用金相显微镜和扫描电子显微镜研究了盘条中非金属夹杂物的形态与类型及其对盘条使用过程中断裂行为的影响,并测试了盘条的抗拉强度。盘条在使用过程中发生断裂,断口呈杯锥状和撕裂状。裂纹萌生于非金属夹杂物与基体的界面处;在后续的拉拔或捻股过程中,裂纹沿着夹杂物快速扩展,导致钢丝断裂。 The morphology and type of nonmetallic inclusions in wire rod and their effect on the fracture behavior of wire rod were studied by optical microscope and scanning electron microscope. The tensile strength of the wire rod was tested. Wire rod fracture occurred during use, the fracture was cup conical and tearing. Cracking occurs at the interface between the non-metallic inclusions and the matrix; during subsequent drawing or twisting, the crack propagates rapidly along the inclusions, causing the wire to break.