Alloy evaluation for fossil fuel process plants (liquefaction). Annual report October 1, 1978-September 30, 1979

Technical Report · Thu Nov 01 04:00:00 EST 1979

DOI:https://doi.org/10.2172/5821342· OSTI ID:5821342

Woods, C M; Scott, T E

Room temperature mechanical properties were determined for A387-74A-Gr.22-Cl.2 steel after various environmental exposures. Exposure conditions include 168 hours at 500 or 800/sup 0/F in a coal slurry with 4000 psig hydrogen pressure, 1000 hours at 800/sup 0/F in 4000 psig argon, or 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. Microstructural examination of samples from all exposure conditions run to data showed no dramatic changes with the exception of the formation of a multilayer scale on the surface of samples exposed to the coal slurry environment. Point source x-ray fluorescence and electron microprobe analyses were carried out on these layers along with the parent metal. The relative Fe, Cr, Mo, Mn, S, and Si concentrations were determined and a profile plotted. 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. Fracture surfaces of samples exposed to the slurry exhibited considerably larger voids than those of unexposed samples. 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.

• Research Organization: Ames Lab., IA (USA)
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 5821342
• Report Number(s): IS-4717
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
36 MATERIALS SCIENCE
360103 -- Metals & Alloys-- Mechanical Properties
ALLOYS
COAL LIQUEFACTION PLANTS
ELONGATION
INDUSTRIAL PLANTS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MATERIALS TESTING
MECHANICAL PROPERTIES
METALLOGRAPHY
STEEL-ASTM-A387
STEELS
TENSILE PROPERTIES
TESTING