Effect of Building Dimensions by Selective Laser Melting on Pitting Properties of 304L Stainless Steel

doi:10.11901/1005.3093.2021.625

Chinese Journal of Materials Research

2023, Vol. 37

Issue (5): 353-361 DOI: 10.11901/1005.3093.2021.625

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Effect of Building Dimensions by Selective Laser Melting on Pitting Properties of 304L Stainless Steel

JIANG Menglei¹, DAI Binbin¹, CHEN Liang², LIU Hui¹, MIN Shiling¹, YANG Fan¹, HOU Juan¹^,²(

)

^1.School of Materials and Chemistry, University of Shanghai Science and Technology, Shanghai 200093, China
^2.State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment, China Nuclear Power Engineering Co., Ltd., Shenzhen 518172, China

Cite this article:

JIANG Menglei, DAI Binbin, CHEN Liang, LIU Hui, MIN Shiling, YANG Fan, HOU Juan. Effect of Building Dimensions by Selective Laser Melting on Pitting Properties of 304L Stainless Steel. Chinese Journal of Materials Research, 2023, 37(5): 353-361.

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Abstract

The impact of building dimensions on the corrosion performance of the selective laser melting (SLMed) 304L stainless steel with different thickness and width was investigated by changing the scanning track (T) and depositing layers (L). The results show that the coarsening of grain size and the accumulation of the residual stress, as well as the number of pits and the pitting area all increased with the increasing of sample size. Accordingly, the preliminary relationship between dimension design, microstructure morphology, corrosion performance and residual stress were established.

Key words: metallic materials selective laser melting 304L stainless steel size effect corrosion performance NETFABB simulation

Received: 12 November 2021

ZTFLH:

TG178

Fund: Shenzhen International Cooperation Research Science and Technology Program(GJHZ20200731095203011);State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment Opening Project(CSO-102-001);Natural Science Foundation of China(52073176);Natural Science Foundation of China(U22B2067)

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	JIANG Menglei
	DAI Binbin
	CHEN Liang
	LIU Hui
	MIN Shiling
	YANG Fan
	HOU Juan

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https://www.cjmr.org/EN/10.11901/1005.3093.2021.625 OR https://www.cjmr.org/EN/Y2023/V37/I5/353

Table 1 Chemical composition of 304L stainless steel powder and SLMed-304L stainless steel (%, mass fraction)

Fig.1 Different building dimensions by changing the tracks (T) and layers (L)

Table 2 Abbreviations of different dimensional samples

Fig.2 Optical metallurgic morphology of fish-scale microstructure in vertical planes along with building direction (a) and microstructure in horizontal plane (b)

Fig.3 Metallurgical morphologies of the cellular sub-grains observed through SEM (a) and TEM (b)

Fig.4 Metallurgical images on building direction of SLM 304L stainless steel low tracks samples with different layers (a) T20-L100, (b) T20-L500, (c) T20-L700, (d) T20-L1000

Fig.5 Metallurgical images of SLM 304L stainless steel samples with different T×L sizes of T100-L100 (a), T200-L100 (b), T300-L100 (c), T300-L500 (d), T300-L700 (e) and T300-L1000 (f)

Fig.6 Grains distribution mappings in zones with increasing distance fin substrate along build direction in T20-L1000 samples (a) Z1 zone, (b) Z2 zone, (c) Z3 zone and (d) Z4 zone

Fig.7 Hardness measurement results of L100 components (a) and T20 and T300 components (b)

Fig.8 Pitting micrographs of samples with different size (a) T20-L100, (b) T20-L500, (c) T20-L700, (d) T20-L1000, (e) T100-L100, (f) T200-L100, (g) T300-L100, (h) T300-L100, (i) T300-L500, (j) T300-L700 and (k) T300-L1000

Fig.9 Pitting average size and area ratio of samples with different size (a) low track (T=20) samples with settled tracks and increased layers: T20-L100, T20-L500, T20-L700, T20-L1000, (b) high track (T=300) samples with settled tracks and increased layers: T300-L100, T300-L500, T300-L700, T300-L1000, and (c) settled layer (L100) with increasing tracks of L100-T20, L100-T100, L100-T200 and L100-T300

Fig.10 Simulation result of NetFabb (a)T20-L10, (b) T100-L100, (c) T200-L100 and (d) T300-L100

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