选区激光熔化法制备NiCrFeAl合金的显微组织与缺陷

doi:10.19976/j.cnki.43-1448/TF.2022033

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Abstract NiCrFeAl alloy was prepared by selective laser melting (SLM) using NiCrFeAl prealloy powders as raw material. The optimizing of SLM processing parameters was carried out through optical analyzing on pores. Scanning electron microscope was ultilized for microstructure characterization of the alloy, and defects were analyzed by EBSD. The mechanical properties tests were carried out on UTM 5105 electronic universal testing machine. Results show that the optimal processing parameters of NiCrFeAl alloy fabrication are as follows: laser power of 240 W, scanning speed of 1 000 mm/s, hatching spacing of 0.12 mm and layer thickness of 0.03 mm. The corresponding tensile strength and elongation are 535 MPa and 5.8% respectively. There are solid cracks distributed between adjacent grains with large misorientation, showed intergranular fracture on horizontal and vertical cross sections. The average grain size on the horizontal cross section of the alloy is 35 μm, and the low angle grain boundaries accounts for 37.0%. The average grain size on the vertical section is 56 μm, and the low angle grain boundaries accounts for 41.0%.

Key words： additive manufacturing selective laser melting nickel-based alloys mechanical property microstructure

Received: 28 March 2022 Published: 27 January 2023

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TG146.1

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	Articles by authors
	XU Ruifeng
	GENG Zhaowen
	CHEN Chao
	ZHANG Jiaqi
	LI Dan
	NI Mang
	ZHOU Kechao

Cite this article:

XU Ruifeng,GENG Zhaowen,CHEN Chao, et al. Microstructure and defects of NiCrFeAl alloy by selective laser melting[J]. Materials Science and Engineering of Powder Metallurgy, 2022, 27(6): 586-594.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2022033 OR http://pmbjb.csu.edu.cn/EN/Y2022/V27/I6/586

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