Improvement of tensile properties of laser directed energy deposited IN718/316L functionally graded material via different heat treatments

被引:14
作者
Lu, Jiayang [1 ,2 ]
Li, Wenya [1 ,3 ]
机构
[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China
[2] Queen Mary Univ London Engn Sch, Northwestern Polytech Univ, Xian 710072, Peoples R China
[3] Northwestern Polytech Univ, Sch Mat & Engn, Xian 710072, Peoples R China
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2023年 / 866卷
基金
中国国家自然科学基金;
关键词
Laser directed energy deposition; Functionally graded material; Heat treatment; Wear resistance;
D O I
10.1016/j.msea.2023.144694
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Functionally graded materials (FGMs) always serve under rigorous circumstances requiring specific local properties. However, the inhomogeneity of FGMs makes their heat treatment (HT) difficult. Herein, the better HT method for laser directed energy deposited (LDED) IN718/316L FGM was achieved by investigating the microstructural evolution and mechanical properties after different HTs. The results showed that the ultimate tensile strength (UTS) and elongation of the specimen soluted at 1080 degrees C (HT2 specimen) were greater than those of both the as-built specimen (AB specimen) and the specimen soluted at 980 degrees C (HT1 specimen). The wear resistance in the building direction increased owing to increasing In718 powder content. After HT, the Laves phase was dissolved, and the delta, gamma ', and gamma '' phases were reprecipitated at the top region of the specimen (Region 1). Meanwhile, the thinner grains boundaries and transition from ferrite to austenite can be observed at both the middle region (Region 2) and bottom region (Region 3) of the specimen. Finally, the effect of HT on the mechanical properties was revealed.
引用
收藏
页数:10
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