The Effect of Austempering Temperature on the Matrix Morphology and Thermal Shock Resistance of Compacted Graphite Cast Iron
Aneta Jakubus, Marek Sławomir Soiński, Grzegorz Stradomski, Maciej Nadolski, Marek Mróz
TL;DR
This study examines how different austempering temperatures affect the structure and thermal shock resistance of compacted graphite cast iron.
Contribution
The novel contribution is identifying that austempering at 290 °C yields the best thermal shock resistance in compacted graphite cast iron.
Findings
Austempering at 390 °C produced more retained austenite than at 290 °C.
Austempering at 290 °C resulted in the highest thermal shock resistance.
Thermal shocks caused ausferrite to transform into ferrite with carbides.
Abstract
The significance of the matrix morphology of vermicular cast iron for the alloy’s thermal shock resistance was determined. The study included vermicular cast iron subjected to heat treatment in order to obtain an ausferritic matrix. Heat treatment involved austenitization at 960 °C for 90 min, followed by two different austempering variants at 290 °C and 390 °C, each for 90 min. Austempering at 390 °C resulted in a higher content of retained austenite compared to austempering at 290 °C. A test stand was used to determine thermal shock resistance, enabling repeated heating and cooling of the samples. The samples were heated inductively and subsequently cooled in water at a constant temperature of approximately 30 °C. The total length of cracks formed on the wedge-shaped surfaces of the tested samples was adopted as a characteristic value inversely proportional to the material’s thermal…
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Taxonomy
TopicsMetal Alloys Wear and Properties · Microstructure and Mechanical Properties of Steels · Surface Treatment and Residual Stress