Effect of Niobium on Solid Solution Temperature of Precipitates in Oriented Silicon Steel
-
摘要: 选用含铌0.09%和不含铌的两种铸坯,将铸坯分别加热至不同温度,并保温30 min后进行淬火处理,利用JEM-2011透射显微镜对试样的显微组织进行观察,同时在扫描电镜下确定铸态组织中黑色物质的形貌,通过观察析出物在不同温度下的数量分布情况,分析比较取向硅钢在含Nb和不含Nb两种状态下析出物的固溶温度。结果表明:含铌取向硅钢铸坯的晶粒尺寸与不含铌铸坯的晶粒尺寸相比更加均匀细小,铌元素有阻碍晶粒长大的作用;含Nb取向硅钢中析出物的完全固溶温度在1 250~1 300℃,不含Nb的析出物完全固溶温度在1 300℃以上,说明Nb能够明显降低析出物的完全固溶温度。Abstract: Two kinds of billets containing 0.09% niobium and niobium free were used for this study.The billets had been heated up to different temperatures and then quenched after holding for 30 min.The microstructure of the samples was observed by JEM-2011 transmission microscope.At the same time,the morphology of black material in as-cast microstructure was determined by scanning electron microscope(SEM).By observing the quantity distribution of precipitates obtained at different soaking temperatures,the effect of niobium addition on solid solution temperature of precipitates in Nb and Nb-free steels were compared and analyzed.The results show that:The grain size of niobium containing oriented silicon steel billet is more uniform and smaller than that of niobium-free billet.Niobium element can hinder grain growth.The complete solid solution temperature of precipitates in Nb-containing oriented silicon steel is between 1 250 ℃ and 1 300 ℃,and the total solid solution temperature of precipitates in steel without Nb is above 1 300 ℃,indicating that Nb can obviously reduce the complete solid solution temperature of precipitates.
-
Key words:
- oriented silicon steel /
- Nb /
- precipitate /
- complete solution temperature
点击查看大图
计量
- 文章访问数: 18
- HTML全文浏览量: 7
- PDF下载量: 1
- 被引次数: 0