Affiliation:
1. Chonnam National University
2. POSCO
3. Chonam National University
Abstract
The present paper reports the results of microcreep tests and microstructure of alloy 617
foils of 100μm thick specimens at 800 and 900 oC in air. Before each test, the specimens were
annealed in vacuum at 950 oC for 17 hrs. The dynamic recrystallizations were observed during
creep test. The voids and cracks were observed along grain boundaries. The maximum elongation of
grains was found at the lowest applied stress along the loading direction. The average grain size
decreases from 20 μm to 2 μm as applied stress increases from 48 to 120 MPa at 800 oC and from
50 μm to 5 μm as the applied stress increases from 35 to 60MPa at 900 oC. The steady state creep
rates were increased as applied stress increased in all the specimens.
Publisher
Trans Tech Publications, Ltd.
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