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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2021.1
- 수록면
- 2,416 - 2,429 (14page)
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초록· 키워드
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When alloys are exposed to elevated temperatures they experience a decrement in their mechanical properties that leadsto material failure. However, the use of thixoforming, an alternative metal processing method, could enhance mechanicalproperties by minimising the defects that exist in as-received alloys. Therefore, this study aimed to determine the tensilestrength of thixoformed A319 under elevated temperatures by taking into account its intended use in vehicle cylinder headcomponents. Thixoformed A319 was compared with as-received alloy manufactured by permanent mould casting. Thecooling slope method was used to prepare the feedstock for thixoforming. The feedstock was reheated by induction heatinguntil it reached 574 °C and was then formed in a mould. Afterwards, the as-received and thixoformed samples underwentT6 heat treatment. The resulting samples were characterised by using optical microscopy, scanning electron microscopyequipped with energy dispersive X-ray, X-ray difraction analysis and a tensile test. Elevated temperature tensile tests wereperformed at 250 °C, in line with the temperature condition experienced by cylinder head components during operation. The ultimate tensile strength of the thixoformed samples was 30% higher than that of the as-received samples under elevatedtemperatures. Also, the analyses of the fracture surfaces showed that porosity, intermetallic compounds and impurities wereamongst the failure factors for both alloys.
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