scholarly journals Biodegradation, Antibacterial Performance, and Cytocompatibility of a Novel ZK30-Cu-Mn Biomedical Alloy Produced by Selective Laser Melting

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Bin Xie ◽  
Ming-Chun Zhao ◽  
Rong Xu ◽  
Ying-Chao Zhao ◽  
Deng-Feng Yin ◽  
...  
Keyword(s):  
Grain Size ◽  
Oxide Layer ◽  
Selective Laser Melting ◽  
Significant Influence ◽  
Surface Oxide Layer ◽  
Biodegradation Rate ◽  
Laser Melting ◽  
Antibacterial Performance ◽  
Biomedical Alloy ◽  
Mg Content

An antibacterial biomedical Mg alloy was designed to have a low biodegradation rate. ZK30-0.2Cu-xMn (x = 0, 0.4, 0.8, 1.2, and 1.6 wt.%) was produced by selective laser melting (SLM). Alloying with Mn had a significant influence on the grain size, hardness, and biodegradation rate. Increasing Mg content to 0.8 wt% decreased the biodegradation rate, attributed to the decreased grain size and the relatively protective manganese surface oxide layer. Higher Mn contents increased the biodegradation rate attributed to the presence of the Mn-rich particles. ZK30-0.2Cu-0.8Mn exhibited the lowest biodegradation rate, strong antibacterial performance and good cytocompatibility.

scholarly journals Effect of Alloying Mn by Selective Laser Melting on the Microstructure and Biodegradation Properties of Pure Mg

Metals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1527
Author(s):  
Bin Xie ◽  
Ming-Chun Zhao ◽  
Ying-Chao Zhao ◽  
Yan Tian ◽  
Dengfeng Yin ◽  
...  
Keyword(s):  
Manganese Oxide ◽  
Selective Laser Melting ◽  
Immersion Test ◽  
Biodegradation Rate ◽  
Laser Melting ◽  
Xps Spectra ◽  
Average Grain Size ◽  
Mn Content ◽  
Surface Morphologies ◽  
Effect Of Alloying

This work studied the effect of alloying Mn by selective laser melting on the microstructure and biodegradation properties of pure Mg. The grains in the microstructure were quasi-polygon in shape. The average grain size was similar (~10 μm) for the SLMed Mg-xMn with different Mn contents. The XPS spectra of the corrosion surface showed that alloying Mn into Mg by SLM produced a relatively protective manganese oxide film, which contributed to decreasing the biodegradation rate. All the results of the electrochemistry test, immersion test and the corrosion surface morphologies coincided well. The SLMed Mg-0.8Mn had the lowest biodegradation rate. When Mn content was more than 0.8 wt.%, the influence of the undissolved Mn phase on the decrease of the biodegradation resistance counteracted the influence of the relatively protective manganese oxide layer on the increase of the biodegradation resistance.

scholarly journals Graphene Oxide Reinforced Iron Matrix Composite With Enhanced Biodegradation Rate Prepared by Selective Laser Melting

2019 ◽  
Vol 21 (8) ◽  
pp. 1900314 ◽  
Author(s):  
Ying‐Chao Zhao ◽  
Yue Tang ◽  
Ming‐Chun Zhao ◽  
Long Liu ◽  
Chengde Gao ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Selective Laser Melting ◽  
Matrix Composite ◽  
Biodegradation Rate ◽  
Laser Melting ◽  
Iron Matrix ◽  
Enhanced Biodegradation

scholarly journals Selective Laser Melting of Aluminum and Its Alloys

Materials ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 4564 ◽  
Author(s):  
Zhi Wang ◽  
Raghunandan Ummethala ◽  
Neera Singh ◽  
Shengyang Tang ◽  
Challapalli Suryanarayana ◽  
...  
Keyword(s):  
Selective Laser Melting ◽  
Processing Parameters ◽  
Fatigue Properties ◽  
Internal Stresses ◽  
Surface Oxide Layer ◽  
Alloy Development ◽  
Laser Melting ◽  
Powder Bed ◽  
Microstructure Evaluation ◽  
Melt Cooling

The laser-based powder bed fusion (LBPF) process or commonly known as selective laser melting (SLM) has made significant progress since its inception. Initially, conventional materials like 316L, Ti6Al4V, and IN-718 were fabricated using the SLM process. However, it was inevitable to explore the possible fabrication of the second most popular structural material after Fe-based alloys/steel, the Al-based alloys by SLM. Al-based alloys exhibit some inherent difficulties due to the following factors: the presence of surface oxide layer, solidification cracking during melt cooling, high reflectivity from the surface, high thermal conductivity of the metal, poor flowability of the powder, low melting temperature, etc. Researchers have overcome these difficulties to successfully fabricate the different Al-based alloys by SLM. However, there exists no review dealing with the fabrication of different Al-based alloys by SLM, their fabrication issues, microstructure, and their correlation with properties in detail. Hence, the present review attempts to introduce the SLM process followed by a detailed discussion about the processing parameters that form the core of the alloy development process. This is followed by the current research status on the processing of Al-based alloys and microstructure evaluation (including defects, internal stresses, etc.), which are dealt with on the basis of individual Al-based series. The mechanical properties of these alloys are discussed in detail followed by the other important properties like tribological properties, fatigue properties, etc. Lastly, an outlook is given at the end of this review.

Effect of energy on Ti plate fabrication by vacuum selective laser melting for uniformity of grain size

2021 ◽  
Vol 33 (4) ◽  
pp. 042027
Author(s):  
Yuta Mizuguchi ◽  
Tsuneyoshi Arimura ◽  
Masahiro Ihama ◽  
Yuji Sato ◽  
Norio Yoshida ◽  
...  
Keyword(s):  
Grain Size ◽  
Selective Laser Melting ◽  
Laser Melting

Processing and Characterization of Ti-6Al-4V Samples Manufactured by Selective Laser Melting

2016 ◽  
Vol 704 ◽  
pp. 260-268 ◽  
Author(s):  
Perla Sarria ◽  
Yadir Torres ◽  
Francisco José Gotor ◽  
Eliel Gutiérrez ◽  
Melchor Rodríguez ◽  
...  
Keyword(s):  
Oxide Layer ◽  
Selective Laser Melting ◽  
Surface Effect ◽  
Stress Relief ◽  
Scratch Resistance ◽  
Micro Hardness ◽  
Laser Melting ◽  
Scratch Tests

Titanium and its alloys are well known as one of the best in-vitro and in-vivo bone replacement metallic biomaterial due to its excellent balance between biomechanical and biofunctional properties. The selective laser melting (SLM) method has a lower cost and shorter manufacturing time than the conventional routes used in the fabrication of titanium alloys. In this work, Ti6Al4V sheets were manufactured by SLM (LM samples) and subsequently annealed for stress relief at 750 oC for 10 min (LM-A samples). SEM, XRD and contact profilometry measurements were carried out to characterize the elemental composition, phases and surface morphology of different samples. A micro-tribo-mechanical evaluation was also performed by micro-indentation and scratch tests. The resulting surface was rough (Ra = 9.1 ± 0.5 μm) for all samples, showing protuberances with spherical morphology. For annealed samples, an oxide layer composed of rutile and Al2O3 was observed that increased the micro-hardness of the surface in LM-A sheets. However, after removing this oxide layer, the micro-hardness of the LM-A sheets was reduced when compared to LM samples as a result of the stress relief. A direct relationship between Vickers micro-hardness and scratch resistance was always observed. Therefore, LM-A sheets showed higher scratch resistance at low loads (oxidized surface effect) than LM samples, but lower resistance at high loads (bulk effect).

Formation of Structure in Titanium Lightweight Structures Made by Selective Laser Melting

2019 ◽  
Vol 946 ◽  
pp. 990-995 ◽  
Author(s):  
Evgenii Borisov ◽  
Anatoly Popovich ◽  
Vadim Sufiiarov ◽  
Igor Polozov ◽  
Alexey Orlov ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Grain Size ◽  
Selective Laser Melting ◽  
Powder Material ◽  
Mechanical Characteristics ◽  
Microstructural Analysis ◽  
Laser Melting ◽  
Lightweight Structures ◽  
Before And After ◽  
Different Parts

The results of the analysis of the plasma atomized powder material are shown. An analysis of the microstructure in lightweight constructions made of VT6 alloy by selective laser melting was carried out. The microstructure and mechanical characteristics of the obtained structures were studied before and after heat treatment. Measurement of grain size in the microstructural analysis gave a more complete picture of the state of the structure in different parts of the sample formed as a result of growing by selective laser melting, in a mesh and compact. In the course of the work, the peculiarities of the growth of grains in bars of the mesh construction are revealed depending on their location.

scholarly journals A Comprehensive Study of Steel Powders (316L, H13, P20 and 18Ni300) for Their Selective Laser Melting Additive Manufacturing

Metals ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 86 ◽  
Author(s):  
Jujie Yan ◽  
Yinghao Zhou ◽  
Ruinan Gu ◽  
Xingmin Zhang ◽  
Wai-Meng Quach ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Surface Structure ◽  
Oxide Layer ◽  
Selective Laser Melting ◽  
Photoelectron Spectroscopy ◽  
Raw Material ◽  
Powder Materials ◽  
X Ray Diffraction ◽  
Laser Melting ◽  
X Ray

The determination of microstructural details for powder materials is vital for facilitating their selective laser melting (SLM) process. Four widely used steels (316L, H13, P20 and 18Ni300) have been investigated to detail their powders’ microstructures as well as laser absorptivity to understand their SLM processing from raw material perspective. Phase components of these four steel powders were characterized by X-ray diffraction (XRD), synchrotron radiation X-ray diffraction (SR-XRD) and scanning electron microscopy (SEM). X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM) were utilized to reveal the surface structure of these four steel powders. It is found that phase components of H13, P20 and 18Ni300 are mainly composed of martensite and a small amount of austenite due to the high cooling rate during gas atomization processing, while 316L is characterized by austenite. XPS results show that the four steel powders all possess a layered surface structure, consisting of a thin iron oxide layer at the outmost surface and metal matrix at the inner surface. It is found that the presence of such oxide layer can improve the absorptivity of steel powders and is beneficial for their SLM process.

MANUFACTURING NOVEL HEAT TRANSFER DEVICES BY SELECTIVE LASER MELTING

Equipment ◽  
2006 ◽  
Author(s):  
S. Tsopanos ◽  
M. Wong ◽  
I. Owen ◽  
C. J. Sutcliffe
Keyword(s):  
Heat Transfer ◽  
Selective Laser Melting ◽  
Laser Melting
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