High mechanical strengths and ductility of stainless steel 304L fabricated using selective laser melting

Q. B. Nguyen, Z. Zhu, F. L. Ng, B. W. Chua, S. M.L. Nai, J. Wei

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Achieving not only high mechanical strengths but also high ductility is recently established using an additive manufacturing technique called selective laser melting. In the present study, stainless steel 304L fully dense samples were successfully printed using the 3D systems – ProX 300 printing machine. The ductility and tensile yield strength were almost two and three times higher compared to those of ASTM cast's alloy. Honey comb like nano-cellular structure with different orientation was observed in the fine grains (∼4 μm) due to fast cooling rate. In addition, the formation of martensite phase in random grains is also a contributor to the strengths. Furthermore, negative residual stresses in the build and horizontal directions were detected and assisted further increase in the tensile strength. Fractography revealed the ductile feature of plastic deformation and the crack openings at unmelted particles or pores.

Original languageEnglish
Pages (from-to)388-394
Number of pages7
JournalJournal of Materials Science and Technology
Volume35
Issue number2
DOIs
Publication statusPublished - 1 Feb 2019
Externally publishedYes

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Stainless Steel
Strength of materials
Ductility
Melting
3D printers
Stainless steel
Fractography
Naproxen
Lasers
Martensite
Yield stress
Printing
Residual stresses
Plastic deformation
Tensile strength
Cooling
Cracks
Direction compound

Cite this

Nguyen, Q. B. ; Zhu, Z. ; Ng, F. L. ; Chua, B. W. ; Nai, S. M.L. ; Wei, J. / High mechanical strengths and ductility of stainless steel 304L fabricated using selective laser melting. In: Journal of Materials Science and Technology. 2019 ; Vol. 35, No. 2. pp. 388-394.
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High mechanical strengths and ductility of stainless steel 304L fabricated using selective laser melting. / Nguyen, Q. B.; Zhu, Z.; Ng, F. L.; Chua, B. W.; Nai, S. M.L.; Wei, J.

In: Journal of Materials Science and Technology, Vol. 35, No. 2, 01.02.2019, p. 388-394.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Nguyen, Q. B.

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AB - Achieving not only high mechanical strengths but also high ductility is recently established using an additive manufacturing technique called selective laser melting. In the present study, stainless steel 304L fully dense samples were successfully printed using the 3D systems – ProX 300 printing machine. The ductility and tensile yield strength were almost two and three times higher compared to those of ASTM cast's alloy. Honey comb like nano-cellular structure with different orientation was observed in the fine grains (∼4 μm) due to fast cooling rate. In addition, the formation of martensite phase in random grains is also a contributor to the strengths. Furthermore, negative residual stresses in the build and horizontal directions were detected and assisted further increase in the tensile strength. Fractography revealed the ductile feature of plastic deformation and the crack openings at unmelted particles or pores.

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