Increase In Solution Treatment Temperature Research Articles

Effect of solution treatment temperature on tensile properties of AI-7Si-O.3Mg (wt-%) alloy

The effect of solution treatment temperature on the tensile properties of an AI-7 Si-0.3Mg (wt-%) alloy has been studied using tensile and hardness testing, microprobe composition analysis, and differential scanning calorimetry. With a sufficiently long solution treatment time, an increase in solution treatment temperature from 500 to 560°C significantly increases the silicon content in the matrix, but has little effect on the magnesium content. This results in a slight increase in the peak aged yield strength, but a more significant increase in the peak aged ultimate tensile stress and hardness. The alloy ductility is independent of solution treatment temperature, but is clearly influenced by the degree of eutectic silicon particle spheroidisation and coarsening. Using a higher solution treatment temperature can shorten the solution treatment time required to achieve a given tensile elongation value.

Effect of solution treatment temperature on tensile properties of AI-7Si-O.3Mg (wt-%) alloy

The effect of solution treatment temperature on the tensile properties of an AI-7 Si-0.3Mg (wt-%) alloy has been studied using tensile and hardness testing, microprobe composition analysis, and differential scanning calorimetry. With a sufficiently long solution treatment time, an increase in solution treatment temperature from 500 to 560°C significantly increases the silicon content in the matrix, but has little effect on the magnesium content. This results in a slight increase in the peak aged yield strength, but a more significant increase in the peak aged ultimate tensile stress and hardness. The alloy ductility is independent of solution treatment temperature, but is clearly influenced by the degree of eutectic silicon particle spheroidisation and coarsening. Using a higher solution treatment temperature can shorten the solution treatment time required to achieve a given tensile elongation value.

Ti-6Al-2Sn-4Zr-6Mo合金の衝撃靱性に及ぼすミクロ組織因子の影響

The instrumented Charpy impact test and dynamic fracture toughness test are carried out on variously heat treated Ti-6Al-2Sn-4Zr-6Mo alloy, and the effect of microstructure on toughness under impact loading is examined.In equiaxed α structural specimens, Charpy absorbed energy (Et) value increases with the increase of solution treatment temperature below 1 123 K, and then decreases with increase of solution treatment temperature above 1 123 K. Et value is strongly influenced by the cooling rate after solution treatment. In equiaxed α structural specimens, the tendency of the change in dynamic fracture toughness (Jd) with solution treatment temperature is similar to that of Et value. However, the degree of the change in Jd value and the effect of cooling rate after solution treatment on Jd value are significantly small. Et and Jd values are remarkably large in acicular structural specimens which are furnace cooled after solution treatment in the β region. In acicular α structural specimens, Et and Jd values increase with the increase of prior β grain size. However, in equiaxed α structural specimens, Et value rather decreases with increase of prior β grain size although Jd value increases. Et and Jd values increase with the increase of the roughness of fracture surface.