Sulfidation-resistant alloy for coal gasification service. Monthly report, October 1-October 31, 1977. [Fe-18Cr-5Al-1Mo-1Hf]

Technical Report · Thu Nov 10 00:00:00 EST 1977

OSTI ID:6567858

Perkins, R A; Bhat, M S

Work on the program except for a few mechanical tests of Phase II candidate alloys has been stopped due to lack of material required for the Phase III evaluation. The program (Phase III) is now a total of five months behind schedule. Progress reports are presented for Tasks I and II, design for sulfidation resistance, and design for mechanical behavior. Some of the accomplishments are: Task I - Samples of an Fe-18Cr-5Al-1Mo-1Hf alloy have been tested in two high pressure runs at IITRI. Two samples showed little attack after 1000 h at 1650/sup 0/F in the DOE/MPC gas mixture with 1% H/sub 2/S. The samples currently are being exposed for a second 1000 h run. Two additional samples have been exposed for 1000 h at 1500/sup 0/F in a low Btu gas mixture. Details of the test conditions and results were not available at this time and will be presented in the quarterly report next month. Task II - A summary of impact data for Fe-Cr-Al-Mo alloys is presented in graphs 1 to 3. Graph 1 indicates that increasing Al decreases the notch impact strength. However, when compared with graph 2 which shows the differences between 17 and 18 Cr steels at the low Al (4%) level, the effect does not appear to be real. All materials have the same transition temperature based on a 50% reduction in impact strength. The variation in strength at 100/sup 0/C is not consistent with Al and Cr composition variations and may be a scatter in data due to other composition and structure variables. Graph 3 shows the effect of Mo additions on behavior. Alloys with 2 to 4 Mo have 3 to 6 times the impact strength of the Mo-free alloys at 100/sup 0/C. Two alloys were analyzed for impurities that could affect impact behavior and results are presented. 1 reference, 3 figures.

• Research Organization: Lockheed Palo Alto Research Labs., CA (USA); California Univ., Berkeley (USA)
• DOE Contract Number: AC01-76ET10675
• OSTI ID: 6567858
• Report Number(s): DOE/ET/10675-T1; FE-2299-17; ON: DE84017375
• Resource Relation: Other Information: Portions are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
01 COAL, LIGNITE, AND PEAT
ALLOY-TZM
CORROSION PROTECTION
ALUMINIUM ALLOYS
CORROSION RESISTANCE
IMPACT STRENGTH
CHROMIUM ALLOYS
COAL GASIFICATION PLANTS
HAFNIUM ALLOYS
HYDROGEN SULFIDES
CORROSIVE EFFECTS
IRON BASE ALLOYS
MOLYBDENUM ALLOYS
EXPERIMENTAL DATA
MEDIUM PRESSURE
TEMPERATURE DEPENDENCE
TESTING
VERY HIGH TEMPERATURE
ALLOYS
CHALCOGENIDES
DATA
HYDROGEN COMPOUNDS
INDUSTRIAL PLANTS
INFORMATION
IRON ALLOYS
MECHANICAL PROPERTIES
MOLYBDENUM BASE ALLOYS
NUMERICAL DATA
SULFIDES
SULFUR COMPOUNDS
TITANIUM ALLOYS
ZIRCONIUM ALLOYS
360105* - Metals & Alloys- Corrosion & Erosion
010404 - Coal
Lignite
& Peat- Gasification