Classifications

• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C37/00—Cast-iron alloys
  • C22C37/10—Cast-iron alloys containing aluminium or silicon
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
  • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
  • F01N13/08—Other arrangements or adaptations of exhaust conduits
  • F01N13/10—Other arrangements or adaptations of exhaust conduits of exhaust manifolds
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
  • F01N2530/00—Selection of materials for tubes, chambers or housings
  • F01N2530/06—Aluminium or alloys thereof

Definitions

• the invention relates to an exhaust manifold or a turbocharger housing made of a FeAl steel alloy and the use of FeAl steel alloy for the production of exhaust manifolds or turbocharger housings.
• the exhaust manifold is a component of the exhaust system of internal combustion engines. Screwed directly to the engine, the manifold directs the exhaust into the exhaust.
• the manifold has its name from its usually curved design, since this must divert the exhaust gases from the mostly horizontal engine openings in the downstairs exhaust system. Alloyed cast iron is often used as the material, which meets the high temperatures of the exhaust gases (over 900 ° C). Alternatively, built-in manifolds made of stainless steel are used.
• a challenge in the development of elbows is the consideration of the temperature expansion and the associated stress distribution in the manifold. These voltages are usually so great that they destroy the manifold after a finite number of heating-cooling cycles. Nevertheless, today manifolds are developed that survive several thousand such cycles, which corresponds to a distance of several hundred thousand kilometers.
• the manifold of two-stroke engines ensures that an exhaust gas pressure can build up in the engine. In four-stroke engines, however, it serves as a pure transition.
• a turbocharger serves to increase the performance of piston engines by increasing the mixture throughput per stroke.
• a turbocharger consists of an exhaust gas turbine in the exhaust gas flow, which is connected via a shaft to a compressor in the intake tract. The turbine is set in rotation by the exhaust gas flow of the engine and thus drives the compressor. The compressor increases the pressure in the intake tract of the engine, so that during the intake stroke, a larger amount of air enters the cylinder as in a naturally aspirated engine.
• the said components of the turbocharger are comprised of a housing that communicates directly with the engine and supplies the exhaust gas to the turbine.
• Other types of turbochargers include biturbo and twin turbo, sequential biturbo, Register charging and multi-stage charging as well as turbo compounds.
• a common feature of the aforementioned embodiments of turbochargers for the purposes of the invention is that they all comprise a housing section which serves to guide the hot exhaust gas.
• the FeAl steel alloy used in the present invention is characterized, inter alia, by having a density in the range of 6.3 to 6.5 g / cm 3 , whereas conventional cast steels are about 7.1 to 7.4 g / cm 3 .
• the FeAl steel alloys according to the invention also show a lower thermal conductivity (9 to 18 W / m * K at 100 to 800 ° C) than conventional steels and cast iron (about 30 to 70 W / m * K at 50 to 600 ° C). In addition, they have a significantly higher strength at application temperatures, in particular at temperatures above 500 ° C, than conventional steels same use. FeAl steel alloys also show no scaling up to 1100 ° C and therefore have improved oxidation resistance compared to conventional steels. Overall, the use of FeAl steel grades can reduce exhaust heat loss and component weight, and increase strength and oxidation resistance under operating conditions.
• the proportion of Al in the FeAl steel alloy is preferably 15 to 17% by weight, in particular 16% by weight, since the Fe 3 Al phases which are particularly suitable for the purposes according to the invention are present to a considerable extent in the steel.
• the proportion of B in the FeAl steel alloy is 10 to 100 ppm. Particularly preferred is a combination of said preferred proportions for B and Al.
• the proportion of the elements of group C, Ti, Zr, Si and V is at most 5 wt.%, Wherein the proportion by weight of individual elements in the alloy is at most 1 wt.%.
• a combination with the said preferred proportions for B and / or Al is particularly preferred.
• the mentioned preferred FeAl steel alloys have a high mechanical strength, especially at high temperatures, coupled with excellent oxidation resistance.
• the FeAl steel alloys mentioned are particularly suitable for use in the production of exhaust manifolds or turbocharger housings for internal combustion engines. These uses represent a further aspect of the invention.
• the production of the steel alloy used according to the invention can be carried out by casting.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Exhaust Silencers (AREA)
• Supercharger (AREA)

Priority Applications (1)

Applications Claiming Priority (1)

Publications (1)

Family

ID=40765684

Family Applications (1)

Country Status (1)

Citations (2)

• 2009
  • 2009-04-10 EP EP09005267A patent/EP2239349A1/fr not_active Withdrawn

Patent Citations (2)

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