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Effect of the Annealing Temperature on the Microstructure and Properties of Ausferritic Nodular Cast Iron

Gumienny G., Klimek L., Kurowska B.

Archives of Foundry Engineering

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2016

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Vol. 16, iss. 3

43--48

EN

The paper presents the microstructure and selected properties of ausferritic nodular cast iron annealed at the temperature 520 and 550°C. This choice was dictated by the temperatures used in the practice of nitriding. Nodular graphite in cast iron was obtained with use of Inmold process. Cast iron containing molybdenum and copper ensuring obtaining an ausferrite in the cast iron matrix without the use of heat treatment of castings was tested. The effect of annealing temperature on the microstructure and the kind of fracture of the ausferritic nodular cast iron was presented. The effect of an annealing temperature on hardness, impact strength and the microhardness of ausferritic nodular cast iron matrix was shown too. The lamellar structure of phases in the cast iron matrix after annealing has been ascertained. There has been an increase in hardness of an annealed cast iron and microhardness of its matrix. The reduction in the impact strength of the cast iron annealed at 520 and 550°C was approximately 10-30%. Both an increase in the hardness of cast iron as well as an decrease in its impact strength is probably due to the separation of secondary carbides during the heat treatment.

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The effect of thermal treatment on the mechanical properties of vermicular cast iron

Mierzwa P., Soiński M. S.

Archives of Foundry Engineering

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2010

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Vol. 10, iss. 1 spec.

99--102

EN

The work determines the effect of austempering (isothermal quenching) on the basic mechanical properties of cast iron with vermicular graphite. The cast iron has been produced in one of Polish foundries. Copper addition in the amount of about 1% has been introduced to the cast iron in order to obtain the pearlitic matrix. The mechanical properties (Rm, R0,2 , A5, HB) have been determined both for the as-cast state and after austenitizing at 960 °C combined with quenching at 290 °C for 90 minutes, and also after austenitizing at 960 °C followed by isothermal quenching at 290 °C for 150 minutes. It has been found that the thermal treatment, resulting in the cast iron matrix change from the ferritic-pearlitic one to the one composed of acicular precipitates of ferrite and residual austenite, causes a distinct increase in cast iron strength; after the thermal treatment it has reached about 900÷1000 MPa. The examination has been performed using the specimens cut out of the reversed U-block test coupons of walls 25 mm thick and 50 mm high.

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Wybrane zagadnienia kształtowania struktury i właściwości żeliwa ausferrytycznego

Guzik E.

Archiwum Odlewnictwa

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2006

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R. 6, nr 21/1

33-42

PL

W pracy przedstawiono terminologie związane z żeliwem poddanym hartowaniu z przemianą izotermiczną (ADI, DADI, AADI, CADI, AVCI, AGI) jego strukturą oraz własciwości mechaniczne. Omówiono możliwość sterowania strukturą tego żeliwa oraz wynikającymi z niej właściwościami mechanicznymi, a także wskazano na różnicę w budowie ausferrytu i bainitu w żeliwie ADI. Pokazano zastosowanie żeliwa ADI na odlewy koła przeznaczonego do pracy suwnicy mechanicznej.

EN

The various the terminology of the Austempered Ductile Iron (ADI) process and microstructure as well as mechanical properties of ADI, AADI, AVCI, CADI (with carbides) are presented in the work. The steering possibilities of microstructure of ADI, AADI, CADI, AVCI and consequential of it mechanical properties such as the different types ausferrite and bainite in cast iron have been described. The application of Austempered Ductile Iron were presented.

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Nowoczesne odmiany żeliwa o strukturze ausferrytycznej

Kowalski A., Pytel A.

Archiwum Odlewnictwa

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2006

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R. 6, nr 18/2

83--88

PL

Opisano nowe odmiany żeliwa ausferrytycznego: szarego, wermikularnego, z węglikami, z ferrytem, niskowęglowego, z martenzytem, obrabialnego mechanicznie. Podano charakterystykę, zalety, własności mechaniczne i możliwości zastosowania w/w żeliwa. Przedstawiono wyniki badań własnych wybranych odmian tego żeliwa: technologię, własności mechaniczne i strukturę po hartowaniu izotermicznym.

EN

New variations of cast iron were described, namely cast irons ausferritic, grey, vermicular, with carbides, with proeutectoid ferrite, low-carbon, with martensite, and machinable. A characteristic of these grades of cast iron was given along with their advantages, mechanical properties and application fields. The results of own investigations conducted on some selected grades in the scope of technology, mechanical properties and structural examinations of base and austempered material were presented.

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Żeliwo ausferrytyczne jako nowoczesne tworzywo konstrukcyjne

Guzik S.E.

Inżynieria Materiałowa

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2003

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R. XXIV, nr 6

677-680

PL

W pracy przedstawiono terminologie związane z żeliwem poddanym hartowaniu z przemianą izotermiczną (ADI), jego mikrostrukturę oraz właściwości mechaniczne. Omówiono możliwość sterowania strukturą tego żeliwa oraz wynikającymi z niej właściwościami mechanicznymi oraz wskazano na różnice w budowie ausferrytu i bainitu w żeliwie ADI. Pokazano zastosowanie żeliwa ADI na odlewy koła przeznaczonego do pracy suwnicy mechanicznej.

EN

The various the terminology of the austempered ductile iron (ADI) process and microstructure as well as mechanical properties are presented in the work. The steering possibilities of microstructure of ADI and consequential of its mechanical properties such as the different types ausferrite and bainite in cast iron have been described. The application of austempered ductile iron has been shown.