Accession Number : AD0475016

Title :   FURTHER INVESTIGATION OF NOTCH SENSITIVITY OF REFRACTORY METALS.

Descriptive Note : Technical rept. 1 Apr 64-30 Jun 65,

Corporate Author : BATTELLE MEMORIAL INST COLUMBUS OH

Personal Author(s) : Marschall, C. W. ; Holden, F. C. ; Gilbert, A. ; Wilcox, B. A.

Report Date : AUG 1965

Pagination or Media Count : 64

Abstract : The effects of commercially available coatings on the fracture toughness of a columbium alloy, D43, and a molybdenum alloy, TZM, were studied in Phase I. The 30-mil sheet alloys TZM and D43 were coated with Chromalloy W-3 and TRW (Cr-Ti-Si), respectively. Test results on as-coated specimens and specimens that were coated and exposed in air at elevated temperature revealed that there was no serious deterioration in notch strength or fracture toughness. The notch sensitivity and brittleness of molybdenum sheet were studied in Phase II by the following related investigations: (1) the effect of strain rate on the flow and fracture of molybdenum; (2) determination of the limiting temperature for the propagation of a brittle crack, by use of a modified Robertson 'crack arrest' test; and (3) application of the Moire technique to study local strains at the root of a notch. (Author)

Descriptors :   (*MOLYBDENUM ALLOYS, NOTCH SENSITIVITY), (*NIOBIUM ALLOYS, NOTCH SENSITIVITY), (*REFRACTORY METAL ALLOYS, NOTCH SENSITIVITY), FRACTURE(MECHANICS), TOUGHNESS, BRITTLENESS, REFRACTORY COATINGS, SHEETS, TENSILE PROPERTIES, MECHANICAL PROPERTIES, HEAT TREATMENT, STRAIN(MECHANICS), LOADS(FORCES), FATIGUE(MECHANICS).

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE