High temperature materials for heavy duty diesel engines: Historical and future trends

A steel material has the following composition in weight-%: C C+N Si Mn Cr Mo V min 0,05 0,05 0,01 0,01 0,01 0,01 0,01 max 5 8 4 15 40 15 20 and possibly one or more of the following accessory alloying elements : Ni W Nb Co Ti Zr Cu Al S Ca (ppm) O (ppm) min 3 10 max 40 15 15 20 5 5 5 1 1 75 100 balance essentially only Fe and possible impurities. The material is manufactured by granulation of the melt having the above composition by making a jet of the melt hit a refractory target and be disintegrated into droplets, which are allowed to fall down into a container containing a cooling medium, so that they are quenched to a granulate with a lobate to round shape and a size of 0.5 mm to 20 mm. The quenched granulate is filled into a capsule, and the capsule with the granulate is hot isostatically pressed alternatively hot extruded close to completely dense body.

Steel material and a method for its manufacture

A wear-resistant material which comprises certain concentrations of carbon, nitrogen, oxygen, niobium/tantalum as well as other metallic elements. The material comprises a metal matrix and hard phases embedded therein. The hard phases comprise one or more of carbides, nitrides, carbonitrides, and oxide carbonitrides and have a diameter of from about 0.2 μm to about 50 μm. This abstract is neither intended to define the invention disclosed in this specification nor intended to limit the scope of the invention in any way.

Wear-resistant material

An improved stationary roller shaft of a gear assembly for an air turbine starter is provided. The air turbine starter may be used to start a gas turbine engine, such as may be found in aircraft, ships and military vehicles. The stationary roller shaft is formed of a material having a hardness of at least 66 Rockwell C and having a low inclusion content rating, thereby providing improved wear and/or fatigue properties.

Stationary roller shaft formed of a material having a low inclusion content and high hardness

An iron-based alloy includes, in weight percent, carbon from about 2 to about 3 percent; manganese from about 0.1 to about 0.4 percent; silicon from about 0.3 to about 0.8 percent; chromium from about 11.5 to about 14.5 percent; nickel from about 0.05 to about 0.6 percent; vanadium from about 0.8 to about 2.2 percent; molybdenum from about 4 to about 7 percent; tungsten from about 3 to about 5 percent; niobium from about 1 to about 3 percent; cobalt from about 3 to about 5 percent; boron from zero to about 0.2 percent; and the balance containing iron and incidental impurities. The alloy is suitable for use in elevated temperature applications such as in valve seat inserts for combustion engines.

Iron-based alloys and methods of making and use thereof

A powder metallurgy corrosion and wear resistant tool steel article, and alloy thereof. The article is manufactured by hot isostatic compaction of nitrogen atomized, prealloyed high-chromium, high-vanadium, high-niobium powder particles. The alloy is characterized by very high wear and corrosion resistance, making it particularly useful for use in the manufacture of components for advanced bearing designs as well as machinery parts exposed to severe abrasive wear and corrosion conditions, as encountered, for example, in the plastic injection molding industry and food industry.

Corrosion and wear resistant alloy

An Fe-Ni-based alloy that has improved wear resistance at high temperature over Ni-based superalloys is provided The alloy is particularly useful for manufacturing engine exhaust valves and other high temperature engine components subjected to corrosion, wear and oxidation

Wear resistant high temperature alloy

A powder-metallurgy produced high-speed steel article having a combination of high hardness and wear resistance, particularly at elevated temperatures. This combination of properties is achieved by the combination of W, Mo, V, and Co. The article is particularly suitable for use in the manufacture of gear cutting tools, such as hobs, and surface coatings.

High hardness powder metallurgy high-speed steel article

A fully dense, powder-metallurgy produced maraging steel alloy article of prealloyed powder for use as a tool for high temperature applications. The article in the as-produced condition having a hardness less than 40 HRC to provide machinability and thereafter the article upon maraging heat treatment having a hardness greater than 45 HRC. A method for producing this article comprises compacting prealloyed powder to produce a fully dense article having a hardness less than 40 HRC and thereafter maraging heat treating to a hardness greater than 45 HRC.

A maraging steel article and method of manufacture

A powder metallurgy cold-work tool steel article of hot isostatic compacted nitrogen atomized, prealloyed powder. The alloy of the article includes the addition of niobium, which combined with the use of gas atomization, results in a fine carbide size distribution. This in turn results in improved bend fracture strength and impact toughness. In addition, as a result of isostatic compaction of nitrogen gas atomized prealloyed powder a fine distribution of carbides results to obtain a microstructure that achieves both improved toughness and wear resistance.

Wojcieszynski Andrzej L

Papers

Corrosion and wear resistant alloy

Wear resistant high temperature alloy

High hardness powder metallurgy high-speed steel article

A maraging steel article and method of manufacture

Cold-work tool steel article