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Microstructure and Size‑Dependent Mechanical Properties of Additively Manufactured 316L Stainless Steels Produced by Laser Metal Deposition

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Acta Metallurgica Sinica(English Letters) 2023年第1期36卷 1-20页

作者： Hua‑Zhen Jiang Qi‑Sheng Chen Zheng‑Yang Li Xin‑Ye Chen Hui‑Lei Sun Shao‑Ke Yao Jia‑Huiyu Fang Qi‑Yun Hu Institute of Mechanics Chinese Academy of SciencesBeijing 100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 100190China DE.Testing(JIANGSU)Co. LTDChangzhou 213164China

Metal additive manufacturing(AM),as a disruptive technology in the feld of fabricating metallic parts,has shown its ability to design component with macrostructural ***,some of these functionally complex structures typically contain a wide range of feature sizes,namely,the characteristic length of elements in AM-produced components can vary from millimeter to *** requisite for controlling performance covers nearly six orders of magnitude,from the microstructure to macro scale *** the mechanical variation with the feature size is of critical importance for topology optimization engineers to make required design *** this work,laser metal deposition(LMD)is adopted to manufacture 316L stainless steel(SS)*** evaluate the efect of defects and specimen size on mechanical properties of LMD-produced samples,fve rectangular sample sizes which ranged from non-standard miniature size to ASTM standard sub-sized samples were machined from the *** test reveals that the mechanical properties including yield strength(YS),ultimate tensile strength(UTS),and elongation to failure(εf)are almost the identical for samples with ASTM standard ***,relatively lower YS and UTS values,except forεf,are observed for samples with a miniature size compared with that of ASTM standard ***εf values of LMD-produced 316L SS samples show a more complex trend with sample size,and are afected by three key infuencing factors,namely,slimness ratio,cluster of pores,and occupancy location of lack of fusion *** general,theεf values exhibit a decreasing trend with the increase of slimness *** characterization reveals that the LMD-produced 316L samples exhibited a high stress status at low angle grain boundaries,whilst its location changed to high angle grain boundaries after plastic *** grain size refnement and austenite-to-martensite phase transformation occurred during plastic deformatio

关键词： Additive manufacturing Laser metal deposition 316L stainless steel Tensile properties slimness ratio

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