高速钢冷挤压凹模开裂失效分析  

Failure analysis on fissuring of high-speed steel cold extrusion die plate

作　　者：卢金斌[1] 张太超[1] 张文勇[1] 张鬲君[1] 张照军[1] 

机构地区：[1]中原工学院材料与化学工程学院,河南郑州450007

出　　处：《模具工业》2007年第1期68-70,共3页Die & Mould Industry

摘　　要：采用扫描电镜、光学显微镜、化学成分分析和硬度测试等方法,对高速钢冷挤压凹模进行了检测和分析。结果表明,原材料质量差,在锻打过程中锻打不充分致碳化物呈带状分布、碳化物粗大且呈棱角状,使材料力学性能差。凹模在使用过程中,由于交变载荷的作用,使碳化物的棱角处应力集中出现裂纹,最终导致凹模开裂。Inspection and analysis was made on the die phte of high-speed steel cold extrusion die by means of SEM （scanning electron microscope）, optical microscope, chemical composition analysis and hardness testing. The result shows that the poor mechanical property of the material is due to insufficient forge which results in stout and angular carbide with zonal distribution. The crack appears at the edge angle due to stress concentration caused by alternating load, which finally leads to the fissuring of die plate.

关 键 词：冷挤压 模具 碳化物 脆性开裂 

分 类 号：TG376.3[金属学及工艺—金属压力加工]