MS-G技术调控Nd-Fe-B铸态组织研究
Microstructure Regulation of As-cast Nd-Fe-B Alloy by MS-G Technology
马斌 1张鹏杰 1王继全 1李青华 2李炳山 1孙威2
作者信息
- 1. 矿冶科技集团有限公司,北京 102600;北矿磁材(阜阳)有限公司,安徽阜阳 236000
- 2. 矿冶科技集团有限公司,北京 102600
- 折叠
摘要
采用熔体快淬+晶体生长(MS-G)技术调控Nd-Fe-B铸态组织,研究了铜辊转速及高温热处理对Nd-Fe-B快淬条带组织结构的影响.铜辊转速25 m·s-1时快淬条带微观晶粒组织均匀,平均晶粒尺寸0.1 μm,XRD图谱显示其为Nd2Fe14B相.Nd-Fe-B快淬条带经880 ℃热处理2.0 h晶粒均匀长大,平均尺寸0.86 μm;冷却到750 ℃继续热处理2.0 h晶粒进一步均匀长大,平均尺寸达到1.04 μm.温度升高会降低Nd2Fe14B晶粒异常长大临界驱动力△gc,缩短异常长大的孕育期,使异常晶粒提早出现,高温+低温两步热处理通过降温处理来延长晶粒异常长大孕育期,从而促进Nd2Fe14B晶粒在较低温度下继续均匀长大.
Abstract
In this study,the as-cast Nd-Fe-B alloy was treated by the melt-spun and grain growth(MS-G)tech-nology,and the effects of copper roll speed and high temperature treatment on the microstructure of Nd-Fe-B melt-spun strip were investigated.The melt-spun strip shows uniform grain structure with grain size of 0.1 μm at roll speed of 25 m·s-1 and the XRD pattern shows diffraction peaks of Nd2Fe14B phase.The Nd2Fe14B grains in 25 m·s-1 melt-spun strip grow uniformly to 0.6 μm when treated at 880 ℃ for 2.0 h,and then further grow to 1.04 μm after the second heat treatment at 750 ℃ for 2.0 h.The increase of temperature will reduce the critical driving force △gc for abnormal growth of Nd2Fe14B grains,as a result,shorten the incubation period and result in the earlier appearance of abnormal grains.The two-step heat treatment prolongs the incubation period of ab-normal grain growth by cooling treatment,thereby,promoting the Nd2Fe14B grains to grow uniformly at a lower temperature.
关键词
钕铁硼/熔体快淬/晶体生长/两步热处理/铸态组织Key words
Nd-Fe-B/melt-spun/grain growth/two-step heat treatment/as-cast microstructure引用本文复制引用
基金项目
国家重点研发计划"稀土新材料"重点专项2021年度青年科学家项目(YFB3502400)
出版年
2024
NETL
NSTL
万方数据