Plastic Deformation Behavior of Selective Laser Melting 316L Stainless Steel under High Strain Rate Compression

doi:10.11901/1005.3093.2022.448

Chinese Journal of Materials Research

2023, Vol. 37

Issue (5): 391-400 DOI: 10.11901/1005.3093.2022.448

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Plastic Deformation Behavior of Selective Laser Melting 316L Stainless Steel under High Strain Rate Compression

LIU Tao¹^,²^,³(

), YIN Zhiqiang¹, LEI Jingfa¹^,², GE Yongsheng¹, SUN Hong¹^,²

^1.School of Mechanical and Electrical Engineering, Anhui Jianzhu University, Hefei 230601, China
^2.Anhui Provincial Key Laboratory of Intelligent Manufacturing of Construction Machinery, Hefei 230601, China
^3.Anhui Province Key Laboratory of Human Safety, Hefei 230601, China

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LIU Tao, YIN Zhiqiang, LEI Jingfa, GE Yongsheng, SUN Hong. Plastic Deformation Behavior of Selective Laser Melting 316L Stainless Steel under High Strain Rate Compression. Chinese Journal of Materials Research, 2023, 37(5): 391-400.

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Abstract

The selective laser melting 316L stainless steel (SLM-316L) was prepared with preferred process parameters, and then the effect of high strain rate compression on the plastic deformation behavior of SLM 316L stainless steel by high strain rates (1000, 2000 and 3000 s^-1) was assessed by means of split Hopkinson pressure bar, scanning electron microscope and backscattered electron diffractometer in terms of the microstructure and microscopic deformation such as dislocation slip and twinning etc. Results show that SLM-316L stainless steel exhibits a significant strain rate strengthening effect by high strain-rate loading, and its microstructure is composed of closely packed columnar grains with irregular polygonal cross section. High strain rate loading decreases the degree of preferred orientation of grains and increases the number of small-angle grain boundaries and twin boundaries, and the twin boundaries are densely emerge in the cross-twisting region of small-angle grain boundaries. The plastic deformation process of the SLM-316L stainless steel is accompanied by dislocation slip and twinning behavior.

Key words: metallic materials plastic deformation high strain rate compression 316L stainless steel selective laser melting

Received: 18 August 2022

ZTFLH:

TG142.1

Fund: National Natural Science Foundation of China(51805003);Anhui Education Department Excellent Young Talent Support Project(gxyqZD2019057);the Foundation of Anhui Province Key Laboratory of Human Safety(DEPS-2021-02)

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	LIU Tao
	YIN Zhiqiang
	LEI Jingfa
	GE Yongsheng
	SUN Hong

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https://www.cjmr.org/EN/10.11901/1005.3093.2022.448 OR https://www.cjmr.org/EN/Y2023/V37/I5/391

Fig.1 Micro morphology (a) and particle size distribu-tion of powder (b)

Table 1 Element composition of the powder

Fig.2 Working principle of SLM forming equipment

Fig.3 Schematic diagram of SHPB device

Fig.4 Original waveform of dynamic compression experiment

Fig.5 Stress balance curves

Fig.6 Microstructure characterization specimens (a) SLM molding specimen, (b) cuboid specimen

Fig.7 Dynamic compressive stress-strain curves (a) stress-strain curves (1000, 2000 and 3000 s^-1), (b) analysis of curves

Fig.8 Micromorphology of specimen before high strain rate loading (a) laser scanning plane, (b) construction section, (c) enlarged image of zone I, (d) enlarged image of zone II, (e) enlarged image of zone III

Fig.9 Schematic diagram of columnar cell crystal and close-packed structure (a) columnar cell crystal structure， (b) close-packed structure

Fig.10 Micromorphology of specimen after high strain rate loading (a) laser scanning plane, (b) construction section

Fig.11 Crystal morphology and orientation analysis (a) crystal orientation figure of the initial specimen, (b) crystal orientation figure of the deformed specimen, (c) pole figure and inverse pole figure of the initial specimen, (d) pole figure and inverse pole figure of the deformed specimen

Fig.12 Statistics of grain size (a) the initial specimen, (b) the deformed specimen

Fig.13 Distribution of large and small angle grain boundaries (a) grain boundary figure of the initial specimen, (b) grain boundary figure of the deformed specimen, (c) grain boundary statistical diagram of the initial specimen, (d) grain boundary statistical diagram of the deformed specimen

Fig.14 Distribution of twin boundaries (a) the initial specimen, (b) the deformed specimen

Fig.15 KAM figures and dislocation density statistical diagrams of specimens (a) KAM figure of the initial specimen, (b) KAM figure of the deformed specimen, (c) dislocation density statistical diagram of the initial specimen, (d)dislocation density statistical diagram of the deformed specimen

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