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The structure of the alphinizing coat on alloy steels

Pietrowski S., Szymczak T.

Archives of Foundry Engineering

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2008

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Vol. 8, iss. 4

229-235

EN

In this paper results of the structure of the coat alphinizing in AlSi5 silumin on alloy steels: acid-proof 1H18N9T (X6CrNiTi18-10) and high speed SW18 (HS18-0-1) were presented. The temperature of the alphinizing bath was amounts to750š5°C, and immersion time of the element [tau] = 180s. It was shown, that there is the different "g" coat thickness on testing steels. On the 1H18N9T steel it amounts to g = 52[mikro]m, and on the SW18 steel - g = 203[mikro]m. Regardless of a grade of testing alloy steels the coat consist of three layers with diversified phasic structure. There is different chemical composition of coat layers on testing steels. The first layer from the base consist of AlFe phase containing alloy addictions of steels: Cr and Ni (1H18N9T) and W, V and Cr (SW18). On this layer crystallize the second layer of intermetallic phases. It is the phase containing the main alloy addiction of steels: AlFeCr (1H18N9T) and AlFeW (SW18). The last, outside layer consist of silumin containing AlFeNi intermetallic phases on the 1H18N9T steel and AlFeW on the SW18 steel. Regardless of the grade of testing steels there is Si element in all layers of the coat. There are morphological differences in tested layers. The second layer (AlFeW phase) inside the coat on the SW18 steel consist of faced crystals growing into in outside silumin layer. On the 1H18N9T steel a boundary between transient and outside layer is more uniform. Free separations of intermetallic phases inside silumin layer on the 1H18N9T steel have lamellar and on the SW18 steel - faced form.

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Model of the alphinising coating crystallisation on iron alloys

Pietrowski S., Szymczak T.

Archives of Foundry Engineering

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2007

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Vol. 7, iss. 3

123-128

EN

The study presents a hypothetical model of crystallisation of the alphinising coating produced on iron alloys by immersion in the bath of silumin. Basing on a wide-range of experiments and investigations, the effect of the type of inserted material ("armco" iron, C45 steel, grey cast iron and nodular graphite cast iron) and of the technological regime of the alphinising process (chemical composition of silumin bath, its temperature, the time of holding an insert in the bath, and the insert surface roughness height "Rz") on the coating structure was determined. The type of the coating structure was established by metallographic examinations carried out by optical microscopy, electron transmission microsopy and scanning electron microscopy, using additionally an X-ray microanalyser and X-ray diffraction patterns. The results of these investigations were described in [1-7]. Basing on the obtained results, a probable model of the crystallisation of an alphinising coating on iron alloys, produced by immersion in the alphinising bath, was developed. It has been stated that, most probably, the alphinising process begins when the insert reaches its contact temperature "ts".. Since that moment, due to the wetting process and convection movement of bath around the insert surface, an intense process of the dissolution starts. A reactive diffusion of the atoms of Fe and Si from the insert to the bath and of the atoms of Al and Si from the bath to the insert takes place. An intermetallic Al3Fe phase is crystallising on the steel, while on the cast iron, a silicon carbide Fe4CSi is growing, probably due to carbon diffusion from graphite. Then, on the steel, as an effect of the peritectic reaction, are successively crystallising the phases of Al12Fe3Si2 and Al9Fe3Si2. The Al3Fe phase probably crystallises on the cast iron to be transformed later, due to peritectic reaction, into an Al12Fe3Si2 phase on which the Al9Fe3Si2 phase will be growing. When the insert is taken out from the bath, on the Al9Fe3Si2 phase are crystallising the phase constituents present in the silu-min bath. It has been proved that the process of crystallisation of the alphinising coating and its thickness are also affected by the roughness height "Rz". There is a critical value of "Rz", different for the steel and cast iron, up to which the thickness of the coating is growing, and which - when exceeded - makes the coating thickness decrease.

3

Odlewy warstwowe staliwo - żeliwo

Kilarski J., Suchoń J.

Archiwum Odlewnictwa

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2006

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R. 6, nr 22

266-271

PL

W artykule przedstawiono technologię wytwarzania odlewu warstwowego staliwo-żeliwo metodą odlewniczą na przykładzie młotków do kruszarek. Metoda ta wykorzystująca połączenie mechaniczne (skurczowe) stwarza szerokie możliwości zastosowania tego typu odlewów na wiele elementów maszyn wykorzystując własności obu materiałów.

EN

In the paper presents of production of compound casting of cast steel and chromium cast iron in example hammers in hammer crushers. This method is enabled connection two materials about different properties and widened extended application of chromium cast iron when is necessary machining or welding of castings.

4

Odlewy warstwowe

Bartocha D., Suchoń J., Jura S.

Krzepnięcie Metali i Stopów

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1998

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nr 38

151--156

PL

W artykule opisano badania nad opracowaniem technologii wytwarzania metodą odlewniczą płyt bimetalowych staliwo chromowe – blacha stalowa. Technologia taka pozwoliłaby rozszerzyć zastosowanie staliwa chromowego na elementy maszyn poddawane podczas montażu obróbce mechanicznej bądź spawaniu.

EN

In the paper presents procedure of production of compound casting of steel plate and chromium steel cast. This method is enabled connection two materials about different properties and widened extended application of chromium steel cast when is necessary machining or welding of castings.