Work

A new understanding of micromechanism analysis of rotating anode targets failure during the operation of X-ray tubes

Year: 2025

Type: article

Abstract: The thermal shock resistance of rotating anode targets in CT equipment is critically influenced by material production processes, mechanical properties, surface state, and microstructure. While current research focuses on preparation techniques and damage morphology, systematic studies on comprehensive properties and microstructure correlations remain insufficient. This study systematically investigates the physical-mechanical properties and microstructure of W-Re/TZM composite materials, revealing that the W-Re layer exhibits lower densification than the TZM layer, with both density and hardness decreasing radially. Room-temperature tensile testing demonstrates that the TZM alloy possesses good plasticity, while the W-Re material and composite exhibit significant brittleness. High-temperature forging induces the formation of subgrains and shear bands within the W-Re layer, with grains retaining their deformed structure. Following heat treatment, the TZM layer achieves a fully recrystallized state characterized by relatively large grain size. Subsequent operational testing leads to partial recrystallization within the surface W-Re grains. Shaft jamming incidents cause surface melting of the W-Re layer, resulting in thermal groove formation and pitting corrosion. Within the resultant ablation zone, a portion of grains transforms into columnar crystals, while others undergo recrystallization. The surface recrystallization behavior demands particular attention throughout the target material's service life.

Source: Materials & Design

DOI: 10.1016/j.matdes.2025.115285