呋喃树脂砂对超低碳钢铸件增碳缺陷的影响  

Effect of Furan Resin Sand on Carburization Defects of Ultra-Low Carbon Steel Casting

作　　者：赵岭[1] 田雨[1] 王云霞[1] 杜丘[1] 蒋国森[1] 于洪若[1] 唐骥[1] 赵玉华[2] 

机构地区：[1]沈阳铸造研究所,辽宁沈阳110022 [2]沈阳航空航天大学,辽宁沈阳110136

出　　处：《铸造》2014年第9期929-933,共5页Foundry

摘　　要：应用呋喃树脂砂制备超低碳钢试验件,采用直读光谱成分分析、电子探针扫描、显微金相和力学性能测量等实验方法分析研究低碳钢试验件表层增碳规律和增碳机理.研究结果表明：呋喃树脂砂型（芯）表面的树脂粘结剂在高温金属液的作用下,树脂分解直接生成碳原子和燃烧生成CO2、CO、CH4等气体,气体在界面解离生成碳原子,这些碳原子直接溶解进入钢液,随着凝固的进行向钢液内部扩散,造成试验件表面出现严重增碳现象,表层含碳量达到本体含碳量的2～7倍,增碳层深度达到8～12 mm.表层硬度随着含碳量的增加而增加,表层显微组织中会出现针状马氏体组织;随着试验件壁厚的增加,表面含碳量和增碳层深度都有所增加.Using furan resin sand to produce test pieces of ultra-low carbon steel,carburization rule and mechanism of ultra-low carbon steel test pieces surface were researched by using spectral analysis,electron probe scanning,microscopic metallographic analysis and mechanical test and so on.The research showed that test pieces surface carburization was very serious,the carbon content on test pieces surface was 2 to 7 times than that of test pieces body,and depth of carburizing layer reach to 8-12 mm.The reason of the above mentioned results is that the resin decomposed into carbon atom and CO2,CO,CH4,etc.gases which dissociated into carbon atom in the interface of the liquid steel.These carbon atoms dissolve directly into liquid steel and inward diffuse with liquid steel solidifying.This process caused test pieces surface carburization.The research also showed surface hardness of test pieces was increased with the carbon content increasing,and needle type martensite was found in the surface layer microstructure.With the thickness of test pieces increasing,the content and depth of carburization were increased.

关 键 词：超低碳钢铸件 增碳 呋喃树脂砂 工艺 显微组织 

分 类 号：TG22[金属学及工艺—铸造] TG245