铝锻件在飞饥和导弹结构中得到了广泛的应用。在这些锻件的使用中发现了一些问题。最主要的问题是,在闭合模锻件的分模面上有横向晶粒流(图1)。横向晶粒方向最易出现应力腐蚀破裂,因为在低于4.22公斤/毫米~2的应力下就受到破坏了。图2示出了在三个主要晶粒方向上有关的应力腐蚀破裂敏感性。分模面上的晶粒流问题,在所有 Aluminum forgings have been widely used in flying hunches and missile structures. Some problems have been found in the use of these forgings. The main problem is that there is lateral grain flow on the parting surface of the closed die forgings (Figure 1). Stress-corrosion cracking is most likely to occur in the transverse grain direction, as it is destroyed at stresses below 4.22 kg / mm -2. Figure 2 shows the stress corrosion cracking sensitivity associated with the three main grain orientations. Particle flow on the die surface problem at all