Formation of iron aluminide coatings on plain carbon steel by TIG process

Considerable effort has been directed toward an improved understanding of the production of the strong and stiff ∼ 1-20 μm diameter pyrolytic carbon fibers of the type reported by Koyama and, more recently, by Tibbetts. These macroscopic fibers are produced when pyrolytic carbon filaments (∼ 0.1 μm or less in diameter) are thickened by deposition of carbon during thermal decomposition of hydrocarbon gases. Each such precursor filament normally lengthens in association with an attached catalyst particle. The subject of filamentous carbon formation and much of the work on characterization of the catalyst particles have been reviewed thoroughly by Baker and Harris. However, identification of the catalyst particles remains a problem of continuing interest. The purpose of this work was to characterize the microstructure of the pyrolytic carbon filaments and the catalyst particles formed inside stainless steel and plain carbon steel tubes. For the present study, natural gas (∼; 97 % methane) was passed through type 304 stainless steel and SAE 1020 plain carbon steel tubes at 1240°K.

Download Full-text

SAE 1025

Alloy Digest ◽

10.31399/asm.ad.cs0114 ◽

1987 ◽

Vol 36 (9) ◽

Keyword(s):

Fracture Toughness ◽

Carbon Steel ◽

Heat Treating ◽

Plain Carbon Steel ◽

General Purpose ◽

Pressure Vessels ◽

Permanent Mold ◽

Steel Mills ◽

Cold Worked ◽

Permanent Mold Castings

Abstract SAE 1025 is a plain carbon steel for general-purpose construction and engineering. It is used in the hot-worked, cold-worked, normalized or water-quenched-and-tempered condition. It also is carburized and used for case-hardened parts. Its many uses include bolts, forgings, axles, machinery components, cold-extruded parts, pressure vessels, case-hardened parts, chain and sprocket assemblies, spinning tools and permanent-mold castings. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: CS-114. Producer or source: Carbon steel mills.

Download Full-text

Effects of Prior Austenite and Ferrite Grain Size on Fracture Properties of a Plain Carbon Steel.

10.21236/ada146276 ◽

1984 ◽

Cited By ~ 2

Author(s):

H. Couque ◽

J. Duffy ◽

R. J. Asaro

Keyword(s):

Grain Size ◽

Carbon Steel ◽

Prior Austenite ◽

Plain Carbon Steel ◽

Fracture Properties ◽

Ferrite Grain Size

Download Full-text

Study of the Role of Small Additions of Zr in the CVD- FBR Aluminization Process

Defect and Diffusion Forum ◽

10.4028/www.scientific.net/ddf.289-292.293 ◽

2009 ◽

Vol 289-292 ◽

pp. 293-300

Author(s):

L. Sánchez ◽

F.J. Bolívar ◽

M.P. Hierro ◽

F.J. Pérez

Keyword(s):

Fluidized Bed ◽

Vapor Deposition ◽

Chemical Vapor ◽

Fluidized Bed Reactor ◽

Iron Aluminide ◽

Martensitic Steels ◽

Aluminide Coatings ◽

Deposition Parameters ◽

Zirconium Powder

In this work, iron aluminide coatings were developed by Chemical Vapor Deposition in Fluidized Bed Reactor (CVD-FBR) on ferritic-martensitic steels. Small additions of zirconium powder were introduced in the fluidized bed; as a consequence, the obtained coatings are thicker than that without zirconium additions. When Zr powders are added in the fluidized bed, the deposition atmosphere drastically changes, leading to increase the deposition rate. Thermodynamic calculations were carried out to simulate the modifications in the CVD atmosphere in the Al/Zr deposition system in comparison to the single aluminization. In order to optimize the conditions of the deposition, parameters such as temperature and concentration of zirconium introduced into the bed were evaluated and compared with the results obtained for the single aluminum deposition.

Download Full-text