期刊
ADDITIVE MANUFACTURING
卷 57, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.addma.2022.102958
关键词
Inconel 625; Additive Manufacturing; Microstructure; Texture; Mechanical Properties
资金
- National Natural Science Foundation of China [51 601 091, 51 971 112]
- Natural Science Foundation of Jiangsu Province [BK 20 160 826, BK 20 200 503]
- Six Talent Peaks Project of Jiangsu Province [2017-XCL-051]
- Fundamental Research Funds for the Central Universities [30 917 011 106, 30 919 011 405]
- Key Research and Development Plan of Jiangsu Province [BE 2 020 085]
- Fundacao para a Ciencia e a Tecnologia (FCT -MCTES) [UID/667/2020]
- CENIMAT/i3N through the FCT -Fundacao para a Ciencia e a Tecnologia, I.P. [UIDB/50 025/2020-2023]
The grain orientation and mechanical properties of Inconel 625 can be tailored by adjusting the process parameters. Increasing the current during directed energy deposition promotes the transition from columnar to equiaxed grains. The solidification conditions and mechanical properties were characterized and compared, revealing that samples with equiaxed grains have higher yield strength.
In this work, the grain orientation and mechanical properties of Inconel 625 are tailored by varying the process parameters during directed energy deposition. Under the same deposition speed, increasing the current is effective in promoting the columnar-to-equiaxed transition due to modifications on the thermal cycle. The solidification conditions (temperature gradient and cooling rate) were characterized during the process. A comparison with an existing solidification map for Inconel 625 indicates that the temperature gradients in the melt pool of the sample fabricated with larger current decrease sufficiently to permit the nucleation and growth of equiaxed grains. Uniaxial tensile testing showed that the sample with equiaxed grain microstructure exhibits a higher yield strength (increase by 36 %) when compared to the sample with columnar grains. Contributions of various strengthening mechanisms to the yield strength are quantified in terms of grain boundary strengthening, dislocation strengthening, and solid-solution strengthening. It is found that the higher yield strength of samples that possess equiaxed grains can be attributed to the enhanced dislocation strengthening arising from the large average Taylor factor.
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