Measures to Improve the Microstructure Uniformity of Calipers Substrate
The structure and technical requirements of calipers was introduced.The original production process was using closed gating system,pour-over inoculation process,and inoculation in ladle and stream inoculation when melt shift to ladle.The results shown that there were 8％ cementite in the thin-walled C place at the tail,and the volume fraction of the pearlite in the B and C regions was 35％.The volume fraction of pearlite in the thick area A was 25％～35％.The improvement measures were as follows:(1)Changing the casting system of the casting so that the temperature field of the casting tended to be uniform and the difference in the volume fraction of the pearlite at thick and thin surface was reduced.(2)The instantaneous inoculation was carried out by the simple device,which reduced differences between different regions of the matrix,and the elimination of cementite.
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万方数据
维普
