Effect of heat treatment on the anisotropic microstructural and mechanical properties of Co–Cr–Mo alloys produced by selective laser melting

Takaichi, Atsushi; Kajima, Yuka; Kittikundecha, Nuttaphon; Htat, Hein Linn; Cho, Hla Htoot Wai; Hanawa, Takao; Yoneyama, Takayuki; Wakabayashi, Noriyuki

doi:10.1016/j.jmbbm.2019.103496

Cited by 60 publications

(22 citation statements)

References 39 publications

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confidence: 63%

“…The high intensity of the peak at 2θ = 59.8 • corresponding to γ(200) describes a {200} texture in the 3D-printed sample. The preferential growth of grains in the <100> crystallographic orientation parallel with the building direction was reported by several works [19,45,46] The XRD analysis determined the presence of two types of carbides: M23C6 (5.0 M6C (1.3%). However, as visible from the micrographs (Figure 4b-d), carbides o three different morphologies:…”

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confidence: 70%

“…Xin et al [17] found out that SLM-fabricated CCM alloy shows better biocompatibility than the cast counterpart, thus being a suitable option for biomedical applications. Some authors studied the effect of heat treatment [14,18,19].…”

Section: Introductionmentioning

confidence: 99%

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Different Response of Cast and 3D-Printed Co-Cr-Mo Alloy to Heat Treatment: A Thorough Microstructure Characterization

Roudnická

Bigas

Molnárová

et al. 2021

Metals

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The Co-Cr-Mo alloy is a biomaterial with very good corrosion resistance and wear resistance; thus, it is widely applied for knee replacements. The wear resistance is influenced by the amount of hcp phase and morphology of carbidic precipitates, which can both be altered by heat treatment. This study compares a conventional knee replacement manufactured by investment casting with a material prepared by the progressive technology of 3D printing. The first set of results shows a different response of both materials in increasing hardness with annealing at increasing temperatures up to the transformation temperature. Based on these results, solution treatment and subsequent aging at conditions to reach the maximum hardness was applied. Microstructural changes were studied thoroughly by means of optical, scanning electron and transmission electron microscopy. While increased hardness in the conventional material is caused by the precipitation of fine hard carbides combined with an increase in the hcp phase by isothermal transformation, a massive fcc → hcp transformation is the main cause for the hardness increase in the 3D-printed material.

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Different Response of Cast and 3D-Printed Co-Cr-Mo Alloy to Heat Treatment: A Thorough Microstructure Characterization

Roudnická

Bigas

Molnárová

et al. 2021

Metals

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“…It was shown that the heat treatment up to 1050 °C for six hours was insufficient to eliminate anisotropy and residual stress. However, the dendritic structures and number of sub-grains decreased while increasing the heat-treatment temperature (from 750 °C to 1050 °C) compared with the as-built samples [ 60 ]. During the recovery process, the deformed grains reduced their stored energy through the removal or rearrangement of defects in their crystal structure [ 64 ].…”

Section: Post-processing Strategiesmentioning

confidence: 99%

“…Heat furnace from room temperature to 750, 900, 1050, or 1150 • C (a ramp rate of 60 • C/min) and hold at the specified temperature for six hours. [ 60,61] The three heat treatment cycles were used: I. One hour at 1220 • C; II.…”

Section: Stress Relievingmentioning

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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Characterization of the Anisotropy in the Microstructure and Mechanical Properties of Laser Powder Bed Fusion Ti₆Al₄V Alloys

Huang

Wang

et al. 2022

Adv Eng Mater

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Herein, near‐full‐density Ti6Al4V components are prepared by laser powder bed fusion (LPBF). The microstructural evolution and mechanical properties in different deposition planes are investigated to explore their anisotropic behavior. The internal defects of the LPBF‐fabricated Ti6Al4V components mainly included round‐like pores, primarily caused by metal vapor and entrapped gas during solidification. The microstructure of the horizontal plane consists of a large amount of α′/α martensite within a near‐equiaxed β matrix. In addition to similar acicular martensites, the columnar β grains within the vertical plane are induced by the steep thermal gradient along the deposition direction. Compared to that in the vertical plane, the microhardness in the horizontal plane is improved mainly due to the grain boundary strengthening mechanism. The transverse tensile strength and elongation are superior to the longitudinal ones, and the failure mode is transformed from ductile to brittle. Such anisotropic behavior in the tensile properties is primarily attributed to the varied microstructural evolution in the different deposition planes. This work demonstrates that LPBF‐fabricated Ti6Al4V alloys contain acicular α′/α martensites, which consequently enhance the strength/hardness properties, despite the anisotropic performances caused by the columnar β grains.

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Effect of heat treatment on the anisotropic microstructural and mechanical properties of Co–Cr–Mo alloys produced by selective laser melting

Cited by 60 publications

References 39 publications

Different Response of Cast and 3D-Printed Co-Cr-Mo Alloy to Heat Treatment: A Thorough Microstructure Characterization

Different Response of Cast and 3D-Printed Co-Cr-Mo Alloy to Heat Treatment: A Thorough Microstructure Characterization

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

Characterization of the Anisotropy in the Microstructure and Mechanical Properties of Laser Powder Bed Fusion Ti₆Al₄V Alloys

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Effect of heat treatment on the anisotropic microstructural and mechanical properties of Co–Cr–Mo alloys produced by selective laser melting

Cited by 60 publications

References 39 publications

Different Response of Cast and 3D-Printed Co-Cr-Mo Alloy to Heat Treatment: A Thorough Microstructure Characterization

Different Response of Cast and 3D-Printed Co-Cr-Mo Alloy to Heat Treatment: A Thorough Microstructure Characterization

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

Characterization of the Anisotropy in the Microstructure and Mechanical Properties of Laser Powder Bed Fusion Ti6Al4V Alloys

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Product

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Characterization of the Anisotropy in the Microstructure and Mechanical Properties of Laser Powder Bed Fusion Ti₆Al₄V Alloys