基于定量取样杯的凝固曲线与石墨形态的判据研究  

Study on the Criterion of the Graphite Morphology and Solidification Curve Based on the Quantitative Sampling-Cup

作　　者：徐倩[1,2] 杨湘杰[1,2] 叶寒[1,2] 熊贵根 徐万里[3] 李超[1,2] 

机构地区：[1]南昌大学机电工程学院,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 [3]江铃铸造厂,江西南昌330031

出　　处：《铸造》2015年第1期37-40,共4页Foundry

基　　金：江西省高等学校科技落地计划项目(KJLD13005)

摘　　要：采用定量取样杯研究热分析曲线特征值、热分析曲线整体形状与石墨形态之间的关系。结果表明:特征值TEU(共晶最低温度)、TER(共晶最高温度)与石墨形态之间存在一定的关系;TEU≥1 140℃,TER≥1 153℃时,石墨为片状;当1 130℃≤TEU≤1 140℃,1 150℃≤TER≤1 153℃时,石墨为蠕虫状加球状,蠕虫状居多;当1 130℃≤TEU≤1140℃,1 143℃≤TER≤1 150℃时,石墨为蠕虫状加球状,球状居多。拟通过热分析曲线相似程度参数Ω对凝固试样蠕化率进行定量评估。当Ω≤10时,其石墨形态近似。Using quantitative sampling cup analysis, the relationship between thermal analysis curve characteristic, the overall shape of the thermal analysis curves and graphite morphology was analyzed. The results show that there is a relationship between the eigenvalue TEU（temperature of eutectic undercooling）, TER （temperature of eutectic arrest） and the graphite morphology;, when TEU ≥ 1 140 ℃, TER ≥ 1 153℃, the graphite morphology are flake; when 1 130 ℃ ≤TEU≤1140 ℃, 1 150 ℃ ≤TER≤1153 ℃, the graphite morphology are compacted and spheroidal, but compacted are more, when 1 130 ℃ ≤ TEU ≤ 1 140 ℃, 1 150 ℃ ≤TER ≤1 153 ℃, the graphite morphology are compacted and spheroidal, but spheroidal are more. The reference number/2, can quantitatively evaluate the creep rate. When Ω≤10, the graphite morphology approximately is similar.

关 键 词：热分析曲线 石墨形态 共晶最低温度 共晶最高温度 再辉温度 

分 类 号：TG250[金属学及工艺—铸造]