目前,镍基高温铸造合金在航空工业上已广泛应用,但这类合金存在一个共同缺点,就是在中温区间(650℃～815℃)存在一个低强度和低塑性区,即所谓“塑性谷”,而作为涡轮发动机的叶片榫头部分正好工作在这一温度区间,因此这一问题已引起国内外广泛的注意,从设计、工艺和合金化等方面进行了研究改进。我们所使用的K5镍基铸造高温合金虽然其高温瞬时强度和高温持久强度较好,但常 At present, nickel-based high-temperature casting alloys have been widely used in the aviation industry. However, there is a common shortcoming of such alloys in that there is a low-strength and low-plasticity zone in the medium temperature range (650-815 ° C) , And the blade tenon part of the turbine engine just works in this temperature range. Therefore, this problem has drawn wide attention both at home and abroad, and has been improved from the aspects of design, technology and alloying. The K5 nickel-base cast superalloy we use, although it has good high-temperature instantaneous strength and high temperature long-term strength,