FORGING CHARACTERISTICS AND PROPERTIES OF HM21XA AND EK31XA MAGNESIUM ALLOY PRODUCTION FORGINGS. Period covered : May 16, 1957 to June 30, 1958
Technical Report
·
OSTI ID:4276175
This production closed-die forging program was established for the purpose of determining the forging characteriatics and properties of two high- temperature magnesium alloys, HM21XA and EK31XA, in five sets of commercial design tools. Both cast and extruded material was used as forging stock. Teat specimens for room and elevated temperature testing were taken from the forgings in normal production test locations after the HM21XA forgings were aged to the - T5 temper and the EK31XA forgings were heat treated to the -T6 condition. EK31XA alloy is readily forgeable in regular hydraulic presses and the Air Force heavy presses with stock temperatures of 750 to 950 deg F and die temperatures of 700 to 850 deg F. HM21XA alloy is relatively stiff to forge in this temperature range and the alley is also susceptible to cracking when subjected to bending moments during the forging cycle. The cast forms of both alloys are slightly stiffer to forge than the extruded forms. The strength properties and creep resistance of EK3lXA,-T6 production forgings are outstanding st temperatures to 500 deg F. Properties of HM21XA-T5 forgings, although lower than anticipated st moderste temperatures, duplicate those obtained on laboratory muterial at the higher testing temperatures. Optimum properties are obtained in this alloy by strain hardering and maintaining the Mn content at about 0.60%. Modulus, shear, bearing, and fatigue properties for both alloys are presented at appropriate testing temperatures. (auth)
- Research Organization:
- Dow Chemical Co., Midland, Mich.
- NSA Number:
- NSA-13-005582
- OSTI ID:
- 4276175
- Report Number(s):
- WADC-TR-58-218; AD-204797
- Country of Publication:
- United States
- Language:
- English
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