贺戬,乔绅,卫东雨,等.激光粉末床熔融AM247LC合金的成形性与显微组织特征[J].精密成形工程,2025,17(2):150-158.
HE Jian,QIAO Shen,WEI Dongyu,et al.Processability and Microstructure Characteristics of AM247LC Alloy via Laser Powder Bed Fusion[J].Journal of Netshape Forming Engineering,2025,17(2):150-158. |
| 激光粉末床熔融AM247LC合金的成形性与显微组织特征 |
| Processability and Microstructure Characteristics of AM247LC Alloy via Laser Powder Bed Fusion |
| 投稿时间：2023-10-26 |
| DOI：10.3969/j.issn.1674-6457.2025.02.017 |
| 中文关键词: 增材制造 镍基高温合金 微观组织 AM247LC合金 打印性 |
| 英文关键词: addictive manufacturing Ni-based superalloy microstructure AM247LC alloy printing performance |
| 基金项目:国家自然科学基金(52371012) |
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| 摘要点击次数: 258 |
| 全文下载次数: 18 |
| 中文摘要: |
| 目的 研究新型高铝钛镍基高温合金AM247LC的成形性、显微组织形貌与室温性能。方法 采用激光粉末床熔融方式制备了新型AM247LC合金，通过光镜和XRM进行成形性表征，利用SEM和TEM对AM247LC的晶粒组织与析出相等显微组织进行分析，并进行了AM247LC合金室温维氏硬度的测试。结果 激光粉末床熔融AM247LC合金在较大的工艺参数范围内具有良好的打印性能，致密度保持在99%以上，在选取的打印参数区间无裂纹产生，仅存在少量的孔洞;打印态合金的显微组织为典型的凝固胞状亚结构组织和缠结的高密度位错，在胞状亚结构的周围还分布有尺寸较小的颗粒。与CM247LC合金相比，LPBF制备的AM247LC合金的<001>织构强度明显变弱，晶粒平均尺寸变小，长径比缩小，在增材制造过程中，合金的沉淀物析出量大幅减少，样品的残余应力应变水平明显下降，因此AM247LC合金的开裂敏感性降低。AM247LC合金的室温性能优异，整体硬度为390HV~430HV，硬度值优于打印态CM247LC合金硬度。结论 激光粉末床熔融AM247LC合金不仅具备优异的增材制造成形性，而且具有良好的室温性能。 |
| 英文摘要: |
| The work aims to investigate the processability, microstructure and room temperature properties of the new high-aluminum titanium nickel-based superalloy, AM247LC. The AM247LC was prepared by laser powder bed fusion and its processability was characterized by optical microscopy and X-ray microscopy (XRM). The grain structure and precipitation phases of AM247LC were analyzed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The Vickers hardness of the AM247LC alloy at room temperature was also measured. The laser powder bed fusion AM247LC alloy exhibited good printing performance within a wide range of process parameters, with the density maintaining above 99%. There were no cracks and only a small number of holes existed in the selected printing parameter range. The typical solidified cellular substructure microstructure and entangled high-density dislocations were observed in the microstructure of LPBF-state alloys, with smaller particles distributed around the cellular substructure. Compared with CM247LC alloy, the <001> texture strength of AM247LC alloy was significantly weakened. The average size of grains was smaller and the aspect ratio was reduced. The amount of precipitation of the alloy during the additive manufacturing process was greatly reduced. Consequently, the stress and strain levels were significantly reduced, leading to a lower susceptibility to cracking. The AM247LC alloy displayed excellent performance at room temperature, with an overall hardness ranging from 390HV-430HV, which was better than that of LPBF CM247LC alloy. The AM247LC alloy, fabricated by laser powder bed fusion, exhibits not only outstanding additive manufacturing processability but also excellent performance at room temperature. |
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