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由于HR-2抗氢钢棒料内存在氧化物、碳化物杂质及脆性相使得HR-2球壳的成形性能急剧降低,锻件表面产生局部裂纹。经取样分析,在断口表面观察到了较多的碳化物及氧化物颗粒。裂纹萌生周围的断口形貌出现崩碎现象,为典型的脆性断裂形貌。随着裂纹的扩展,断口形貌由崩碎的解理断面扩展到准解理面,最终在裂纹消失处发生了塑性断裂,并出现了大量规则的韧窝。
Due to the presence of oxides, carbide impurities and brittle phases in the HR-2 hydrogen-resistant steel bar, the formability of the HR-2 spherical shell decreases sharply, causing local cracks on the surface of the forged steel. After sampling analysis, more carbides and oxide particles were observed on the fracture surface. Fracture around the initiation of cracks appeared collapse phenomenon, as a typical brittle fracture morphology. With the extension of the crack, the fracture morphology extended from the broken cleavage section to the quasi-cleavage plane, and finally the plastic fracture occurred at the disappearance of the crack and a large number of regular dimples appeared.