The present study addresses the damage evolution mechanism in precipitation-strengthened Fe–Ni–Cr-based steel (SUH 660) at ambient temperature in air. Specifically, damage quantification and associated microstructure characterization were performed. The damage initiation sites were inclusion and grain boundaries impinging dislocation slip. The early stage of damage evolution was observed before necking of the specimen. Subsequent plastic straining caused damage growth along slip planes and coalescence of damage via localized shear in ligaments between damages, for which the behavior was associated with the planar character of the slip. The damage evolution behavior observed in the post-mortem specimen was consistent with fractographic characteristics.

本研究解决了在环境温度下空气中沉淀强化的Fe-Ni-Cr基钢（SUH 660）的破坏演化机理。具体来说，进行损伤定量和相关的微观结构表征。破坏的起始位置是夹杂物和晶界，影响了位错滑移。观察到损伤发展的早期阶段，然后将其颈缩。随后的塑性应变导致沿滑移面的损伤增加，以及在损伤之间的韧带中通过局部剪切产生的损伤合并，其行为与滑移的平面特征有关。验尸标本中观察到的损伤演化行为与分形特征一致。