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个人信息Personal Information
教授 博士生导师 硕士生导师
性别:男
毕业院校:南京航空航天大学
学历:博士研究生毕业
学位:工学博士学位
在职信息:在职
所在单位:机电与信息工程学院
入职时间:2011-03-09
办公地点:知行北楼305室
联系方式:rzliuyong@163.com
电子邮箱:rzliuyong@163.com
Effect of solution heat treatment on microstructure, mechanical and electrochemical properties of hastelloy X fabricated by laser powder bed fusion
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所属单位:Shandong University, Weihai
发表刊物:Journal of Materials Research and Technology
关键字:LPBFSolution treatmentOrthogonal experimentMaterial propertiesMicrostructureElectrochemical passivation characteristics
摘要:Laser Powder Bed Fusion (LPBF) technology provides a new way for integral forming and rapid manufacturing of complex components of Hastelloy X, but the parts fabricated by LPBF (LPBFed) inevitably have defects such as micropores, micro-cracks, and residual stress. To eliminate the above defects and further enhance the material properties of the Hastelloy X, solution heat treatment (SHT) was performed on the LPBFed parts. Although SHT can improve material properties, there are many limitations in using traditional machining because of the high hardness of Hastelloy X. So, electrochemical machining (ECM) is used to process LPBFed Hastelloy X parts and has a wide range of applications. Firstly, the optimal SHT process parameters with good comprehensive mechanical properties were obtained by orthogonal experiment, and the influence of the selection of SHT process parameters on the properties of LPBFed samples was discussed. Then, after SHT with optimized process parameters, the elongation after fracture (EAF) increases from 30.0% to 51.3%, and the ultimate tensile strength (UTS) reduces from 798.7 MPa to 732.6 MPa merely. Next, its micro-morphology was observed and analyzed. It can be seen that After the SHT, the grain size increases, and the low-angle grain boundary decreases in the XOY direction, resulting in the decrease of the intergranular area and dislocation densities to reduce the tensile strength. After the SHT, the molten pool boundary disappears in any direction, which greatly improves the plasticity of the part. and the microstructure explains the results of tensile tests. The experimental results show that the material properties of Hastelloy X can be greatly improved by this SHT process, which has great development potential and broad application prospects. Finally, to apply Hastelloy X to the Electrochemical machining (ECM) process, an experimental analysis of the electrochemical passivation performance of LPBFed samples after SHT with optimal parameters was carried out. The experimental results show that after SHT the denseness of the passivation film is improved, the corrosion resistance is enhanced, and the anisotropy of corrosion resistance is reduced. By observing the microscopic morphology of the passivation film, it can be seen that the corrosion products reduced and the number of corrosion pits decreased. This means LPBFed Hastelloy X parts after SHT is significantly improved and meets the ECM processing requirements.
全部作者:Tong Shu, Wenchao Guan, Shenghai Wang
第一作者:Chenxin Li
论文类型:Research Paper
通讯作者:Yong Liu
论文编号:10.1016/j.jmrt.2023.03.108
文献类型:Journal article
卷号:24
页面范围:1499-1512
ISSN号:2238-7854
是否译文:否
发表时间:4508-09-01