Microstructural Changes during High Temperature Service of a Cobalt-Based Superalloy First Stage Nozzle

Table 2

Quantitative microstructure in different zones of the nozzle vanes.

Microstructural parameter	Zone A	Zone B	Zone C	Zone D
	Temperature [°C]
	693	560	907	934
Average grain size [µm]	313	54	401	531
Volume fraction of carbides [%]	7.36	0.72	10.22	12.96