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在现代燃气涡轮发动机中,含铪的涡轮叶片材料得到广泛的应用。其原因之一是铪提高了高温合金的中温持久寿命和塑性,并对合金的组织稳定性有良好的作用。近年来,对含铪合金进一步研究表明,含铪合金不仅显微疏松倾向低,而且热裂倾向也低,适于铸造薄壁气冷涡轮叶片。 以前的工作还证明,铪明显地扩大了合金的凝固范围。按照传统的观念,凝固范
In modern gas turbine engines, hafnium-containing turbine blade materials are widely used. One of the reasons is that hafnium improves the medium-temperature long-life and plasticity of the superalloy and has a good effect on the structural stability of the alloy. In recent years, further research on hafnium-containing alloys shows that the hafnium-containing alloys not only have low tendency of micro-looseness but also low tendency of thermal cracking, and are suitable for casting thin-walled air-cooled turbine blades. Previous work has also shown that hafnium significantly expands the range of solidification of the alloy. According to the traditional concept, solidification Fan