灰铸铁低频内耗与孕育量及组织的关系研究  

Study on Correlation between Low-Frequency Internal Friction and Inoculant Addition & Structure

作　　者：彭金花[1] 汤虎[1] 陈萌[1] 杨弋涛[1] 

机构地区：[1]上海大学材料科学与工程学院,上海200072

出　　处：《现代铸铁》2011年第3期52-57,共6页Modern Cast Iron

摘　　要：运用低频内耗谱分析和光学显微镜观察,研究了灰铸铁阶梯试样在不同孕育剂加入量下的微观组织与内耗的关系。试验结果表明:随着温度的升高,内耗值先增加后减小;冷却速度较大,得到菊花状石墨时内耗值最小;石墨面积越大,内耗值就越大,石墨越细小,内耗值就越小。试验结果可望作为灰铸铁减振特性的科学表征。By analyzing with low frequency internal friction spectrum and observing with optical microscopy,the correlation between microstructures of the gray cast iron step specimen resulted from different inoculant adding amount and their internal friction was studied.The test results showed that,with increasing of the temperature,the internal friction value increased at first,and then decreased;when cooling rate was high,B-type（chrysanthemum-shaped） graphite and the lowest internal friction value was obtained;the larger the area of graphite,the higher internal friction value;the smaller the graphite size,the smaller the internal friction value.It may be expected that the test result can be used as the scientific representation of the damping characteristics of the gray cast irons.

关 键 词：灰铸铁 内耗 孕育量 组织 

分 类 号：TG251[金属学及工艺—铸造]