Fabricating 9–12 Cr ferritic/martensitic steels using selective electron beam melting

Lee, Tack; Bian, Huakang; Aoyagi, Kazuhiko; Ohnishi, Haruo; Hino, Takehisa; Nakatani, Yujiro; Chiba, Akihiko

doi:10.1016/j.matlet.2020.127747

Cited by 5 publications

(2 citation statements)

References 13 publications

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“…This process uses an electron beam source instead of a laser beam to melt the metallic powder and form a solid part. Common alloys produced via EBM are steels [15] and titanium alloys [16]. Although EBM can be beneficial due to minimal oxidation and precise control during manufacturing, the focus of the present work will be on LPBF, which is a cheaper and faster manufacturing technique.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution, Mechanical Properties and Deformation Behavior of an Additively Manufactured Maraging Steel

Chadha

Tian²,

Bocher

et al. 2020

Materials

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In this work, the microstructure and mechanical properties of an additively manufactured X3NiCoMoTi18-9-5 maraging steel were determined. Optical and electron microscopies revealed the formation of melt pool boundaries and epitaxial grain growth with cellular dendritic structures after the laser powder bed fusion (LPBF) process. The cooling rate is estimated to be around 106 °C/s during solidification, which eliminates the nucleation of any precipitates. However, it allows the formation of austenite with a volume fraction of about 5% and dendritic structures with primary arm spacing of 0.41 ± 0.23 µm. The electron backscatter diffraction analysis showed the formation of elongated grains with significant low-angle grain boundaries (LAGBs). Then, a solutionizing treatment was applied to the as-printed samples to dissolve all the secondary phases, followed by aging treatment. The reverted austenite was evident after heat treatment, which transformed into martensite after tensile testing. The critical plastic stresses for this transformation were determined using the double differentiation method. The tensile strength of the alloy increased from 1214 MPa to 2106 MPa after the aging process due to the formation of eta phase. The experimental data were complemented with thermodynamic and mechanical properties simulations, which showed a discrepancy of less than 3%.

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Section: Introductionmentioning

confidence: 99%

Microstructure Evolution, Mechanical Properties and Deformation Behavior of an Additively Manufactured Maraging Steel

Chadha

Tian²,

Bocher

et al. 2020

Materials

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show abstract

“…[48,49] The K-S orientation was also detected in low carbon ferritic-martensitic steel fabricated by AM method. [50] Accordingly, the f001g a pole figure taken from single parent austenite grain of the as-built sample (Figure 8) shows the traces of the K-S OR between the parent austenite and martensite laths. However, in addition to K-S orientation, traces of Nishiyama-Wassermann…”

Section: A Dilatometric Measurementsmentioning

confidence: 99%

Microstructural Evolution in Additively Manufactured Fe-Cr-Ni Maraging Stainless Steel

Shahriari

Sanjari

Pirgazi

et al. 2022

Metall Mater Trans A

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The microstructure and mechanical properties of selective electron beam melting manufactured 9–12Cr ferritic/martensitic steel using N- and Ar-atomized powder

Lee

Aoyagi

Bian

et al. 2021

Additive Manufacturing

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Fabricating 9–12 Cr ferritic/martensitic steels using selective electron beam melting

Cited by 5 publications

References 13 publications

Microstructure Evolution, Mechanical Properties and Deformation Behavior of an Additively Manufactured Maraging Steel

Microstructure Evolution, Mechanical Properties and Deformation Behavior of an Additively Manufactured Maraging Steel

Microstructural Evolution in Additively Manufactured Fe-Cr-Ni Maraging Stainless Steel

The microstructure and mechanical properties of selective electron beam melting manufactured 9–12Cr ferritic/martensitic steel using N- and Ar-atomized powder

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