Laser polishing of additive manufactured CoCr components for controlling their wettability characteristics

Yung, Kam Chuen; Wang, W.J.; Xiao, T.Y.; Choy, H. S.; Mo, Xiaoyong; Zhang, S.S.; Cai, Zhixiang

doi:10.1016/j.surfcoat.2018.07.030

Cited by 46 publications

(20 citation statements)

References 33 publications

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“…Recent studies have focused on surface modification using lasers to satisfy strict surface requirements in medical applications. The surface quality of additive manufactured parts can be significantly improve by laser polishing [ 76 , 77 ]. Additionally, some studies show that the surface microstructure and corrosion resistance was improved by controlling the hexagonal close packed structures and the formed oxides [ 78 ].…”

Section: Post-processing Strategiesmentioning

confidence: 99%

Challenges of Co–Cr Alloy Additive Manufacturing Methods in Dentistry—The Current State of Knowledge (Systematic Review)

et al. 2020

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Complex dental components which are individually tailored to the patient can be obtained due to new additive manufacturing technology. This paper reviews the metallic powders used in dental applications, the fabrication process (build orientation, process parameters) and post-processing processes (stress relieving, surface finishing). A review of the literature was performed using PubMed, ScienceDirect, Mendeley and Google Scholar. Over eighty articles were selected based on relevance to this review. This paper attempts to include the latest research from 2010 until 2020, however, older manuscripts (10 articles) were also selected. Over 1200 records were identified through the search; these were screened for title and/or summary. Over eighty articles were selected based on relevance to this review. In order to obtain a product which can be used in clinical applications, the appropriate manufacturing parameters should be selected. A discussion was made on optimal selective laser melting (SLM) parameters in dentistry. In addition, this paper includes a critical review of applied thermal treatment methods for Co–Cr alloys used in dentistry.

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Section: Post-processing Strategiesmentioning

confidence: 99%

Challenges of Co–Cr Alloy Additive Manufacturing Methods in Dentistry—The Current State of Knowledge (Systematic Review)

et al. 2020

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“…Using ablation mode, material evaporates, sublimates, or is converted to plasma; defected layer could be removed from the surface of AM-manufactured part in such a way. According to results published by other researches [5][6][7][8], laser processing of AM products diminishes significantly their roughness, increases microhardness and wear resistance, seals porosity, refines microstructure, and improves micromachinability. e above named effects were obtained on AM parts produced out of various alloys such as Fe-Co, CoCr, Ti-6Al-4V, TiC11, Inconel 718, bronze, and AISI 420 stainless steel.…”

Section: Introductionmentioning

confidence: 95%

Surface Laser Processing of Additive Manufactured 1.2709 Steel Parts: Preliminary Study

Černašėjus

Škamat

Markovič

et al. 2019

Advances in Materials Science and Engineering

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Recently, metal selective laser sintering (SLS) techniques have attracted lively interest as a promising technology, which offers a number of unique applications in manufacturing of metal parts with complex internal structure and geometry. However, unsatisfactory surface properties of as-manufactured SLS parts cause high cost of finish processing and restrict wider application of SLS products. The paper presents results of the study, which was taken to evaluate capability of laser processing to improve surface quality of SLS parts manufactured from powder maraging steel 1.2709 (X3NiCoMoTi 18-9-5). The properties of processed surfaces were assessed, and the main dependencies of the roughness, hardness, wear resistance, and phase composition on the main parameters of laser processing—scanning speed, laser power, and number of processing times—were determined. The roughness of surfaces was diminished up to ∼41%, the hardness was increased up to ∼88%, and the wear resistance was improved up to almost 4 times, as compared with surface of as-manufactured SLS part. The preliminary study has demonstrated that laser processing has considerable potential for improvement of surface conditions of steel additive manufactured parts.

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“…The laser polished layer consisted of equiaxed grain and columnar grain in microstructure. The laser polishing was also employed to control the surface wettability of AM CoCr component [ 20 ]. The experimental study has attracted more attention than the numerical study in recent years.…”

Section: Introductionmentioning

confidence: 99%

In-Situ Laser Polishing Additive Manufactured AlSi10Mg: Effect of Laser Polishing Strategy on Surface Morphology, Roughness and Microhardness

Zhou

Han

et al. 2021

Materials

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Laser polishing is a widely used technology to improve the surface quality of the products. However, the investigation on the physical mechanism is still lacking. In this paper, the established numerical transient model reveals the rough surface evolution mechanism during laser polishing. Mass transfer driven by Marangoni force, surface tension and gravity appears in the laser-induced molten pool so that the polished surface topography tends to be smoother. The AlSi10Mg samples fabricated by laser-based powder bed fusion were polished at different laser hatching spaces, passes and directions to gain insight into the variation of the surface morphologies, roughness and microhardness in this paper. The experimental results show that after laser polishing, the surface roughness of Ra and Sa of the upper surface can be reduced from 12.5 μm to 3.7 μm and from to 29.3 μm to 8.4 μm, respectively, due to sufficient wetting in the molten pool. The microhardness of the upper surface can be elevated from 112.3 HV to 176.9 HV under the combined influence of the grain refinement, elements distribution change and surface defects elimination. Better surface quality can be gained by decreasing the hatching space, increasing polishing pass or choosing apposite laser direction.

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Laser polishing of additive manufactured CoCr components for controlling their wettability characteristics

Cited by 46 publications

References 33 publications

Challenges of Co–Cr Alloy Additive Manufacturing Methods in Dentistry—The Current State of Knowledge (Systematic Review)

Challenges of Co–Cr Alloy Additive Manufacturing Methods in Dentistry—The Current State of Knowledge (Systematic Review)

Surface Laser Processing of Additive Manufactured 1.2709 Steel Parts: Preliminary Study

In-Situ Laser Polishing Additive Manufactured AlSi10Mg: Effect of Laser Polishing Strategy on Surface Morphology, Roughness and Microhardness

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