快淬速度及合金元素添加对Nd_(2)Fe_(14)B/α-Fe纳米复相合金微观组织的影响  

Effect of Fast Quenching Speed and Alloying Element Addition on Microstructure of Nd_2Fe_(14)B/α-Fe Nanocomplex Alloy

作　　者：李冰蕾 王坤宇 张颖隆 冯运莉 LI Binglei;WANG Kunyu;ZHANG Yinglong;FENG Yunli(College of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063210,China)

机构地区：[1]华北理工大学冶金与能源学院,河北唐山063210

出　　处：《热加工工艺》2023年第17期44-47,51,共5页Hot Working Technology

基　　金：国家自然科学基金资助项目(51974134);河北省科技重大专项项目资助项目(21281008Z)。

摘　　要：通过真空电弧熔炼炉制备了Nd_(2)Fe_(14)B/α-Fe合金铸锭,对其铸态组织进行观察。观察发现,由于坩埚底部配有冷却系统,铸锭底部晶粒尺寸(15μm)小于顶部晶粒尺寸(50μm)。随后采用熔体快淬法将合金铸锭制备成Nd_(2)Fe_(14)B/α-Fe纳米复相合金薄带,研究了不同快淬速度对薄带微观组织的影响。结果表明,随着快淬速度的增加,薄带晶粒尺寸逐渐减小,当快淬速度为30 m/s时,晶粒尺寸达到最小255 nm。添加Ti、Nb元素后采用熔体快淬法制备了Nd_(2)(FeTiNb)_(14)B/α-Fe纳米复相合金薄带。结果是,当快淬速度为30 m/s时,薄带晶粒尺寸减小至约100 nm。The Nd_2Fe_(14)B/α-Fe alloy ingots were prepared by vacuum arc melting furnace,and the as-cast structure was observed.It is found that the grain size at the bottom of the ingots(15 μm) is smaller than that at the top(50 μm) due to the cooling system at the bottom of the crucible.Subsequently,the were,prepared form thin strips of Nd_2Fe_(14)B/α-Fe nano-complex alloy alloy ingots by the melt fast quenching method,and the effect of different rapid quenching speed on the microstructure of the thin strips was investigated.The results show that the grain size of the thin strip decreases gradually with the increase of rapid quenching speed,and the minimum grain size of 255 nm is reached when the rapid quenching speed is 30 m/s.The thin strip of Nd_2Fe_(14)B/α-Fe nano-complex alloy was prepared by the melt fast quenching method after the addition of Ti and Nb elements.As a result,the grain size of the thin strip is reduced to about 100 nm when the rapid quenching speed is 30 m/s.

关 键 词：Nd_(2)Fe_(14)B/α-Fe纳米复相合金 快淬速度 晶粒尺寸 Ti、Nb合金元素 

分 类 号：TG244.3[金属学及工艺—铸造] TG243