一种高W高温合金中μ相析出及其对拉伸性能的影响

μ Phase Precipitation in a High W Strengthening Superalloy and Its Effect on Tensile Properties

摘要:

研究了一种新型高W变形高温合金中μ相的析出行为及其对合金室温、750和950 ℃拉伸性能的影响。结果表明，μ相在850~1150 ℃温度范围内的析出随温度升高先增加后降低，析出峰温度位于1000 ℃附近。μ相对合金拉伸性能的影响与温度有关，在750 ℃以下，μ相主要起第二相强化作用，提高合金抗拉强度，降低拉伸塑性；在950 ℃下，μ相的析出消耗较多固溶强化元素W，降低抗拉强度，提高拉伸塑性。

Abstract:

The precipitation of μ phase in a high W strengthening nickel-base superalloy and its effect on the tensile properties of the alloy were investigated at room temperature, 750 °C and 950 °C. The results indicate that the precipitation of μ phase firstly increases and then decreases with the increasing of temperature in the range from 850 °C to 1150 °C, with its peak around 1000 °C. The effect of μ phase on tensile properties of the alloy is related with temperature. It strengthens the alloy by impeding the motion of dislocations and increases the yield and ultimate strength at room temperature up to 750 °C, and slightly decreases the elongation. While μ phase deceases the yield and ultimate strength and increases the elongation of the alloy at 950 °C, because its precipitation consumes the solid (solution) strengthening element W which is the main strengthening form when the g￠ phase is largely dissolved.