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- 저자 : Marcin Górny (검색결과 1 건)
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Identification of Mg2Cu Particles in Cu-Alloyed Austempered Ductile Iron
Marcin Górny,Edward Tyrała,Gabriela Sikora,Łukasz Rogal 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.1
In the present work, the Mg2Cu precipitates in copper-alloyed austempered ductile iron (ADI) were identified byanalyzing techniques such as TEM and SEM with EDS. It was revealed that, in castings made of ADI-containingcopper, highly dispersed particles of Mg2Cu are formed, whose size does not exceed <1 μm. The research workwas carried out on ductile iron that was austenitized at 900 °C, followed by austempering at 380 °C. The microstructurewas investigated using various techniques, including optical microscopy, XRD, SEM, and TEM. In additionto this, the exhibited impact properties of castings with Cu, Ni, and Cu+Ni were also determined. This studycasts a new light on the formation of the structure of Cu-alloyed ADI. The highly-dispersive and brittle Mg2Cu particlesthat are located in the vicinity of the graphite nodules have a negative effect on the impact properties of ADI. It has also been shown that impact strength decreases from levels of 160-180 J (for copper-free ADI) to 90-120 J(for copper- and copper-nickel-alloyed ADI).
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