التفاصيل البيبلوغرافية
| العنوان: |
In situ TiC/Inconel 625 nanocomposites fabricated by selective laser melting: Densification behavior, microstructure evolution, and wear properties. |
| المؤلفون: |
Chen, Lan1 (AUTHOR), Sun, Yuzhou1 (AUTHOR), Li, Lin2 (AUTHOR), Ren, Yunpeng1 (AUTHOR), Ren, Xudong1 (AUTHOR) renxd@mail.ujs.edu.cn |
| المصدر: |
Applied Surface Science. Jul2020, Vol. 518, pN.PAG-N.PAG. 1p. |
| مصطلحات موضوعية: |
*MICROSTRUCTURE, *MECHANICAL wear, *INCONEL, *LASERS, *DISLOCATION structure, *CRYSTAL grain boundaries, *TITANIUM composites |
| مستخلص: |
• Relatively dense TiC/IN625 nanocomposites were manufactured by SLM. • The TiC/IN625 nanocomposites exhibited refinement microstructure with high density of dislocation structures. • The microstructural evolution of TiC/IN625 nanocomposites at different laser fluences was investigated. • The wear performance and mechanism of TiC/IN625 nanocomposites were studied. An Inconel 625-based nanocomposite reinforced with TiC nanoparticles (TiC/IN625) was successfully prepared by selective laser melting. The effects of laser fluence on the densification, microstructure, crystal structure, microhardness, and wear performance of the prepared nanocomposites were systematically investigated. A low laser fluence induced many defects, such as pores, cavities, and unmelted particles, whereas a high laser fluence resulted in a significantly increased densification. The increase in the laser fluence resulted in the continuous development of the microstructure of TiC/IN625 nanocomposites. A laser fluence of 139 J/mm3 led to insufficient growth, while a sufficient growth was achieved at the laser fluence of 167 J/mm3; at 208 J/mm3, refined columnar/cellular dendrites were formed. Compared to IN625, smaller grains (less than 5 μm) and a larger proportion of sub-grain boundaries appeared in the TiC/IN625 nanocomposites due to grain refinement. The TiC phases precipitated in situ in the grain boundaries, and a high level of dislocation was introduced into the TiC/IN625 nanocomposites. The maximum microhardness of the TiC/IN625 nanocomposites was 440 HV at the laser fluence of 208 J/mm3. The lowest coefficient of friction and wear rate were 0.33 and 3.5 × 10−4 mm3 N−1m−1, respectively. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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