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Alloy Optimization for Enhanced Flexible Coupling Performance
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English
Abstract
Flexible couplings are becoming increasingly important in the design and performance of automotive exhaust systems. Higher temperatures, tighter emission requirements along with extended warranties and governmental demands for increased gas mileage are rendering typically selected coupling alloys marginally acceptable or, more often, unacceptable for a growing number of engine platforms. Requirements for longer life are demanding improvements in fatigue and corrosion properties over those of currently employed alloys. This paper describes the optimization of the fatigue properties of alloy 625 for use in automotive flexible couplings. The salt corrosion resistance of typically used 321SS is then compared to that of INCONEL* alloy 625LCF* and two other candidate flexible coupling alloys, INCOLOY* alloys 800 and 825. INCONEL alloy 625LCF is shown to meet the performance requirements of this critical exhaust system component.
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Citation
Smith, G., Crum, J., and Smith, R., "Alloy Optimization for Enhanced Flexible Coupling Performance," SAE Technical Paper 960578, 1996, https://doi.org/10.4271/960578.Also In
References
- Smith, G. D. Tassen, C. S. “Optimization of Low Cycle Fatigue of a Wrought High Nickel Alloy,” Proceedings of International Symposium on Superalloys 718, 625 and Various Derivatives Pittsburgh, PA June 1991
- Ganesan, P. Renteria, C. M. Crum, J. R. “Versatile Corrosion Resistance of INCONEL alloy 625,” Proceedings of International Symposium on Superalloys 718, 625 and Various Derivatives Pittsburgh, PA June 1991
- Bologna, D. J. “Materials for Exhaust Systems,” ASM Technical Report System No. 76-58 ASM Metals Park OH 447073 1976