DIN1.2344钢注塑模具的裂纹分析  

Crack analysis for injection mold made from DIN1.2344 steel

作　　者：段莉萍[1] 唐家耘[1] 

机构地区：[1]中国兵器科学研究院宁波分院,浙江宁波315103

出　　处：《兵器材料科学与工程》2014年第6期118-121,共4页Ordnance Material Science and Engineering

基　　金：国家科技支撑计划资助项目(2012BAF12B11)

摘　　要：DIN1.2344钢汽车灯罩注塑模具在最终精加工的型腔工作面发现有微细裂纹。采用着色渗透无损检测、化学成分分析、宏观形貌和微观形貌分析以及能谱分析等方法对裂纹进行研究。结果表明:在模具原材料中存在带状偏析、碳化物网和非金属夹杂物等严重的组织缺陷,模具在调质热处理淬火冷却时也形成二次碳化物网;裂纹的产生主要是由于模具材料中存在非金属夹杂物等严重组织缺陷,模具设计有尖锐角也是导致早期脆性开裂的重要原因。A meso-level crack was found on the working surface of mold cavity after the finish machining of injection mold for a lampshade of cars. The injection mold is made of 1.2344 steel. The dye penetrating non-destructive testing,chemical composition analysis,macroscopic and microscopic morphology observation of the crack were carried out. The results show that there exist obvious microstructure defects,such as zonal segregation,carbide network and nonmetallic inclusions in the raw materials of mold. The secondary carbide network is formed in the quench cooling process of quenching and high temperature tempering. It is concluded that the obvious microstructure defects of material and a sharp angle in the mold result in the early brittleness cracking.

关 键 词：DIN1.2344钢 注塑模具 组织缺陷 尖锐角 裂纹 

分 类 号：TG115.213[金属学及工艺—物理冶金]