| 1 | THERMODYNAMICS OF CERIUM CARBIDE Fe_4Ce_4C_7 IN STEEL显示文摘The thermodynamics and the properties of the cerium carbide Fe4 Ce4 C7 in steel have been studied by means of metallography, electron microprobe, X-ray diffraction technique and electrolytic separation. The main results obtained can be summarized as follows: The cerium carbide CeC2 can be precipitated in cast steel and distributed along the grain boundaries. Heat treating the steel as austenite, the CeC2 transformed into ternary compound Fe4Ce4 C7, its thermodynamics of formation in steel being expressed as: ac exp(6400/T-6. 28), where 1015K | J.Z.Zhang D.Z.Li | 1998 | Acta Metallurgica Sinica(English Letters)1998，11，2： | 2 |
| 2 | MICROSTRVCTURE SIMULATION AND PROCESS OPTIMIZATION OF TURBINE BLADE CASTINGS显示文摘The probabilistic modeling is applied to calculate microstructural features of the thin complex smprolloy turbine blades cast by the vacuum investment process. The random distribution, orientation and physical mechanism of the nucleation, the growth kinetics of dendrites and the columnar-to-equiaxed transition (CET) are considered.Capitalizing on these simulating schemes, the comprehensive influence of key process variables on the scale and uniformity of grains has been involved quantitatively. The validity of the modeling is confirmed by selection of the optimum process variables. | D.Z.Li Z.Y.Hu Q.Li Y.Y.Li | 1998 | Acta Metallurgica Sinica(English Letters)1998，11，5： | 2 |
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