EFFECT OF SURFACE FINISH ON PROPERTIES OF BERYLLIUM SHEET

Journal Article · Wed Mar 01 04:00:00 EST 1961 · Trans. Am. Soc. Metals

OSTI ID:4815040

Ward, W V; Jacobson, M I; Matthews, C O

The effect of various surface finishes on the mechanical properties of beryllium sheet was investigated. As-received, surface-ground, milled, shot- peened, and etched surfaces were evaluated by tension tests (at room, subzero, and elevated temperatures), notched tensile tests, fatigue tests, and impact tests. Metallographic examination re vealed surface and subsurface defects in all specimens except those with etched surfaces. The beryllium specimens that were etched to remove surface defects caused by machining were found to have the best mechanical properties. Ductility was low in all cases, being limited by the presence of notches and by preferred orientation in the sheet. Heating in the range of 400 to 600 deg F (205 to 315 deg C) caused increased ductility. The fatigue endurance limit was equivalent to the static tensile strength and was found to be improved by etching. Of the tests employed, impact tests provided the best distinctions of the degree of surface damage among the various surfaces. Residual compressive stresses were present at the surface of as-received, ground, and milled sheet. (auth)

• Research Organization: Wright Air Div., Wright=Patterson AFB, Ohio
• NSA Number: NSA-16-025812
• OSTI ID: 4815040
• Journal Information: Trans. Am. Soc. Metals, Journal Name: Trans. Am. Soc. Metals Vol. Vol: 54
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

BERYLLIUM
CLEANING
COLD WORKING
DEFECTS
DUCTILITY
ETCHING
FATIGUE
HEATING
HIGH TEMPERATURE
IMPACT SHOCK
LOW TEMPERATURE
MACHINING
MECHANICAL PROPERTIES
METALLOGRAPHY
METALS, CERAMICS, AND OTHER MATERIALS
SHEETS
SURFACES
TEMPERATURE
TENSILE PROPERTIES
TESTING
VARIATIONS