球铁钢锭模蚀坑与网裂失效分析  

Corrosion Pit and Map Cracking Failure Analysis on Ductile Iron Ingot Mold

作　　者：刘增辉[1] 崔新鹏[1] 李国和[2] 郑宝安[2] 吴春京[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]西宁特殊钢股份有限公司,青海西宁810005

出　　处：《铸造技术》2013年第12期1666-1668,共3页Foundry Technology

基　　金：国家自然科学基金资助项目(51274038)

摘　　要：结合某军品项目进行研究,对激光快速成型预烧结喷管件进行高温烧结试验和还原气氛二步烧结试验,测试制件的各项性能,确定此喷管件是否有进行还原气氛二步烧结的必要,并对Mo粉末高温烧结机理进行理论分析,说明高温烧结改善坯体性能的原因。试验表明,经过还原气氛二步烧结的结构件才能达到某喷管的性能要求,且高温烧结理论分析解释了这一原因。Aimed at ingot mould corrosion pit and map cracking failure problem on the scene, the microstructure observation and inclusions composition analysis were conducted by means of metallographic microscope and scanning electron microscopy （SEM）. The preprocessing of nodularizer and nucleating agent were improved using thermogravimetric analysis and differential thermal analysis. The results show that corrosion pit and map cracking failure relate to the oxidation of the hereditary and inoculants of cast iron raw material.

关 键 词：球铁 钢锭模 网裂 蚀坑 

分 类 号：TF124.5[冶金工程—粉末冶金]