微合金梯度石墨铸铁玻璃模具材料研究  

Study of Microalloying Graphite Gradient Cast Iron in Glass Mould Material

作　　者：杨明[1] 黄新民[1] 吴玉程[1] 秦兴国[1] 晏广华[1] 王艳青[1] 

机构地区：[1]合肥工业大学材料科学与工程学院,安徽合肥230009

出　　处：《金属功能材料》2011年第3期50-54,共5页Metallic Functional Materials

摘　　要：本文通过控制铸铁生产中的合金元素量、浇注温度、孕育剂量,得到在模具壁厚方向形成三级梯度石墨灰铸铁。利用SEM观察金相试样评价石墨形态、尺寸、分布;测试试样各梯度石墨区域的布氏硬度值评价铸铁的力学性能;观察热疲劳试样的疲劳裂纹的扩展评价试样的热力学性能。试验结果发现合金元素量V：0.11%~0.15%、Ti：0.15%~0.21%、浇注温度1360~1320℃、孕育剂量在0.35%~0.50%,模具在内腔区形成细小D型石墨,模具腔壁石墨逐渐长大B型,最后形成A型石墨的三级梯度石墨结构;梯度石墨结构兼顾内腔区模腔表面质量良好、径向高效散热能力和优异的耐热疲劳性能。By controlling the pouring temperature,alloying elements the inoculant,a triple grades of graphite gradient cast iron in radius orientation of the glass mould are made.The morphology of the metallographic samples was studied by scanning electron microscopy;By testing of brinell hardness on the different region of samples,different hardness value are obtained;Test results showed that the alloy contains 0.11 ~ 0.15% V,0.15% ~ 0.21% Ti and 0.35% ~ 0.50% inoculant,The glass mold consists of three layers,where the fine D-type graphite was main composition of inner layer and A-type graphite covered the outer layer of the mold.The dies made from a structure gradient offers high surface smoothness of the mold,high thermal conductivity and thermal fatigue resistance along the die wall.

关 键 词：灰铸铁 梯度石墨 模具 热疲劳 

分 类 号：TG255[金属学及工艺—铸造]