DETERMINATION OF THE FORGING CHARACTERISTICS OF NEW AND HIGH TEMPERATURE MAGNESIUM ALLOYS. Period covered April 1, 1956 to June 15, 1957
Technical Report
·
OSTI ID:4336319
This laboratory forging program was established for the purpose of selecting the best Mg alloy or alloys for elevated temperature service. The alloys investigated were three Mg--Th alloys (HM21XA, HK31A, HZ32A) and four Mg-- RE alloys (EK31(M), EZ33A, EK31(Di), EM41XA); two commercial alloys (AZ80A, ZK6OA) were included for comparative purposes. Both cast ingot and extruded billet were used as forging stock. Static properties and creep resistance of the alloys were determined on forged discs of 90% reduction. The data, therefore, cannot be considered as representative of die forgings. Of the alloys investigated, HM21XA-T5 exhibits the best combination of properties in the range of 500 to 7O0 deg F while EK31XA-T6 presents the optimum values at 70 to 500 deg F. Pre-forging cast ingot has no significant effect on the properties of forgings when the final forging reduction is as great as 75%; however, increasing preforging temperature has a deleterious effect on the final forged properties. Evaluation of closed die forgings produced on a 3000 ton press show that ease of forging (die filling) increases in the following order: HM21XA, HK31A, EK31(Di), commercial alloy AZ80A and ZK60A. Temperature and pressure requirements to fill the die for a given alloy increase as the draft angle (7 deg , 3 deg , 0 deg ) decreases. (auth)
- Research Organization:
- Dow Chemical Co., Midland, Mich.
- NSA Number:
- NSA-12-004841
- OSTI ID:
- 4336319
- Report Number(s):
- WADC-TR-57-518; AD-142197
- Country of Publication:
- United States
- Language:
- English
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