The effects of alloy elements Cu, Cr and multi alloy additives on the microstructure and properties of gray cast iron were studied from the aspects of strength, microstructure and machinability. By adding different amounts of Ti to gray cast iron, the influence of impurity element ti on the properties of gray cast iron is analyzed, and the methods to improve the machinability of gray cast iron are studied.
Based on the research on the measurement of turning force in the process of material turning in the previous chapter, through the mechanical properties
The effects of Cu, Cr, multi alloy additives and impurity element ti on the properties of gray cast iron were investigated by means of analysis, microstructure observation and cutting performance evaluation. The main results are as follows:
1.The mechanical properties of gray cast iron are significantly improved by alloying. The compound addition of alloy elements Cu and Cr not only promotes the graphitization process of molten iron, but also reduces the white tendency of gray cast iron, and refines the pearlite matrix of gray cast iron. In addition, Cu and Cr alloying can improve the machinability of gray cast iron by improving the uniformity of pearlite structure and microhardness.
2.The tensile strength of gray cast iron obtained by multi-element alloy additives and copper alloying is basically the same, which meets the requirements of HT300. The microstructure of gray cast iron alloyed with multi-element alloy additives is more uniform than that of gray cast iron alloyed with copper. In the cutting experiment, the cutting force and tool wear degree are less than those of gray cast iron alloyed with copper.
3.Grey cast iron samples with different titanium content prepared from different raw materials were analyzed. When the mechanical properties of the two groups of samples are equal, the tool wear and cutting force of the samples cast by low titanium pig iron are less than those cast by z14 melting.