Jr. William A.
General Electric Company
Gutierrez Diego F. F.
Maria Carmen Santa
Squillaro Jerome C.
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