The folding, die underfilling, rib shifting and average grain size of primary equiaxed α were investigated using five different unequal thickness billets in transitional region of Ti-alloy multi-rib component under isothermal local loading and compared with integral loading. In terms of the macro deformation, the results show that the material transfers from the second-loading zone into the first-loading zone and the die underfilling decreases with the initial volume of the first-loading zone increasing, which reduces the risk of folding and rib shifting. However, that folding and rib shifting did not appear during the integral loading. Nevertheless, when the initial volume of the first-loading zone reaches a certain value, the die underfilling is aggravated both in local and integral loading. With respect to the microstructure, as the initial volume of the first-loading zone increases, the average grain size is decreased after the first-loading step, but increased after the second-loading step with consideration of one single loading step, which lead to the grain size being barely influenced by different billet volume distribution under both loading steps.

在等温局部加载下，采用5种不同厚度的钛合金多肋构件过渡区的坯料研究了初级等轴α的折叠、模具底部填充、肋偏移和平均晶粒尺寸，并与整体加载进行了比较。在宏观变形方面，结果表明，材料从第二加载区转移到第一加载区，模具底部填充随着第一加载区初始体积的增加而减少，从而降低了折叠和折叠的风险。肋骨移位。然而，在整体加载过程中没有出现折叠和肋骨移位。然而，当第一加载区的初始体积达到一定值时，局部加载和整体加载都会加剧芯片底部填充。关于微观结构，