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Effect of Heat-treatment Parameters of Cast Iron GJS-X350NiMnCu7-3-2 on its Structure and Mechanical Properties

Medyński D., Janus A., Zaborski S.

Archives of Foundry Engineering

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2017

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Vol. 17, iss. 1

121--126

EN

The paper presents influence of soaking parameters (temperature and time) on structure and mechanical properties of spheroidal graphite nickel-manganese-copper cast iron, containing: 7.2% Ni, 2.6% Mn and 2.4% Cu. Raw castings showed austenitic structure and relatively low hardness (150 HBW) guaranteeing their good machinability. Heat treatment consisted in soaking the castings within 400 to 600°C for 2 to 10 hours followed by air-cooling. In most cases, soaking caused changes in structure and, in consequence, an increase of hardness in comparison to raw castings. The highest hardness and tensile strength was obtained after soaking at 550°C for 6 hours. At the same time, decrease of the parameters related to plasticity of cast iron (elongation and impact strength) was observed. This resulted from the fact that, in these conditions, the largest fraction of fine-acicular ferrite with relatively high hardness (490 HV0.1) was created in the matrix. At lower temperatures and after shorter soaking times, hardness and tensile strength were lower because of smaller degree of austenite transformation. At higher temperatures and after longer soaking times, fine-dispersive ferrite was produced. That resulted in slightly lower material hardness.

2

Effect of Nickel Equivalent on Structure and Corrosion Resistance of Nodular Cast Iron Ni-Mn-Cu

Medyński D., Janus A.

Archives of Foundry Engineering

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2015

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Vol. 15, iss. 1 spec.

69--74

EN

Within the research determined was the effect of nickel equivalent on structure, hardness and corrosion resistance of nodular cast iron Ni- Mn-Cu. The examinations revealed a drop of thermodynamic stability of austenite along with decreasing nickel content. Along with in-creasing degree of austenite transformation, the created martensite resulted in significant increase of hardness (and of abrasion resistance as well) of the examined of cast iron, accompanied by insignificant decrease of corrosion resistance.

3

Effect of chemical composition on number of eutectic colonies in Ni-Mn-Cu cast iron

Janus A.

Archives of Foundry Engineering

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2013

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Vol. 13, iss. 1

51--56

EN

Determined were direction and intensity of influence of alloying additions on the number of eutectic graphite colonies in austenitic cast iron Ni-Mn-Cu. Chemical composition of the cast iron was 1.7 to 3.3% C, 1.4 to 3.1% Si, 2.8 to 9.9% Ni, 0.4 to 7.7% Mn, 0 to 4.6% Cu, 0.14 to 0.16% P and 0.03 to 0.04% S. Analysed were structures of mottled (20 castings) and grey (20 castings) cast iron. Obtained were regression equations determining influence intensity of individual components on the number of graphite colonies per 1 cm2 (LK). It was found that, in spite of high total content of alloying elements in the examined cast iron, the element that mainly decides the LK value is carbon, like in a plain cast iron.

4

Skłonność do zabieleń żeliwa Ni-Mn-Cu przeznaczonego na odlewy kokilowe

Janus A., Kurzawa A.

Archiwum Odlewnictwa

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2004

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R. 4, nr 11/1

209--215

PL

Określono wpływ zawartości manganu (od 1,5 do 6,2%) i miedzi (od 0,1% do 6,0%) na skłonność do zabieleń oraz wrażliwość na zmianę grubości ścianki odlewu dla niklowego żeliwa zawierającego średnio 3,1% C, 2,3% Si i 6, i % Ni. Stwierdzono możliwość wytwarzania niezabielonych odlewów kokilowych o średnicy 10 - 40 mm wykonanych z żeliwa zawierającego ok. 3% miedzi i do 43% manganu.

EN

Effect of manganese (1.5-6.2%) and copper (0.1-6.0%) content on hard spots susceptibility and sectional susceptibility of medium - nickel cast iron containing 3.1% C, 2.3% Si and 6.1 % Ni was determined. It was ascertained the possibility of manufacturing of not spot hardened chill casts of dimeters 10-40 mm made of cast iron containing of 3% of copper and up to 4.5%