H13钢上顶杆模具的早期断裂分析

Analysis on Premature Fracture of Top Rod of H13 Steel

针对早期断裂的H13钢上顶杆模具,经过理化检验与分析得知,裂纹形成的原因是模具在锻造时加热温度过高,形成晶间熔洞的过烧组织,材料的强度和韧性显著降低。且原材料中非金属夹杂物以及共晶碳化物超标,使得材料性能进一步下降,因而造成模具锻造时开裂。在使用过程中裂纹继续扩展,最终导致模具早期断裂。

Premature fracture of top rod of H13 steel was analyzed by physical test and chemical analysis. The results show that the cause of crack formation was the excessively high heating temperature while forging the mould. The burnt structure of intergranular molten holes was formed, and the strength and toughness property of the mould degraded significantly. In addition, the amount of non-metallic inclusion and the euteetie carbide of the raw material exceeded the standard, which led to the material property further degraded and the mould fractured while forging. The crack continued to extend during use, and finally resulted in the premature fracture failure.