纳米(NbTi)C颗粒合成及其对45钢铸态组织的影响
首发时间:2015-12-23
摘要:采用机械合金热激活发制备了纳米(NbTi)C/Fe复合粉末,并研究了纳米(NbTi)C颗粒对45钢铸铁组织和硬度的影响,结果表明:采用机械合金热激活法能快速制备纳米(NbTi)C/Fe复合粉末,(NbTi)C的颗粒尺寸约为200~400 nm,并均匀地分布在Fe基体中;在45钢熔炼过程中添加纳米(NbTi)C/Fe复合粉末,纳米(NbTi)C易于在液相中均匀分散;纳米(NbTi)C颗粒能够促进奥氏体形核并抑制奥氏体晶粒长大,显著细化其铸态组织,提高其硬度。
关键词: 材料学 机械合金热激活发 纳米(NbTi)C颗粒 组织细化 硬度
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Preparation of nano-(NbTi)C particle and its effect on as-cast microstructure of 45 steel
Abstract:The nano-(NbTi)C/Fe composite powder has been prepared by method of mechanical activation and thermal synthesis, and then the effects of nano-(NbTi)C particle on as-cast microstructure of 45 steel have been investigated. The results show that the nano-(NbTi)C/Fe composite powder could be quickly prepared by the mechanical activation and thermal synthesis technique. The size of the nano-(NbTi)C particle is about 200~400 nm, and nano-(NbTi)C particles distribute uniformly in Fe matrix. As the nano-(NbTi)C/Fe composite powder was added in molten metal of 45 steel during smelting process, the nano-(NbTi)C particle was easily distribute in molten metal. The nano-(NbTi)C particle can promote the nucleation and inhibit the growth of austenite, furthermore, refine the as-cast microstructure, and increase the hardness.
Keywords: materials mechanical activation and thermal synthesis technique nano-(NbTi)C particle microstructure refinement hardness
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No.4671225891221144****
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