Alloy evaluation for fossil fuel process plants (liquefaction). Quarterly report, 1 April-30 June, 1980. [72/sup 0/F to 800/sup +0/F]

Technical Report · Tue Jul 15 04:00:00 EDT 1980

DOI:https://doi.org/10.2172/6923055· OSTI ID:6923055

Woods, C M; Scott, T E

The average thermal expansion coefficient for Carpenter 883 (H-13, the bolt material for bolt loaded compact tension specimens) was determined for the temperature range 72/sup 0/F to 800/sup 0/F. The thermal stability, as a function of time, was determined at 800/sup 0/F. The average thermal expansion coefficients for both A387-74A-Gr.22-Cl.2 steel and 316 stainless steel were determined for the 72/sup 0/F to 1000/sup 0/F temperature range. Thermal stability of A387 at 1000/sup 0/F was monitored for a period of 250 hours. Smooth-bar and notched-bar tensile specimens of A387-74A-Gr.22-Cl.2 steel were exposed to 4000 psig H/sub 2/ gas at 1000/sup 0/F for 168, 250 and 500 hours. Samples were exposed in the unstressed, stressed, and prestrained conditions. Tensile tests were made in air at room temperature at the end of each exposure. Metallographic examinations were made of fracture surfaces as well as other exposed specimens not subjected to the tensile testing. The exposed material exhibited a marked reduction in notch ductility as well as a small reduction in notch tensile strength. The smooth-bar samples showed no significant changes in mechanical properties even after 500 hours of exposure. SEM examinations revealed the presence of small bubbles that formed mostly on or near grain boundaries and in the vicinity of second phase particles. Specimens cleaved at liquid nitrogen temperature exhibited bubbles on the fracture surface. Fatigue crack growth rates (da/dN) were determined for a wide variation of stress intensity range values (..delta..K). Testing was done in hydrogen gas at ambient temperature and various pressures. Near-threshold to rapid crack growth stages were examined.

• Research Organization: Ames Lab., IA (USA)
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 6923055
• Report Number(s): IS-4750
• 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
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-MOLYBDENUM STEELS
CHROMIUM-NICKEL STEELS
COAL LIQUEFACTION
COAL LIQUEFACTION PLANTS
CORROSION RESISTANT ALLOYS
CRACKS
DATA
ELEMENTS
EXPANSION
EXPERIMENTAL DATA
GROWTH
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HYDROGEN
INDUSTRIAL PLANTS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
LIQUEFACTION
MATERIALS
MATERIALS TESTING
MECHANICAL PROPERTIES
METALLURGICAL EFFECTS
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NONMETALS
NUMERICAL DATA
STABILITY
STAINLESS STEEL-316
STAINLESS STEELS
STEEL-ASTM-A387
STEELS
TESTING
THERMAL EXPANSION
THERMOCHEMICAL PROCESSES