Fatigue tests of un-HIP'ed γ-TiAl engine valves for motorcycles
✍ Scribed by M. Badami; F. Marino
- Publisher
- Elsevier Science
- Year
- 2006
- Tongue
- English
- Weight
- 840 KB
- Volume
- 28
- Category
- Article
- ISSN
- 0142-1123
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✦ Synopsis
This paper presents some fatigue test results on motorcycle valves obtained by permanent-mould cast g-TiAl alloy, which is an excellent alternative material for engine valves because of its low density and elevated temperature strength. Since the production and machining of g-TiAl valves are very expensive, particular care was paid to meeting reliability requirements while trying to reduce costs. The development of high quality low-cost g-TiAl alloy engine valves was obtained without performing a hot isostatic pressing (HIP) process. The valves were mounted onto an actual motorcycle engine and a racing-type fatigue test was then positively overcome. A contribution to the evaluation of the effect of the intrinsic defects that are typical of centrifugal mould technology on the fatigue behaviour of castings was also given.