75硅铁型内孕育和非型内孕育的比较研究

摘要：本文采用75硅铁孕育剂对铸铁进行孕育处理，考察孕育剂加入量、孕育剂的粒度、孕育温度对铸铁孕育效果的影响。实验结果表明：灰铸铁经过孕育处理后，其石墨类型、石墨等级明显提高，孕育效果良好的灰铸铁其石墨组织更均匀，更细。在孕育剂粒度和孕育剂加入量一定的情况下，铸件的抗压强度随着浇注温度的升高而减小，浇注温度以1380-1420℃比较合适，在浇注温度和孕育剂粒度一定的情况下，铸件的抗压强度随着孕育剂的加入量的增加而增大。加入量在0.1－0.2％试样的孕育效果最佳。同理在浇注温度和孕育剂加入量一定的情况下，铸件的抗压强度随着孕育剂粒度的增加而增大，粒度为0.45-1.6mm的孕育效果最佳。上述实验均出现了一种特殊情况，在粒度为0.074mm时，实验结果不同于其他，这是因为基体组织中有珠光体，使它的抗压强度明显提高。35945
毕业论文关键词：孕育剂；型内孕育；铸铁；石墨组织
Study on the Inoculation In mould and Non-in mould within inoculation
Abstract
Silicon as inoculation was used in this experiments.The effects of inoculation method，pouring temperature，quantity of inoculation on inoculation of cast iron have been studied.The results showed that:After inoculating gray cast iron，graphite-type graphite grades improved significantly，the inoculation effect good gray iron graphite structure which is more uniform and more detailed.Inoculation on the particle size and the certain circumstances, for the amount of inoculation castings compressive strength decreases with the increase of pouring temperature, The pouring temperature of 1370-1450℃was more appropriate to the cast iron Inoculation on the particle size and the certain circumstances, for the amount of inoculation castings compressive strength decreases with the increase of pouring temperature, The best amount of inoculation was 0.1-0.15%.In pouring temperature and the inoculation addition amount of a certain situation, the compressive strength of castings as nucleating agent increases with increasing of the particle size, Inoculation particle size of 0.3-0.06mm gestation best.
Keywords:Inoculation;In mould Inoculation;Gray cast iron;Graphite organization
目录
1前言   1
1.1铸铁   1
1.2铸铁孕育机理   2
1.3铸铁孕育工艺方法   2
   1.3.1包内孕育   2
   1.3.2瞬时孕育   4
1.4型内孕育   4
   1.4.1工艺因素对型内孕育的影响   4
1.5研究目的及意义   7
1.6课题的研究内容和目标   7
   1.6.1研究内容   7
   1.6.2研究目标   7
2实验   8
2.1实验原材料   8
2.2实验设备   8
2.3实验方案   9
     2.3.1采用型内孕育方法孕育的铸铁   9
2.4实验过程   11
   2.4.1型内孕育实验过程   11
3实验结果与分析讨论   13
3.1灰铸铁中存在的石墨形态   13
3.2型内孕育的灰铸铁金相组织及抗压强度分析   15
   3.2.1孕育剂加入量对型内孕育效果的影响   15
   3.2.2浇注温度对型内孕育效果的影响   21
   3.2.3孕育剂粒度对型内孕育效果的影响   24
4结论   29
致谢   30
参考文献   31 75硅铁型内孕育和非型内孕育的比较研究:http://www.youerw.com/cailiao/lunwen_34168.html