REFINEMENT OF Cr-Mo-V STEEL BY CERIUM

Journal Article · Mon Apr 01 04:00:00 EST 1963 · Liteinoe Proizv.

OSTI ID:4714176

Trusov, L P; Kumanin, V I

The effect of Ce on the properties of a pearlitic heatresistant steel for service at 580 and 240 deg C was investigated. Cerium was added as mischmetal (50% Ce, 25% La, 15% Nd, and 10% other rare earth metals) either in furnace or ladle. It was found that 0.20% Ce decreased the total S content, made the sulfide distribution more uniform, and reduced nonmetallic impurities by 30 to 45% and O content by more than 50%. For tests of mechanical properties, the steel was anneaied at l080 to 1100 deg C for 2 hr, aged at 740 to 750 deg C for 5 hr, and air-cooled. The addition of 0.20% Ce was found to increase the yield strength and tensile strength at 580 deg C from 38.2 to 41.5 to 42.1 kg/mm/sup 2/ and from 43.5 to 46 to 46.7 kg/mm/sup 2/, respectively. However, the highest notch toughness at room temperature, 13.2 to 16.2 kg/cm/sup 2/, was obtained at 0.50 to 0.10% Ce. Also, the longest rupture life, 1255 or 563 hrs, at 580 deg C under a stress of 20 kg/mm/sup 2/ was obtained with 0.05% Ce added in furnace or in ladle, respectively. In both cases the fracture was intergranular, while nonmodified steel had a transgranular fracture. The creep strength at 580 deg C and a creep rate of 10/sup -5/% per hr were found to be 7 kg/mm/sup 2/ compared with 6 kg/mm/sup 2/ for the nonmodified steel. Oxidation resistance of the Ce- modified steels at 600, 650, and 700 deg C was found to be lower than that of the unmodified metal. (OTS)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-17-027859
• OSTI ID: 4714176
• Journal Information: Liteinoe Proizv., Journal Name: Liteinoe Proizv. Vol. Vol: No. 4
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

CERIUM ALLOYS
CHROMIUM ALLOYS
CREEP
DISTRIBUTION
FAILURES
GRAIN BOUNDARIES
HEAT TREATMENTS
LANTHANUM ALLOYS
MECHANICAL PROPERTIES
METALS, CERAMICS, AND OTHER MATERIALS
MOLYBDENUM ALLOYS
NEODYMIUM ALLOYS
OXIDATION
OXYGEN
QUANTITY RATIO
RARE EARTHS
REFINING
SULFUR
TEMPERATURE
TENSILE PROPERTIES
VANADIUM ALLOYS