预热温度对激光选区熔化成形30%SiC<sub>p</sub>/AlSi10Mg复合材料力学性能的影响

doi:10.11896/cldb.22090016

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Abstract Selective laser melting of medium volume fraction SiC_p/Al composites under ambient temperature substrate conditions suffers from metallurgical defects such as holes and cracks, which in turn lead to low densities and poor mechanical properties of the fabricated parts. The influence of a substrate preheating temperature (200—400 ℃) on the apparent density and mechanical properties of fabricated 30%(mass fraction) SiC_p/AlSi10Mg (45 μm) parts with fixed and optimized process parameters was investigated at first. As the mass fraction of SiC_p was increased to 50%, the influence of the above mentioned substrate preheating temperature on the properties of fabricated composites was evaluated again. The results show that, when the mass fraction of SiC_p is 30%, an increased preheating temperature of a substrate can reduce the holes and cracks of a formed parts, the apparent densities and mechanical properties of the fabricated parts are significantly improved; when the substrate is preheated to 400 ℃, the maximum apparent densities of fabricated parts can reach 97.98%, while the ultimate compressive strength and ultimate tensile strength are 578 MPa and 56 MPa, respectively. The effect of substrate preheating on the densification and strengthening of mechanical properties of fabricated parts gradually decreases as the mass fraction of SiC_p was increased to 50%. This study proves that a high temperature preheating of the substrate is effective in suppressing metallurgical defects of medium volume fraction SiC_p/Al composites fabricated with selective laser mel-ting, providing an engineering solution for additive manufacturing of SiC_p/Al composites.

Key words： medium volume fraction SiC_p/Al composite selective laser melting preheated substrate density mechanical property

Published: 10 February 2024 Online: 2024-02-19

CLC number:

TG148

Fund:National Natural Science Foundation of China (51675507, 51901220), the Natural Science Foundation of Chongqing (cstc2020jcyj-msxmX0787, cstc2021jcyj-msxmX0435), Foundation of Binzhou Institute of Technology, and the Youth Innovation Promotion Association, CAS.

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	Articles by authors
	GUO Yaoqi
	TANG Min
	MA Honglin
	WEI Wenhou
	WANG Linzhi
	FAN Shuqian
	ZHANG Qi

Cite this article:

GUO Yaoqi,TANG Min,MA Honglin, et al. Effect of Preheating Temperature on Mechanical Properties of 30%SiC_p/AlSi10Mg Composites Fabricated by Selective Laser Melting[J]. Materials Reports, 2024, 38(3): 22090016-7.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.22090016 OR http://www.mater-rep.com/EN/Y2024/V38/I3/22090016

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