Table of Contents

    • 100

    • Thermodynamic Evaluation of Inclusion Formation and Nozzle Clogging During Slab Casting

      This study involves the application of metallurgical thermodynamics to understand the mechanisms of inclusion formation during the casting of various steel grades. The formation of different types and compositions of complex inclusions was analyzed, and an attempt was made to apply the results to explain the tendency of nozzle clogging during continuous casting of slabs in a steel plant. Possible remedial measures were proposed to minimize the problem.

    • 107

    • Study of the Optimum Condition for Dephosphorization of Hot Metal

      In order to find the optimum slag composition giving a high-phosphorous equilibrium distribution ratio (LP), the effects of basicity and (%FeO) were investigated with Cu-10%Fe alloy reacted with CaO-SiO2-FeO-MgO-(P2O5) slag at low temperature, in laboratory tests. The results of this study indicate that LP for this system is high, increases with increasing basicity and (%FeO) and again decreases at higher (%FeO). Pilot tests with O2 blowing support these results.

    • 236

    • TWIP+TRIP Plasticity-Enhancement Effect in Ultrahigh-Strength Multi-Phase Steel

      A new class of ductile ultrahigh-strength steel has been developed in which the ductility enhancement is achieved by a combination of the twinning-induced plasticity (TWIP) effect and the transformation-induced plasticity (TRIP) effect. In the present work, the alloy concept of the new ductile ultrahigh-strength steel is presented, and the mechanical properties of the new steel are compared with various advanced high-strength steels. The new type of “TWIP+TRIP” steel combines an ultrahigh strength with a total engineering elongation larger than 60%.