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Influence of Heat Treatments and Ni Content on Properties of Martensitic Stainless Steel

Čamek L., Kaňa V., Záděra A., Myška M.

Archives of Foundry Engineering

2018

Vol. 18, iss. 2

220--225

The article deals with the influence of chemical composition of martensitic stainless steel for castings GXCrNi13-4 (the 1.4317 material) on mechanical properties and structure of as cast steel after heat treatment. Properties of these martensitic stainless steel are heavily influenced by chemical composition and structure of the material after heat treatment. Structure of these steels after quenching is formed with martensite and residual austenite. When tempering the steel the carbon content in martensite is reduced and gently deposited carbides occur. The way of heat treatment has a major impact on structure of martensitic steels with low carbon content and thus on strength, hardness and elongation to fracture of these steels. Chemical composition of the melt has been treated to the desired composition of the lower, middle and upper bounds of the nickel content in the steel within the limits allowed by the standard. Test blocks were gradually cast from the melt. The influence of the nickel equivalent value on structure and properties of the 1.4317 steel was determined from results of mechanical tests.

Dilatometric Research of High-quality Nodular Cast Iron

Medyński D., Janus A.

Archives of Foundry Engineering

2018

Vol. 18, iss. 2

163--168

In the research, relationships between matrix structure and hardness of high-quality Ni-Mn-Cu cast iron containing nodular graphite and nickel equivalent value were determined. Nickel equivalent values were dependent on chemical composition and differences between them resulted mostly from nickel concentration in individual alloys. Chemical compositions of the alloys were selected to obtain, in raw condition, austenitic and austenitic-martensitic cast iron. Next, stability of matrix of raw castings was determined by dilatometric tests. The results made it possible to determine influence of nickel equivalent on martensite transformation start and finish temperatures.

Wpływ wartości ekwiwalentu niklowego na strukturę żeliwa Ni-Mn-Cu

Janus A.

Archiwum Odlewnictwa

2006

R. 6, nr 18/2

159--164

Na podstawie analizy struktur opracowano równanie ekwiwalentu niklowego dla odlewów wykonanych z żeliwa Ni-Mn-Cu zawierającego: 2,5-4,5% C; 1,5-3,0% Si; 2,0-8,0% Ni; 2,0-8,0% Mn i 0,1-5,0% Cu. Określono minimalną wartość ekwiwalentu, konieczną do uzyskania trwałej w temperaturze otoczenia austenitycznej struktury osnowy metalowej żeliwa w stanie po odlaniu.

On the base of structures analysis the equation of nickel equivalent for castings made of Ni-Mn-Cr cast iron containing 2.5-4.5% C, 1.5-3.0% Si, 2.0-8.0% Ni, 2.0-8.0% Mn and 0.1-5.0% Cu was elaborated. The minimum value of this equivalent necessary for the obtainment of the stable austenitic structure of the rough castings at the ambient temperature was determined.