Influence of particle velocity and molten phase on the chemical and mechanical properties of HVOF-sprayed structural coatings of alloy 316L
- Daimler Benz Research, Munich (Germany)
- Higher Technical College, Furtwangen (Germany)
- TU Bergakademie, Freiberg (Germany)
The HP/HVOF spraying process allows the production of oxide-low, thick coatings with low porosity. This fact implies the feasibility of load-bearing HP/HVOF-sprayed structures. Optimum mechanical properties are required for structural applications of HP/HVOF-sprayed iron base alloy 316L. Process-parameter-dependent particle properties like temperature and velocity strongly influence the microstructure and the chemical and mechanical properties of HP/HVOF-sprayed alloy 316L. Results of metallographical and chemical analysis and laser-optic-aided particle velocity measurement lead to a new understanding of particle oxidation based on a high volume fraction of liquid phase and high particle impact velocity. The volume fraction of oxides greatly affects the mechanical properties of homogenized HP/HVOF-316 L. Optimum process parameters result in reduced oxide content less than 0.9% and consequently in strength and elongation comparable to that of wrought alloy 316L. Additionally to these excellent mechanical properties, a low porosity level of about 0.1 to 0.2% is achieved. These fundamental results were transferred successfully to a new type of combustion chamber for hypersonic aircraft with reduced complexity and weight.
- OSTI ID:
- 377775
- Report Number(s):
- CONF-9509182--; ISBN 0-87170-541-9
- Country of Publication:
- United States
- Language:
- English
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