论文部分内容阅读
Ⅰ 绪 论 涡轮叶片是喷气式发动机上受负荷最大的零件。在发动机工作中,涡轮叶片要受到动荷与离心力的作用,振动以及不同温度的加热,比如,叶身尾部加热到900℃,则叶片中部的温度约为700℃,而锁扣部分约为300℃。同时,叶片各部位所受的应力,无论从其性质和大小上来说,都是各不相同的。因此,在研究涡轮叶片的新合金时,应该考虑这一些情况。因为有时影响叶片工作的,可能不是像高温耐热强度或高温蠕变那样一些重要的性能,而是在比较低的温度下的一些低的性能,例如,在20～700℃温度下的低的疲旁极限,特别是
Ⅰ Introduction Turbine blades are the most loaded parts on jet engines. In the engine work, the turbine blades are subject to the effects of dynamic load and centrifugal force, vibration and heating at different temperatures. For example, when the tail of the blade body is heated to 900 ° C., the temperature in the middle of the blade is about 700 ° C., and the locking part is about 300 ℃. At the same time, the stress suffered by various parts of the leaves, both in terms of their nature and size, are different. Therefore, in studying the new alloy turbine blades, we should consider these situations. Because sometimes affecting blade work may not be as important as high temperature heat resistance or high temperature creep but rather low performance at relatively low temperatures, for example, low temperatures of 20-700C Fatigue limit, especially