45#硬线拉拔断裂分析  

DRAWING BREAK ANALYSIS OF 45# HARD WIRE

作　　者：张海旺[1] 张敏[1] 汪鹏[1] 李朝辉[1] 

机构地区：[1]河北钢铁集团邯钢公司技术中心,河北邯郸056015

出　　处：《河北冶金》2015年第2期45-48,共4页Hebei Metallurgy

摘　　要：针对45#硬线由Φ6.5 mm拉拔到Φ4.6 mm时发生断裂的问题,分析了其拉拔断口及表面裂纹形貌,用金相显微镜、扫描电镜对其金相组织、夹杂物及化学成分进行分析,结果表明:45#硬线钢中存在大颗粒脆性夹杂物,降低了盘条表面的强度和塑性,使其在拉拔过程中出现横裂纹,继而引起拉拔断裂,盘条表层组织不均匀也增加了盘条断裂机率。提出了夹杂物控制和金相组织改进措施,改进后盘条拉拔到Φ3.8 mm时的断丝率不足1.5%。To solve the problem of 45# hard wire： breaking when drewfrom Φ 6. 5 to 4. 6 mm,its fracture surface and the surface cracks morphology are analyzed as well as its metallographic structure,inclusion and chemical composition with metallographic microscope and SEM. It is showed from the result that there is large- size brittle inclusion in it and so the surface strength and plasticity of the wire bar reduced,and transverse crack takes place on it in drawing and then broken. Besides,not homogeneous surface structure of wire bar increases the rate of break. The measures in controlling inclusion and improving metallographic structure are proposed. After improvement the break rate of wire bar is below1. 5% when drewto Φ 3. 8 mm.

关 键 词：45#硬线拉拔 断裂 分析 

分 类 号：TG142.33[一般工业技术—材料科学与工程]