Performance of 2-1/4 Cr-1 Mo steel in a coal liquefaction dissolver vessel environment

Thesis/Dissertation · Fri Jan 01 04:00:00 EST 1982

OSTI ID:6238814

Woods, C M

Smooth-bar and notched-bar tensile specimens of bainitic 2-1/4 Cr-1 Mo steel were exposed with and without an applied stress to argon gas or to a coal slurry-H/sub 2/ environment for various conditions of time, temperature and pressure. Room temperature mechanical properties determined after each coal slurry-H/sub 2/ exposure were compared to those of like samples exposed to the same conditions in argon. The coal slurry exposures produced very little change in the room temperature mechanical properties even after 1000 hours at temperatures as high as 426/sup 0/C and total pressures of 27.6 MPa. Corrosion samples were exposed in both the liquid phase and the gaseous phase above the coal slurry-H/sub 2/ environment. Scale growth rates, electron microprobe analyses of the scale region were obtained. Smooth-bar and notched-bar tensile specimens of normalized and tempered (bainitic) 2-1/4 Cr-1 Mo steel were exposed to hydrogen gas at 5.2 to 27.6 MPa in the temperature range from 482/sup 0/ to 593/sup 0/C. Applied stress, plastic deformation and increasing exposure times all lowered the temperature, at any given pressure, for the formation of hydrogen attack bubbles. Fatigue crack growth tests were conducted on normalized and tempered (bainitic) 2-1/4 Cr-1 Mo steel. Crack growth rates were determined for near threshold to intermediate growth rate regions at room temperature and 427/sup 0/C. The results suggest that corrosion products of the coal slurry gases may mitigate the tendency of hydrogen to enhance fatigue crack growth. J integral tests were performed to determine JIC on normalized and tempered (bainitic) 2-1/4 Cr-1 Mo steel. J values were obtained from deep cracked compact tension specimens using single and multiple specimen techniques.

• OSTI ID: 6238814
• 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
ARGON
BAINITE
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
CHEMICAL REACTORS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-MOLYBDENUM STEELS
COAL
COAL LIQUEFACTION
CORROSION
DISPERSIONS
ELEMENTS
ENERGY SOURCES
ENVIRONMENT
ENVIRONMENTAL EFFECTS
FATIGUE
FLUIDS
FOSSIL FUELS
FUEL SLURRIES
FUELS
GASES
HYDROGEN
IRON ALLOYS
IRON BASE ALLOYS
LIQUEFACTION
MATERIALS
MATERIALS TESTING
MECHANICAL PROPERTIES
MECHANICAL TESTS
MIXTURES
NONMETALS
PERFORMANCE
RARE GASES
SLURRIES
STEELS
SUSPENSIONS
TENSILE PROPERTIES
TESTING
THERMOCHEMICAL PROCESSES