Effect of austenitizing temperature on the microstructure evolution and properties of Cu-bearing CADI

Abstract

In the present study, the authors investigated the effect of the austenitizing temperature (860 to 1020 °C) on the microstructure evolution, hardness, wear resistance and corrosion resistance of Cu-bearing carbidic austempered ductile iron (CADI) by means of an optical microscope (OM), a scanning electron microscope (SEM), a Rockwell hardness tester, a microhardness tester, an X-ray diffractometer (XRD), a block-on-ring wear testing machine and electrochemical tester. The results show that with an increase in the austenitizing temperature, the amount of acicular ferrite decreases, size expands, and the volume fraction of high-carbon austenite increases gradually as does carbon content. Part of the carbide dissolves into the matrix, and the amount is significantly reduced. The hardness of Cu-bearing CADI first increases and subsequently decreases, and the hardness is highest at 940 °C. With an increase in austenitizing temperature, the wear loss of Cu-bearing decreases and its wear resistance increases. When the austenitizing temperature is 940 °C, wear loss is lowest and wear resistance is optimal. Electrochemical corrosion experiments show that as the austenitizing temperature increases, the corrosion potential of Cu-bearing CADI is slightly improved, the corrosion current density is gradually reduced, and the corrosion resistance of Cu-bearing CADI is improved. Considered comprehensively, the austenitizing temperature of Cu-bearing CADI should be determined to be 940 °C.

Influence of Austempering Temperatures on the Microstructure and Mechanical Properties of Austempered Ductile Cast Iron

“…As the austempering temperatures increased, the content of the retained austenite increased, but the amount of acicular ferrite gradually decreased. Both the retained austenite and the ferrite coarsening resulted in a decrease of the hardness [10,32], while the volume fraction of high-carbon austenite increased gradually as did the carbon content [33] because a part of the carbide dissolved into the matrix. Experiments of cantilever-type rotating bending (Figure 2) were performed on the samples treated at different austempering temperatures, to find out the fatigue life of ADI.…”

Simulation on stress of large diameter CADI grinding ball based on ANSYS

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C ADI (Carbidic Austempered Ductile Iron) is a new kind of wear-resistant material developed on the basis of ADI [1] (Austempered Ductile Iron). There are many studies concerning CADI, such as on chemical composition [2][3][4][5] , microstructure [6,7] , properties [8][9][10][11] and heat treatment [12][13][14][15] . The matrix structure of ADI is composed of the acicular ferrite with high hardness, and the strong and ductile retained austenite.

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