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Before discussing the pyrometric procedure practiced by the Babcock & Wilcox Co. in elevated temperature testing, it would be well to define the interests and the types of testing conducted at the Babcock & Wilcox Research Center. Most of the alloys under study are intended for use in superheater service with an estimated life of 20 to 25 yr. Since deformation is less important for these structural components than rupture life, the main emphasis in this 136-station high-temperature laboratory is on rupture testing. However, creep tests are also conducted on materials that have displayed satisfactory rupture characteristics. In determining basic curves, stress-rupture tests are conducted from 0 time to 10,000 hr, or longer, and for determining creep curves, the tests are conducted for a minimum time interval of 10,000 hr. The test temperatures for alloy development and for standard materials intended for superheater service fall in the range of 850 to 1500 F. This summary will include the procedure used for preparing thermocouples, the method of measuring temperature, the types of furnace controls employed, and an analysis of the resulting temperatures.
Leyda, W. E.
Senior Test Engineer, Research Center, The Babcock & Wilcox Co., Alliance, Ohio