Preparation of 316L Stainless Steel Products by Fused Deposition Model 3D-printing and Effect of La on Morphology and Distribution of Precipitates

doi:10.11901/1005.3093.2019.591

Chinese Journal of Materials Research

2020, Vol. 34

Issue (8): 635-640 DOI: 10.11901/1005.3093.2019.591

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Preparation of 316L Stainless Steel Products by Fused Deposition Model 3D-printing and Effect of La on Morphology and Distribution of Precipitates

CAI Guodong, CHENG Xiyun(

), WANG Dian

Department of Mechanical and Electrical Engineering, Shantou University, Shantou 515000, China

Cite this article:

CAI Guodong, CHENG Xiyun, WANG Dian. Preparation of 316L Stainless Steel Products by Fused Deposition Model 3D-printing and Effect of La on Morphology and Distribution of Precipitates. Chinese Journal of Materials Research, 2020, 34(8): 635-640.

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Abstract

The hot melt feedstock was prepared with micron 316L stainless steel powder and wax based binder. The green body was formed by 3D printing, and the final product was formed by degreasing and sintering. Through the performance characterization and test of the final product, the feasibility of this forming method has been verified. Aiming at relieving the irregular morphology of precipitates and the emerge of inclusions on grain boundaries of the prepared products, the influence of rare earth La on the deposition has been explored. Based on the microporous structure formed by degreasing of the green body, a method of adding La via liquid phase has been proposed. The results show that 316L stainless steel products can be prepared by FDM type 3D printing, trace rare earth La can be added to the green body via liquid phase addition method, and the mass ratio of 0.3% LaCl₃ can significantly improve the microstructure and distribution characteristics of final products after sintering.

Key words: synthesizing and processing technics fdm metal 3D printing microporous structure liquid phase addition rare earth elements precipitates

Received: 19 December 2019

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	Guodong CAI
	Xiyun CHENG
	Dian WANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.591 OR https://www.cjmr.org/EN/Y2020/V34/I8/635

Fig.1 Schematic diagram of feed pipe

Table 1 Heating block distribution

Fig.2 Sintering temperature rise curve

Fig.3 Green sample and section morphology (a) green sample, (b) section of sample

Fig.4 SEM of sample before and after degreasing (a) sample before degreasing, (b) sample after de greasing for 5 hours

Fig.5 Macroscopic morphology of samples before and after sintering (a) sample after degreasing, (b) sample after sintering, (c) cross section of sam ple after sintering

Table 2 Comparison of forming parameters

Fig.6 Microstructure of stainless steel

Fig.7 EDS analysis of deposition

Fig.8 SEM of samples before and after rare earth addition (LaCl₃ crystal in white dotted frame) (a): LaCl₃ 0%, (b) (c): LaCl₃ 0.3%

Fig.9 Morphology and distribution of deposition in sintered samples before and after rare earth addition (White arrows are deposition) (a) (b): LaCl₃ 0%, (c), (d) LaCl₃ 0.3%

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