Theequilibrium distribution ratio of manganese between BaO-BaF=-MnO slag and Mn
The effects of various additives (CaO, MgO, Si0=, CaF, and Al~0,) According to Reactions (2) and (3) Table l). This slag systern can also meet the requirements of dephosphorizing ferro manganese. 3.2.BaO-CaO-BaF2-MnO SystemThe distribution ratios of phosphorus and manganese between BaOCaO-BaF2-MnO slags and MnFe-C-P melts at 1 300'C and po,=9'62 x 10 18 atm are plotted against the CaOcontent in Fig. 3 Vol. 38 (1998)
Modern two-phase high-alloyed alloys based on titanium are characterized by a high specific strength. The thermal cycle of welding results in change of structures of weld and HAZ metal and also in deterioration of mechanical characteristics of the joint. In the work the properties of welded joints of titanium alloys VT23, T110 and high-alloyed alloy Ti-6.5Al-3Mo-2.5V-4Nb-1Cr-1Fe-2.5Zr, produced using electron beam and argon arc welding, were evaluated. In weld and HAZ metal of the TIG-welded joints of alloy Ti-6.5Al-3Mo-2.5V-4Nb-1Cr-1Fe-2.5Zr, the structure is formed with a predominance of metastable β-phase and low values of strength and impact toughness, the joints require postweld high-temperature annealing at temperature of not less than 900 °C. The joints of VT23 alloy have high values of strength and impact toughness. High-strength titanium alloy T110 is characterized by good weldability in EBW and TIG welding, has high values of impact toughness of weld metal and HAZ after annealing, the strength of welded joints is at the level of 0.9 of base metal strength. 7 Ref., 2 Tables, 4 Figures. K e y w o r d s : titanium alloys, tungsten-electrode argon-arc welding, electron beam welding, propertiesModern two-phase high-alloyed alloys based on titanium are characterized by a high specific strength, nowadays the growing attention is paid to widening the use of welded structures and assemblies of high-strength titanium alloys (σ t > > 1100 MPa) [1,2]. The weldability of twophase high-alloyed titanium alloys, the use of which may provide the greatest reduction in mass of the structure, is significantly worse than that of low-alloyed alloys, and according to this indicator they are inferior even to some highstrength steels, therefore, when developing new titanium alloys, a significant attention is paid to the possibility of producing welded joints with strength of not less than 0.90-0.95 of base material strength.The aim of the work is to evaluate the properties of welded joints of both industrial and also new two-phase high-titanium alloys having σ t > > 1000 MPa (Table 1), developed at the E.O.Paton Electric Welding Institute, as well as to study the influence of thermal cycle of welding and postweld heat treatment on structural and phase transformations in weld metal and HAZ.In the course of investigations the properties of welded joints, produced by electron beam welding (EBW) and argon arc welding with tungsten electrode (TIG) without using filler metal were compared.The joints of high-strength titanium alloy VT23 [3] were made of 10 mm thick plates, joints of titanium alloy of grade T110 were made of 7 mm thick plates. The high-grade alloy of T110 system Ti-5.5Al-1.2Mo-1.2V-4Nb-2Fe-0.5Zr was developed at the PWI together with the O.K. Antonov ASTC [4]. It contains the following alloying elements, wt.%: 5-6 Al, 3.5-4.8 Nb, 0.8-1.8 Mo, 0.8-2 V, 1.5-2.5 Fe, 0.3-0.8 Zr. Alloy T110, as compared to VT23, has a higher resistance to the formation of fatigue cracks and according to the number of service characteristics...
The equilibrium distribution ratio of phosphorus between BaO-BaF 2-MnO slags and Mn(62-73%)-Fe-C sat-P melts has been determined for different slag compositions, oxygen partial pressures and at 1573-1673 K. The results showed that with a certain content of BaO in the slags, the phosphorus distribution ratio increased with increasing oxygen partial pressure up to about 10-17 atm. A high oxygen partial pressure resulted in a substantial oxidation of manganese from metal to slag. The phosphate capacity of BaO-BaF 2-MnO slags increased with the BaO content and decreased with the MnO content in the investigated slag composition range. A high temperature resulted in a low phosphorus distribution ratio. For a BaO(50%)-BaF 2(47%)-MnO(3%) slag, the effect of temperature on the phosphate capacity in the range of 1573-1673 K could be expressed as:The heat of reaction:was estimated to be -1107 kJ/mole. Phosphorgleichgewicht zwischen BaQ-BaF2-MnQ-FluBmltteln und Ferromanganschmelzen. Das Gleichgewichtsverteilungsverhaltnis von Phosphor zwischen BaO-BaF 2-MnO-Schlacken und Mn(62-73%)-Fe-C ges-P-Schmelzen wurde fOr verschiedene Schlackenzusammensetzungen und SauerstoffpartialdrOcke im Temperaturbereich 1573-1673 K bestimmt. Die Ergebnisse zeigen, daB das Phospho rverteliunqsverhaitnls bei einem bestimmten BaO-Gehalt in der Schlacke mit dem Sauerstoffpartialdruck (bis ca. 10-17 atrn) ansteigt. Ein hoher Sauerstoffpartialdruck schlagt slch in einer substantiellen Mn-Oxidation vorn Metall zur Schlacke nieder. Die Phosphatkapazitat der BaO-BaF 2-MnO-Schlacken wachst mit dem BaO-Gehalt, tallt jedoch mit dem MnO-Gehalt im Zusammensetzungsbereich der untersuchten Schlacken. Hohe Temperaturen fOhren zu einem geringen Phosphorverteilunqsverhaltnis. FOr eine BaO(50%)-BaF 2(47%)-MnO(3%)-Schlacke kann der TemperatureinfluB auf die Phosphatkapazitat im Bereich 1573-1673 K durch die Gleichung: 5.85.10 4 10gCpo~-= T -9.25ausgedrOckt werden. Die Heaktionswarrne der Umsetzung 1/2P 2 (g) + 5/40 2 (g) + 3/2(BaO) = Ba1.SP04 betraqt -1107 kJ/mol.
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