Automotive Application of Advanced Superalloys |
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| Authors: | Masashi Yoritaka Yukio Yamamoto Yasuaki Hasegawa Tomio Hokari |
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| Affiliation: | 1. Technical Research Center of the Mazda Motor Corporation, Japan
2. Development Department at the Sawa Works of Hitachi Ltd., Japan
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| Abstract: | Based on the testing reported here, a new Ni-based superalloy has been adopted for use in Mazda RX-7 heat-resistant turbochargers. The new alloy exhibits a high temperature stability of the γ phase, resisting the initial stage of creep rupture. Casting parameters and chemistries are varied to produce a directionally solidified columnar structure, which eliminates internal grain boundary rupture sites. The Mazda super-high temperature turbocharger was used to achieve a world speed record (GT-C class) of 238.442 mph at Bonneville, Utah, last August. |
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