基于热分析技术的球墨铸铁组织性能预测  

Microstructure Performance Prediction of Ductile Iron Based on Thermal Analysis Technology

作　　者：杨湘杰[1,2] 李锟 杨明浩 邓博焰 刘钦标 叶寒 YANG Xiang-jie;LI Kun;YANG Ming-hao;DENG Bo-yan;LIU Qin-biao;YE Han(School of Advanced Manufacturing,Nanchang University,Nanchang 330031,Jiangxi,China;Key Laboratory of High Performance Precision Forming in Jiangxi Province,Nanchang 330031,Jiangxi,China)

机构地区：[1]南昌大学先进制造学院,江西南昌330031 [2]江西省高性能精确成形重点实验室,江西南昌330031

出　　处：《铸造》2025年第1期16-25,共10页Foundry

摘　　要：通过单变量试验分别研究了不同新型球化剂、孕育剂加入后的球墨铸铁热分析曲线特征值对收缩倾向及球化效果的影响规律,并利用SPSS回归分析软件建立了曲线特征值与收缩倾向、球化率关联性的数学模型。研究结果表明,在其他因素相同时,共晶再辉温度ΔT越大,共晶反应速度越快,平均石墨球数越少,球化级别越差;球化率、石墨球数随着共晶最低温度TEU的升高而逐渐上升。前期收缩时间比例G1/G所占的时间越长,被测铁液的缩孔率越大;石墨化膨胀时间比例G2/G越长,则被测缩松率越大;并且建立了曲线特征值与收缩倾向、球化率的数学模型,该模型能够准确预测球化率和收缩倾向。The influence rules of the characteristic values of the thermal analysis curves of ductile irons on the shrinkage tendency and nodularization effect after adding different new nodularizers and inoculants were investigated respectively through univariate experiments,and the relationship mathematical models between the curve eigenvalues,shrinkage tendency and nodularity rate were established by SPSS regression analysis software.The investigation results show that when other factors are the same,the larger the eutectic reglow temperature ΔT,the faster the eutectic reaction speed,the fewer the average graphite sphere number,and the worse the nodularization level.The nodularity rate and graphite spheroid number gradually increased with the increase of the eutectic minimum temperature TEU.The longer the time occupied by the previous shrinkage time ratio G1/G,the greater the shrinkage rate of molten iron to be measured.The longer the graphitization expansion time ratio G2/G,the greater the dispersed shrinkage rate measured.In addition,a mathematical model of curve eigenvalue,shrinkage tendency and nodularity rate is established,which can accurately predict the nodularity rate and shrinkage tendency.

关 键 词：球墨铸铁 热分析技术 收缩倾向 球化效果 金相图像处理 

分 类 号：TG143.5[一般工业技术—材料科学与工程]