| 激光立体成形Rene88DT镍基高温合金沉积态组织研究 |
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| 引用本文： | 杨海欧,赵宇凡,许建军,林鑫,黄卫东,侯运安.激光立体成形Rene88DT镍基高温合金沉积态组织研究[J].精密成形工程,2019,11(4):9-14. |
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| 作者姓名： | 杨海欧 赵宇凡 许建军 林鑫 黄卫东 侯运安 |
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| 作者单位： | 西北工业大学 凝固技术国家重点实验室,西安 710072;西北工业大学 金属高性能增材制造与创新设计工业和信息化部重点实验室,西安 710072;中国航发西安航空发动机有限公司计量中心,西安,710021 |
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| 基金项目： | 国家重点研发计划（2018YFB1105804）；民用飞机专项科研（MJ-2017-G-63） |
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| 摘 要： | 目的基于激光立体成形(Laser Solid Forming, LSF)过程中所存在的近快速凝固特性,以Rene88DT合金为研究对象,考察激光立体成形Rene88DT沉积态微观组织特征和相形成规律。方法通过LSF技术制备Rene88DT镍基高温合金单道沉积试样,采用光学显微镜(OM)和扫描电子显微镜(SEM)对组织进行观察,并用能谱仪(EDS)对试样中的析出相及微区成分进行分析。结果激光立体成形Rene88DT合金沉积态组织主要由沿趋于平行沉积方向生长的γ柱状晶组成,由于枝晶偏析的存在,以富Nb为主的块状MC碳化物以及板条状η(Ni_3Ti)相于枝晶间区域析出。随着沉积高度的增加,一次枝晶臂间距有所增大,二次枝晶臂逐渐发达,同时,γ'相体积分数和尺寸逐渐减小,沉积层的硬度相应降低。结论尽管激光立体成形熔池凝固已属于近快速凝固范围,熔池凝固过程中,溶质原子同样易于在晶界处形成偏聚,导致晶界弱化,在成形热应力作用下易形成沿晶裂纹。
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| 关 键 词： | 激光立体成形(LSF) 增材制造 Rene88DT合金 组织 相组成 |
| 收稿时间： | 2019/6/28 0:00:00 |
| 修稿时间： | 2019/7/10 0:00:00 |
AS-Deposited Microstructures of Rene88DT Nickel-base Superalloy by Laser Solid Forming |
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| YANG Hai-ou,ZHAO Yu-fan,XU Jian-jun,LIN Xin,HUANG Wei-dong and HOU Yun-an.AS-Deposited Microstructures of Rene88DT Nickel-base Superalloy by Laser Solid Forming[J].Journal of Netshape Forming Engineering,2019,11(4):9-14. |
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| Authors: | YANG Hai-ou ZHAO Yu-fan XU Jian-jun LIN Xin HUANG Wei-dong and HOU Yun-an |
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| Affiliation: | 1. a. State Key Laboratory of Solidification Processing; b. Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design, Northwestern Polytechnical University, Xi''an 710072, China,1. a. State Key Laboratory of Solidification Processing; b. Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design, Northwestern Polytechnical University, Xi''an 710072, China,1. a. State Key Laboratory of Solidification Processing; b. Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design, Northwestern Polytechnical University, Xi''an 710072, China,1. a. State Key Laboratory of Solidification Processing; b. Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design, Northwestern Polytechnical University, Xi''an 710072, China,1. a. State Key Laboratory of Solidification Processing; b. Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design, Northwestern Polytechnical University, Xi''an 710072, China and 2. Metrology Center, AECC Xi''an Aero-Engine Company Limited, Xi''an 710021, China |
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| Abstract: | |
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| Keywords: | laser solid forming (LSF) additive manufacturing Rene88DT alloy microstructure phases constitution |
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