Method for eliminating coarse grains at rod part of solid solution state Waspaloy alloy bolt

The invention belongs to the technical field of aerospace fastener processing, and particularly relates to a method for eliminating coarse grains on a rod part of a solid-solution Waspaloy alloy bolt, which is characterized in that before hot upsetting forming processing, the rod part of an upset blank is subjected to hole shrinkage forming processing, and the deformation is 8-12%. According to the method, the hole shrinkage forming machining procedure for the rod part of the upset blank bolt is added before upsetting, so that the rod part of the bolt reaches the critical deformation amount of the material before hot upsetting, and mixed crystal and coarse crystal structures are prevented from appearing in the heat treatment machining process after hot upsetting forming of the bolt; therefore, the uniformity of the grain structure of the rod part of the bolt made of the solid-solution Waspaloy alloy subjected to thermal forming processing is improved, and the problem of the coarse grain structure of the rod p