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材料导报  2023, Vol. 37 Issue (21): 22040096-7    https://doi.org/10.11896/cldb.22040096
  金属与金属基复合材料 |
选区激光熔化IN718合金固溶过程成分均匀化规律的研究
曹宇1,2,3, 白朴存1,*, 刘飞1, 侯小虎1
1 内蒙古工业大学材料科学与工程学院,呼和浩特 015000
2 呼伦贝尔学院机电工程学院,内蒙古 呼伦贝尔 021008
3 内蒙古自治区高校矿产资源安全开采与综合利用工程研究中心,内蒙古 呼伦贝尔 021008
Study on Composition Homogenization of IN718 Alloy Fabricated by Selective Laser Melting During Solid Solution Treatment
CAO Yu1,2,3, BAI Pucun1,*, LIU Fei1, HOU Xiaohu1
1 School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 015000, China
2 School of Mechanical and Electrical Engineering, Hulunbuir University, Hulunbuir 021008, Inner Mongolia, China
3 Research Center for Mining and Comprehensive Utilization of Mineral Resources of Inner Mongolia Autonomous Region, Hulunbuir 021008, Inner Mongolia, China
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摘要 选区激光熔化技术具有成形自由度高、成形精度高、成形效率高的优势,在高温合金的曲面结构的制造中具有巨大的应用潜力。本工作采用选区激光熔化技术制备IN718合金,并对合金进行不同条件下的固溶热处理,利用SEM、TEM以及XRD等多种手段研究了沉积态合金中的成分偏析、析出相的分布、固溶过程中成分均匀化的规律、最短固溶时间和固溶温度之间的函数关系,以及固溶冷却过程中析出相的形成过程。结果表明:合金制备过程中较快的凝固速率使得合金在晶界处及亚结构的边界处产生了Nb、Ti元素的成分偏析带,偏析带的厚度约为50 nm,并且在成分偏析带形成了Laves相和MX相。在高于980 ℃的条件下对沉积态合金进行固溶处理,成分偏析带回溶,最短固溶时间与最低固溶温度的关系为:$t=\frac{1}{3167} \cdot \exp \left(\frac{21597}{T}\right)$。固溶后较低的冷却速率会使合金中产生γ″相,增加合金的硬度。
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曹宇
白朴存
刘飞
侯小虎
关键词:  选区激光熔化  IN718合金  均匀化  析出相    
Abstract: Selective laser melting technology has the advantages of high forming freedom, high forming precision and high forming efficiency. It has great application potential in manufacturing curved surface structure of superalloy. In this work, IN718 alloy was prepared by selective laser melting technology, and the alloy was subjected to solution heat treatment under different conditions. The composition segregation, the distribution of precipitates, the law of composition homogenization in the process of solution, the functional relationship between the shortest solution time and solution temperature, and the formation process of precipitates in the process of solution cooling were studied by means of SEM, TEM and XRD. The results show that the faster solidification rate during the preparation of the alloy makes the composition segregation band of Nb and Ti elements appear at the grain boundary and the boundary of substructure. The thickness of the segregation band is about 50 nm, and Laves phase and MX phase are formed in the composition segregation band. When the temperature is higher than 980 ℃, the component segregation will solute to the matrix. The relationship between the shortest solution time andthe lowest solution temperature is:$t=\frac{1}{3167} \cdot \exp \left(\frac{21597}{T}\right)$. The lower cooling rate will cause the formation of γ″ phase during solution cooling process, which will increase the hardness of the alloy.
Key words:  selective laser melting    IN718 alloy    composition homogenization    precipitates
出版日期:  2023-11-10      发布日期:  2023-11-10
ZTFLH:  TG156  
基金资助: 国家自然科学基金(11672140);内蒙古自治区矿产资源安全开采与综合利用研究中心重点项目(2021KZZD04);内蒙古自治区高校科研一般项目(NJZY23051);中央引导地方科技发展资金(2022ZY0183)
通讯作者:  *白朴存,内蒙古工业大学材料科学与工程学院教授。1989年本科毕业于内蒙古工学院材料工艺系铸造工艺与设备专业,获得工学学士学位;1992年于西安交通大学机械工程系铸造专业获得工学硕士学位;2003年于北京航空航天大学材料科学与工程学院材料学专业获得工学博士学位。主要从事有色金属材料特种制备、金属材料激光增材制造、材料微观组织结构分析与表征、材料服役性能评价等研究工作。在国内外学术期刊上已发表学术论文80余篇,其中SCI/EI 收录40余篇;授权发明专利5项。Pcbai@imut.edu.cn   
作者简介:  曹宇,2012年7月在山东大学取得硕士学位,2021年7月在内蒙古工业大学取得博士学位,2021年9月进入内蒙古工业大学博士后流动工作站,导师为白朴存教授。目前主要的研究领域为:激光增材制造高温合金的微观组织结构和微观力学行为。
引用本文:    
曹宇, 白朴存, 刘飞, 侯小虎. 选区激光熔化IN718合金固溶过程成分均匀化规律的研究[J]. 材料导报, 2023, 37(21): 22040096-7.
CAO Yu, BAI Pucun, LIU Fei, HOU Xiaohu. Study on Composition Homogenization of IN718 Alloy Fabricated by Selective Laser Melting During Solid Solution Treatment. Materials Reports, 2023, 37(21): 22040096-7.
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http://www.mater-rep.com/CN/10.11896/cldb.22040096  或          http://www.mater-rep.com/CN/Y2023/V37/I21/22040096
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