Comparison of the microstructure and mechanical properties of 300-M steel manufactured by the vacuum arc remelt and the electroslag remelt processes

The transverse (T-L) and longitudinal (L-T) mechanical properties of Electroslag Refined (ESR) and Vacuum Arc Remelt (VAR) 300-M steel were measured. These were related to the microstructural and chemical differences which resulted from the two melting processes. It was found that the ESR process resulted in a cleaner steel. Impurity elements were reduced and inclusions were finer and more evenly dispersed. The Charpy impact energies of the ESR steel were nearly doubled those of the VAR. Also the fracture toughness of the ESR 300-M showed no temper embrittlement in the 350 to 500/sup 0/C tempering range whereas that of the VAR material did

High-temperature gas-cooled reactor helium compatibility studies: results of 10,000-hour exposure of selected alloys in simulated reactor helium

Work on the HTGR Helium Compatibility Task accomplished during the period March 31, 1977 through September 30, 1979, is documented in this report. Emphasis is on the results and analyses of creep data to 10,000 h and the detailed metallurgical evaluations performed on candidate alloy specimens tested for up to 10,000 h. Long-term creep and unstressed aging data in controlled-impurity helium and in air at 800, 900, and 1000/sup 0/C are reported for alloys included in the program in FY-76, including the wrought solid-solution-strengthened alloys, Hastelloy X, Hastelloy S, RA 333, and HD 556, and the centrifugally cast austenitic alloys, HK 40, Supertherm, Manaurite 36X, Manaurite 36XS, and Manaurite 900