Metallurgical Characteristics of Laser Peened 17-4 PH SS Processed by LENS Technique

Mathoho, Ipfi; Akinlabi, Esther T.; Arthur, Nana Kk; Tlotleng, Monnamme; Masina, Bathusile N

doi:10.1007/978-3-030-05861-6_25

Cited by 7 publications

(4 citation statements)

References 9 publications

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“…Also in this study, solutionizing and ageing leads to a microstructure comparable with wrought material and satisfactory mechanical properties [86]. 17-4 PH steel has been successfully produced by DED, but reports in the literature are very scarce until now [103,104].…”

Section: Ph Stainless Steels: Other Am Processesmentioning

confidence: 80%

Steels in additive manufacturing: A review of their microstructure and properties

Bajaj

Hariharan

Kini

et al. 2020

Materials Science and Engineering: A

640

265

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Section: Ph Stainless Steels: Other Am Processesmentioning

confidence: 80%

Steels in additive manufacturing: A review of their microstructure and properties

Bajaj

Hariharan

Kini

et al. 2020

Materials Science and Engineering: A

640

265

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“…Mathoho et al [39] conducted roughness analysis for 17-4PH steel produced by laser engineered net shaping (LENS) technique. After laser peening, the roughness decreased after 3 and 6 passes by 28% and 42%, respectively.…”

Section: Roughnessmentioning

confidence: 99%

Effect of shot peening on corrosion resistance of additive manufactured 17-4PH steel

Świetlicki

Walczak

Szala

2022

Materials Science-Poland

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Components produced by additive manufacturing (AM) via direct metal laser sintering (DMLS) have typical as-fabricated surface defects. As a result, surface properties of AM products should be modified to increase their strength, anti-wear behavior, and at the same time ensure their high corrosion resistance. Surface modification via shot peening (SP) is considered suitable for AM of engineering devices made of 17-4PH (X5CrNiCuNb16-4) stainless steel. The objective of this study was to determine the effect of three types of peening media (CrNi steel shot, glass, and ceramic beads) on the corrosion resistance of specimens of DMLS 17-4PH stainless steel. Results demonstrated that SP caused steel microstructure refinement and induced both martensite (α) formation and retained austenite (γ) reduction. 17-4PH specimens peened showed the increase in surface hardness of 255, 281, and 260 HV0.2 for ceramic, glass, and steel, respectively. DMLS 17-4PH specimens modified by SP exhibited different surface morphology, hardness, and microstructure and thus, these properties affect corrosion performance. The results implied that steel shot peened with steel shot showed the highest resistance to corrosion processes (Icorr = 0.019 μA/cm2), slightly worse with glass (Icorr = 0.227 μA/cm2) and ceramics (Icorr = 0.660 μA/cm2) peened. In the case of ceramic and glass beads, it was possible to confirm the presence of the above-mentioned particles in the surface layer after SP.

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“…Another common steel grade in AM is 17-4 PH martensitic stainless steel. However, the majority of the work has been on powder bed methods [222][223][224][225][226][227], as opposed to DED [51,91,108,172,228,229]. High cooling rates associated with the selected AM processes limit transformation of δ-ferrite to γaustenite at high temperatures so that some amounts of δ-ferrite remain at room temperature.…”

Section: Steelsmentioning

confidence: 99%

Large-scale metal additive manufacturing: a holistic review of the state of the art and challenges

Lehmann

Rose

Ranjbar

et al. 2021

International Materials Reviews

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Additive Manufacturing (AM) has the potential to completely reshape the manufacturing space by removing the geometrical constraints of commercial manufacturing and reducing component lead time, especially for large-scale parts. Coupling robotic systems with direct energy deposition (DED) additive manufacturing techniques allow for support-free printing of parts where part sizes are scalable from sub-metre to multi-metre sizes. This paper offers a holistic review of large-scale robotic additive manufacturing, beginning with an introduction to AM, followed by different DED techniques, the compatible materials and their typical as-built microstructures. Next, the multitude of robotic build platforms that extend the deposition from the standard 2.5 degrees of freedom (DOF) to 6 and 8 DOF is discussed. With this context, the decomposition and slicing of the computerized model will be described, and the challenges of planning the deposition trajectory will be discussed. The different modalities to monitor and control the deposition in an attempt to meet the geometrical and performance specifications are outlined and discussed. A wide range of metals and alloys have been reported and evaluated for large-scale AM parts. These include steels, Ti, Al, Mg, Cu, Ni, Co-Cr and W alloys. Different post-processing steps, including heat treatments, are discussed, along with their microstructures. This paper finally addresses the authors' perspective on the future of the field and the largest knowledge gaps that need to be filled before the commercial implementation of robotic AM.

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Metallurgical Characteristics of Laser Peened 17-4 PH SS Processed by LENS Technique

Cited by 7 publications

References 9 publications

Steels in additive manufacturing: A review of their microstructure and properties

Steels in additive manufacturing: A review of their microstructure and properties

Effect of shot peening on corrosion resistance of additive manufactured 17-4PH steel

Large-scale metal additive manufacturing: a holistic review of the state of the art and challenges

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