紧耦合真空气雾化制备Fe-Cr合金粉末的特性表征

兰州理工大学学报 ›› 2021, Vol. 47 ›› Issue (3): 10-14.

紧耦合真空气雾化制备Fe-Cr合金粉末的特性表征

尹燕^*1, 董开基¹, 李治恒², 薄尧¹, 路超³, 张瑞华^3,4

1.兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室, 甘肃兰州 730050;
2.新疆大学机械工程学院, 新疆乌鲁木齐 830047;
3.中国钢研科技集团有限公司, 北京 100081;
4.阳江市五金刀剪产业技术研究院, 广东阳江 529533

收稿日期:2021-01-26 出版日期:2021-06-28 发布日期:2021-07-19
通讯作者: 尹燕(1973-),女,四川西昌人,博士,教授.Email:yinyan@lut.cn
基金资助:
阳江市重大科技专项(2018002),阳江市高功率激光应用实验室建设(2018057),广东省科技计划项目(20180902)

Characterization of Fe-Cr alloy powder prepared by close-coupled vacuum induction melting gas atomization

YIN Yan¹, DONG Kai-ji¹, LI Zhi-heng², BO Yao¹, LU Chao³, ZHANG Rui-hua^3,4

1. State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou Univ. of Tech., Lanzhou 730050, China;
2. School of Mechanical Engineering, Xinjiang University, Urumqi 830047, China;
3. Central Iron and Steel Research Institute, Beijing 100081, China;
4. Yangjiang Hardware Knife Cut Industrial Technology Research Institute, Yangjiang 529533, China

Received:2021-01-26 Online:2021-06-28 Published:2021-07-19

摘要/Abstract

摘要： 采用紧耦合真空气雾化法制备Fe-Cr合金粉末,通过不同目数的筛网进行筛分,得到0~25 μm、25~53μm、53~105 μm、105~150 μm四个粒度段的粉末.使用氧氮分析仪、碳硫分析仪、电感耦合等离子体发射光谱仪分析雾化前后粉末化学成分,测定全粒度段及各粒度段的氧含量变化情况;采用扫描电镜、激光粒度仪等分析测试手段观察粉末表面形貌及表面微观组织并测定粉末粒径.结果表明:紧耦合真空气雾化制备Fe-Cr金属粉末化学成分可精确控制,全粒度段氧含量为0.024wt.%;冷却速度随粉末粒径的减小呈现指数级增长,随着粉末粒度段的增大,表面组织主要由胞状晶、柱状晶向树枝晶发展;各粒度段氧含量随粒径增大逐渐减小;空心粉的形成主要与袋式破碎机制和晶粒凝固收缩差有关.

关键词: 气雾化, 氧含量, 表面微观组织, 空心粉

Abstract: Fe-Cr alloy powders were prepared by close-coupled vacuum induction melting gas atomization and shifted through different mesh sizes to obtain powders with four particle size segments of 0-25 μm、25-53 μm、53-105 μm and 105-150 μm. Oxygen and nitrogen analyzer, carbon and sulfur analyzer and inductively coupled plasma emission spectrometer were used to analyze the chemical composition of powder before and after atomization, and the change of oxygen content in all particle size segments and each particle size segment. SEM and laser particle size analyzer were used to observe the surface morphology and microstructure of powder and determine the particle size. The results showed that the chemical composition of Fe-Cr metal powder prepared by close-coupled vacuum induction melting gas atomization can be precisely controlled, and the oxygen content in full-size section was 0.024wt.%. The cooling rate increased exponentially with the decrease of powder particle size. With the increase of powder particle size segment, the surface structure mainly developed from cellular and columnar crystals to dendritic crystals. The oxygen content in each grain size segment decreased with the increase of grain size. The formation of hollow powder was mainly related to bag crushing mechanism and grain solidification shrinkage difference.

Key words: gas atomization, oxygen content, surface microstructure, hollow powder

中图分类号:

TG495
TF455

尹燕, 董开基, 李治恒, 薄尧, 路超, 张瑞华. 紧耦合真空气雾化制备Fe-Cr合金粉末的特性表征[J]. 兰州理工大学学报, 2021, 47(3): 10-14.

YIN Yan, DONG Kai-ji, LI Zhi-heng, BO Yao, LU Chao, ZHANG Rui-hua. Characterization of Fe-Cr alloy powder prepared by close-coupled vacuum induction melting gas atomization[J]. Journal of Lanzhou University of Technology, 2021, 47(3): 10-14.

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