PREDICTION METHOD OF FORMATION CRYSTAL NUCLEI AND CRYSTAL GROWTH OF GRAPHITE DURING CAST IRON SOLIDIFICATION

摘要

PCT No. PCT/SE96/00659 Sec. 371 Date Nov. 28, 1997 Sec. 102(e) Date Nov. 28, 1997 PCT Filed May 21, 1996 PCT Pub. No. WO96/38595 PCT Pub. Date Dec. 5, 1996The surface tension of a sample quantity of molten iron from a batch of molten iron is determined and compared with the surface tension of the sample with the surface tensions of batches of molten iron that are known to solidify as respective different forms of cast iron. The surface tension of the molten iron sample is determined by adding the sample to a sample cup, submerging a device for introducing a noble gas into the molten iron of the sample, positioning a piezoelectric transducer at the bottom of the sample cup, administrating the noble gas at a constant rate through the device, measuring the temperature of the sample, and monitoring vibrations in the molten iron of the sample by recording signals from the transducer.