Alloy evaluation for fossil fuel process plants (liquefaction). Quarterly report, January 1-March 31, 1979
Room temperature mechanical properties were determined for A387-74A-Gr.22-Cl.2 steel after exposure for 856 hours at 800/sup 0/F in a coal slurry with 4000 psig hydrogen pressure. Comparison of ambient condition tensile tests of the exposed samples with base property data revealed that no degradation of ambient temperature mechanical properties occurred. Examination of an Inconel rupture disc that failed during the attempted 1000 hour slurry-H/sub 2/ exposure revealed considerable pitting and corrosive attack by the environment above the slurry. Cross sectional area measurements of specimens exposed to a coal slurry environment for 856 hours showed inward growth of scale with subsequent loss of sample diameter. Scale growth was considerably greater on stressed samples than on unstressed samples. Microstructural examination of samples from all exposure conditions run to date showed no dramatic changes with the exception of the apparent formation of spherical precipitates near the sample's surface. These have yet to be identified. Scanning electron micrographs were made of the fracture surfaces of unexposed smooth-bar and notched-bar tensile samples and compared to micrographs of like samples exposed for 856 hours in a coal slurry at 800/sup 0/F in 4000 psig H/sub 2/ gas. No apparent change in fracture appearance was noted. The micrographs showed a characteristic ductile-dimple type failure. Spherical particles lying at the base of many of the large voids visible in the fracture surfaces of all the samples examined were analyzed using point source x-ray fluorescence and found to consist of mainly Mn, S, Si and Fe.
- Research Organization:
- Ames Lab., IA (USA)
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 5871728
- Report Number(s):
- IS-4702
- Country of Publication:
- United States
- Language:
- English
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