This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Resistance of Automotive Exhaust Flexible Coupling Alloys to Hot Salt Attack, Stress Corrosion Cracking and High Temperature Embrittlement
Technical Paper
1999-01-0372
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Automotive exhaust system flexible couplings must resist fatigue and a variety of corrosion mechanisms resulting from exposure to road salts. Increasing operating temperatures and extended warranties are creating ever higher demands on flexible coupling materials. In addition to corrosion and fatigue resistance, materials must have good metallurgical stability. This translates to retention of initial mechanical properties after extended operation at high temperature.
Comparative time-temperature hot salt attack profiles were determined for several austenitic stainless steels and nickel base alloys over the temperature range of 430-870°C (800-1600°F) for times of 0 to 1,333 hours. Temperature and alloy composition regimes where stress corrosion cracking (SCC) can occur are also outlined. In addition, the effect on mechanical properties of 300 to 2,000 hour exposures at the above temperatures is determined. Results of these tests are related to alloy composition and calculated equilibrium phase constitutions.
Recommended Content
Authors
Citation
Crum, J., Smith, G., and Flower, H., "Resistance of Automotive Exhaust Flexible Coupling Alloys to Hot Salt Attack, Stress Corrosion Cracking and High Temperature Embrittlement," SAE Technical Paper 1999-01-0372, 1999, https://doi.org/10.4271/1999-01-0372.Also In
References
- Bologna D. J. “Materials for Exhaust Systems,” ASM Technical Report System No. 76-58 ASM International Materials Park, OH 1976
- Douthett J. A. “Designing Stainless Exhaust Systems” Automotive Engineering November 1995
- Smith G. D. et. al. “Alloy Optimization for Enhanced Flexible Coupling Performance” SAE Technical Paper “Series, No. 960578 SAE International Warrendale, PA 1996
- Saunders N. Thermo Tech Ltd. U.K.
- Smith G. D. et. al. “High Temperature Corrosion Performance of Automotive Coupling Alloys” Paper No. 742, CORROSION 98 San Diego, CA 1998
- Crum J. R. et. al. “Development of a New Nickel Containing Alloy for Flexible Exhaust Couplings” Paper No. 743, CORROSION 98 San Diego, CA 1998