激冷铸铁凸轮轴“黑线”的形成机理及对策  

Formation Mechanism and Prevention of"Black Line"in Section of Chilled Cast Iron Camshaft

作　　者：沈保罗[1] 李莉[2] 岳昌林[2] 何勇[2] 沈晓海[2] 

机构地区：[1]四川大学材料科学与工程学院,四川成都610064 [2]成都金顶凸轮轴铸造有限公司,四川郫县611732

出　　处：《现代铸铁》2009年第5期64-67,共4页Modern Cast Iron

摘　　要：综述国内外铸造工作者对激冷铸造凸轮轴"黑线"缺陷的认识过程,认为:铁碳合金同时具有稳定系共晶以及介稳定系共晶两个共晶反应是导致"黑线"产生的根本原因。根据生产实践,提出了合理选择浇注位置、合理设计冷铁、适当降低w(Si)量和提高w(Cr)量等多项措施,可以防止"黑线"缺陷的产生。The process of understanding the'black line'defect in the section of chilled cast iron camshaft by the chinese and foreign foundrymen was summarized.It's considered that the fundamental reason causing formation of'black line'is that the Fe -C alloy has the eutectic reaction of both stable system and metastable system.Based on production practice,some countermeasures which can be adopted to prevent 'black line'defect were proposed including:reasonably selecting pouring position,properly designing chills,properly reducing w(Si) and increasing w(Cr),and so on.

关 键 词：激冷铸铁 凸轮轴 黑线 形成机理 对策 

分 类 号：TG250.6[金属学及工艺—铸造]