Wyniki wyszukiwania - BazTech

1

The Abrasive Wear Resistance of Chromium Cast Iron

Kopyciński D., Piasny S., Kawalec M., Madizhanova A.

Archives of Foundry Engineering

|

2014

|

Vol. 14, iss. 1

63--66

EN

The resistance of cast iron to abrasive wear depends on the metal abrasive hardness ratio. For example, hardness of the structural constituents of the cast iron metal matrix is lower than the hardness of ordinary silica sand. Also cementite, the basic component of unalloyed white cast iron, has hardness lower than the hardness of silica. Some resistance to the abrasive effect of the aforementioned silica sand can provide the chromium white cast iron containing in its structure a large amount of (Cr, Fe)7C3 carbides characterised by hardness higher than the hardness of the silica sand in question. In the present study, it has been anticipated that the white cast iron structure will be changed by changing the type of metal matrix and the type of carbides present in this matrix, which will greatly expand the application area of castings under the harsh operating conditions of abrasive wear. Moreover, the study compares the results of abrasive wear resistance tests performed on the examined types of cast iron. Tests of abrasive wear resistance were carried out on a Miller machine. Samples of standard dimensions were exposed to abrasion in a double to-and-fro movement, sliding against the bottom of a trough filled with an aqueous abrasive mixture containing SiC + distilled water. The obtained results of changes in the sample weight were approximated with a power curve and shown further in the study.

2

Analysis of the structure and abrasive wear resistance of white cast iron with precipitates of carbides

Kopyciński D., Kawalec M., Szczęsny A., Gilewski R., Piasny S.

Archives of Metallurgy and Materials

|

2013

|

Vol. 58, iss. 3

973--976

EN

The resistance of castings to abrasive wear depends on the cast iron abrasive hardness ratio. It has been anticipated that the white cast iron structure will be changed by changing the type of metal matrix and the type of carbides present in this matrix, which will greatly expand the application area of castings under the harsh operating conditions of abrasive wear. Detailed metallographic analysis was carried out to see the structure obtained in selected types of white cast iron, i.e. with additions of chromium and vanadium. The study compares the results of abrasive wear resistance tests performed on the examined types of cast iron.

PL

Odporność żeliwa na zużycie ścierne zależy od stosunku twardości metalu i ścierniwa. W pracy założono kształtowanie struktury żeliwa białego w wyniku zmiany rodzaju osnowy metalowej oraz węglików, co znacznie rozszerza obszar zastosowania odlewu w trudnych warunkach zużycia ściernego. Przeprowadzono szczegółowa analizę metalograficzną struktury wybranych gatunków żeliwa białego t.j.: chromowego oraz wanadowego. W niektórych przypadkach zaproponowano koncepcje sterowania ilością i rodzajem węglików w osnowie metalowej żeliwa lub wprowadzania dodatkowych węglików do struktury eutektycznej tego rodzaju żeliwa. Ponadto w pracy porównano wyniki badań odporności na zużycie ścierne analizowanych gatunków żeliwa.

3

Influence of tungsten and titanium on the structure of chromium cast iron

Kopyciński D., Piasny S.

Archives of Foundry Engineering

|

2012

|

Vol. 12, iss. 1

57-60

EN

The paper analyses the as-cast state structure of chromium cast iron designed for operation under harsh impact-abrasive conditions. In the process of chromium iron castings manufacture, very strong influence on the structure of this material have the parameters of the technological process. Among others, adding to the Fe-Cr-C alloy the alloying elements like tungsten and titanium leads to the formation of additional carbides in the structure of this cast iron, which may favourably affect the casting properties, including the resistance to abrasive wear.

4

The structure of abrasion-resisting castings made of chromium cast iron

Kopyciński D., Guzik E., Piasny S.

Archives of Foundry Engineering

|

2011

|

Vol. 11, iss. 1

61-64

EN

In this study presents the analyse of chrome iron cast structure (as-cast condition) which are used in rugged conditions abrasion-percussive and high temperature. While producing the casts of chrome iron major influence has been preserve the structure of technological process parameters. The addition to Fe-C-Cr alloy Ni, Mo or Cu and then proper heat treatment leads to the improvement of functional and mechanical cast qualities. Then it is possible to develop high mechanical properties which are recommended by PN-EN12513. As can it be seen from the above research silicon is an adverse chemical element in this kind of alloy cast iron. However, the reason of cracks appearing in chrome iron casts are phosphorus eutectic microareas. When the compound of Si and P reach the critical point, described in PN-88/H-83144 outdated standard, the microareas might appear.