European Journal of Materials Science and Engineering最新文献_第7页

Consolidation of complex-shape zircon compacts through agar gelation 通过琼脂凝胶作用固化复杂形状的锆石致密物

European Journal of Materials Science and Engineering Pub Date : 2022-05-21 DOI: 10.1080/26889277.2022.2081621

E. Rosado, C. Alcázar, P. Recio, R. Moreno

{"title":"Consolidation of complex-shape zircon compacts through agar gelation","authors":"E. Rosado, C. Alcázar, P. Recio, R. Moreno","doi":"10.1080/26889277.2022.2081621","DOIUrl":"https://doi.org/10.1080/26889277.2022.2081621","url":null,"abstract":"Abstract Zirconium silicate (zircon, ZrSiO4) is a ceramic material with excellent thermal properties, such as low thermal conductivity and high thermal shock resistance. In this work, dense zircon complex shaped parts were obtained by aqueous gelcasting through agar gelation. The colloidal stability study was performed through zeta potential measurements as a function of pH and polyacrylic-based deflocculant concentration (PAA). The rheological study was carried out varying the solids content, the dispersant concentration, and the sonication mixing time, the best results being obtained for 0.1 wt.% PAA and 1 min sonication. The viscosity versus temperature curves were recorded on cooling for the zircon-agar mixtures showing a gelling temperature of approximately 35 °C. Better gelcasting performance was achieved with suspensions prepared at a solids loading of 40 vol.%. Dynamic sintering (25–1550 °C) and isothermal sintering tests (1550 °C and 1600 °C) were carried out, studying the shrinkage and densification of the material. Finally, the evolution of phases and the microstructure of the sintered parts were studied using X-ray diffraction (XRD) and scanning electron microscopy (SEM). Relative densities of 94.5% TD were reached at 1600 °C/2 h, but increased to 96% with 8 h holding, with a small grain size increase from 1.8 to 2.4 µm.","PeriodicalId":32608,"journal":{"name":"European Journal of Materials Science and Engineering","volume":"1 1","pages":"407 - 421"},"PeriodicalIF":0.0,"publicationDate":"2022-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82002567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Interstitial chemistry in sintering of metallic materials – often overlooked but decisive 金属材料烧结中的间隙化学——常常被忽视，但却是决定性的

European Journal of Materials Science and Engineering Pub Date : 2022-05-17 DOI: 10.1080/26889277.2022.2073567

R. de Oro Calderon, C. Gierl-Mayer, H. Danninger

引用次数: 1

Effect of printing parameters on sintered WC-Co components by binder jetting 打印参数对粘结剂喷射烧结WC-Co组分的影响

European Journal of Materials Science and Engineering Pub Date : 2022-05-11 DOI: 10.1080/26889277.2022.2076617

M. Mariani, D. Mariani, G. P. De Gaudenzi, N. Lecis

{"title":"Effect of printing parameters on sintered WC-Co components by binder jetting","authors":"M. Mariani, D. Mariani, G. P. De Gaudenzi, N. Lecis","doi":"10.1080/26889277.2022.2076617","DOIUrl":"https://doi.org/10.1080/26889277.2022.2076617","url":null,"abstract":"Abstract Hardmetals are materials employed to produce cutting and forming tools as well as wear resistant parts. Standard powder metallurgy suffers limitations in the manufacturing of shapes required by application-oriented design. Therefore, there is interest for the implementation of additive manufacturing, in particular low temperature techniques as binder jetting because they allow to preserve microstructures and peculiar properties. In our work, the powder was tungsten carbide with 12 wt.% cobalt (WC-Co). Shaping by binder jetting was followed by curing treatment to promote the binder polymerization, vacuum sintering and sinter-HIP to achieve near-full density. The powder was analysed in terms of size and shape, to determine its suitability for the procedure. Then, the effects of different combinations of printing parameters, layer thickness (50–100 μm) and binder saturation (60/75/90%), on the density of the green bodies were analysed. Finally, the relative density of the sintered components was measured and the pores shape and size were studied by SEM imaging, to assess possible consequences of the deposition procedure. Vickers hardness along the samples cross-section was measured and correlated to the printing conditions employed.","PeriodicalId":32608,"journal":{"name":"European Journal of Materials Science and Engineering","volume":"35 1","pages":"365 - 380"},"PeriodicalIF":0.0,"publicationDate":"2022-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79189971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Fundamental aspects of processing multi-metallic components using additive manufacturing technologies 使用增材制造技术加工多金属部件的基本方面

European Journal of Materials Science and Engineering Pub Date : 2022-05-02 DOI: 10.1080/26889277.2022.2073568

Amin S. Azar, S. Diplas

{"title":"Fundamental aspects of processing multi-metallic components using additive manufacturing technologies","authors":"Amin S. Azar, S. Diplas","doi":"10.1080/26889277.2022.2073568","DOIUrl":"https://doi.org/10.1080/26889277.2022.2073568","url":null,"abstract":"Abstract Additive Manufacturing (AM) has triggered development of advanced materials and supply chain strategies. Almost all newly launched metallurgical processing routes had initial technical limitations arising from the fact that their process-property-performance relationship is not well-explored. In the same context, understanding the ramifications of the transition from “conventional” to “additive” manufacturing, requires knowledge of the physical mechanisms associated with technical challenges. The latter becomes bolder when processing of multi-metallic components is addressed. The first half of the article is devoted to the status and recent progress in AM processing practices. We emphasize on the role of processing parameters and instrumentation-material interaction in various AM methods with focus on multi-metallic materials. The second half addresses material development and performance perspectives with emphasis on multi-metallic configurations. Crucial factors for structural integrity are introduced and specific technical challenges are demonstrated, considering engineering materials for multi-metallic components. It is also demonstrated how various cooling rates measurement techniques can be utilised for assessing the cooling rates in AM. Post processing challenges associated with the corrosion performance of bimetallic components and the effect of heat treatment on AM components are also included. Finally, the role, origin and detection of residual stresses in AM components are addressed.","PeriodicalId":32608,"journal":{"name":"European Journal of Materials Science and Engineering","volume":"5 1","pages":"234 - 364"},"PeriodicalIF":0.0,"publicationDate":"2022-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87638740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Actual state-of-the-art of electron beam powder bed fusion 电子束粉末床熔合的最新技术

European Journal of Materials Science and Engineering Pub Date : 2022-04-21 DOI: 10.1080/26889277.2022.2040342

Zongwen Fu, C. Körner

引用次数: 21

Micromechanical behavior of annealed Ti-6Al-4V produced by Laser Powder Bed Fusion 激光粉末床熔合退火Ti-6Al-4V的微观力学行为

European Journal of Materials Science and Engineering Pub Date : 2022-04-11 DOI: 10.1080/26889277.2022.2063763

T. Mishurova, S. Evsevleev, Katia Artzt, J. Haubrich, I. Sevostianov, G. Requena, G. Bruno

引用次数: 2

Effect of powder variability on laser powder bed fusion processing and properties of 316L 粉末变异性对316L激光粉末床熔合加工及性能的影响

European Journal of Materials Science and Engineering Pub Date : 2022-04-11 DOI: 10.1080/26889277.2022.2064772

Dmitri Riabov, L. Cordova, E. Hryha, S. Bengtsson

{"title":"Effect of powder variability on laser powder bed fusion processing and properties of 316L","authors":"Dmitri Riabov, L. Cordova, E. Hryha, S. Bengtsson","doi":"10.1080/26889277.2022.2064772","DOIUrl":"https://doi.org/10.1080/26889277.2022.2064772","url":null,"abstract":"Abstract To date, the effects of powder properties, both physical and chemical, on the printed properties of as-built components is still a topic that is poorly understood. A contributing factor is the lack of relevant methods for evaluating the rheological properties of powder, or flowability. This study presents a review of different 316 L powder grades that were produced using various atomization techniques. The physical powder properties were evaluated using powder metallurgical techniques, a powder rheometer (FT4) and a rotating drum analyser (RPA). The results indicate that both the FT4 and RPA are suitable for powder characterization. However, the parameter selection for evaluation must be done keeping in mind the application, in this case thin layer powder spreading. It was found that all bulk powder density measurements, basic flow energy and the break energy were able to both differentiate between powder grades and predict how suitable the powder will be for the laser-based powder-bed fusion process. Despite some printability challenges of the water atomized grades at higher layer thicknesses, it was found that both gas atomized grades performed similarly despite minor differences in particle size distribution. Furthermore, powder variability did not show any detrimental effects on the resulting mechanical properties.","PeriodicalId":32608,"journal":{"name":"European Journal of Materials Science and Engineering","volume":"25 1","pages":"202 - 221"},"PeriodicalIF":0.0,"publicationDate":"2022-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84355202","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Analysis of transverse corner cracks from continuous casting process and comparison to laboratory experiments 连铸过程中横向角裂纹的分析及与室内试验的比较

European Journal of Materials Science and Engineering Pub Date : 2022-04-08 DOI: 10.1080/26889277.2022.2063764

M. Gontijo, C. Hoflehner, S. Ilie, J. Six, C. Sommitsch

{"title":"Analysis of transverse corner cracks from continuous casting process and comparison to laboratory experiments","authors":"M. Gontijo, C. Hoflehner, S. Ilie, J. Six, C. Sommitsch","doi":"10.1080/26889277.2022.2063764","DOIUrl":"https://doi.org/10.1080/26889277.2022.2063764","url":null,"abstract":"Abstract Low alloyed steel slabs produced by continuous casting can present transverse corner cracks, which are critical due to the oxide layer formed within the crack. Understanding this type of failure and reproducibility of the phenomenon through laboratory tests is of great value for dealing with this problem. The present work analyzed samples from slab corners, where cracks were identified. The fracture surfaces were examined using a scanning electron microscope (SEM) and cut to have their microstructure analyzed with a light optical microscope (LOM). Using etching to reveal the microstructure of the samples from the slabs, it was seen that the cracks were initiated and propagated at the prior austenite grain boundaries. Furthermore, the SEM images from the corner samples were compared to those from the physical simulation of the continuous casting process from previous work, and the structure found was like the ones tested at critical temperatures. The same was noted for the microstructure analysis, where cracks were also seen to follow the grain boundaries. Therefore, it was concluded that the behavior resulted from the laboratory tests performed with in-situ melted samples with the BETA 250-5 machine were in good accordance with the reality of the continuous casting process.","PeriodicalId":32608,"journal":{"name":"European Journal of Materials Science and Engineering","volume":"57 1","pages":"222 - 233"},"PeriodicalIF":0.0,"publicationDate":"2022-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80224133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The effect of ultrafast heating rate on the elemental distribution between phases in a low carbon steel 超快加热速率对低碳钢相间元素分布的影响

European Journal of Materials Science and Engineering Pub Date : 2022-04-05 DOI: 10.1080/26889277.2022.2060761

M. A. Valdes-Tabernero, M. Monclús, I. Sabirov, J. Molina-Aldareguia, R. Petrov, J. Wang, I. Timokhina

{"title":"The effect of ultrafast heating rate on the elemental distribution between phases in a low carbon steel","authors":"M. A. Valdes-Tabernero, M. Monclús, I. Sabirov, J. Molina-Aldareguia, R. Petrov, J. Wang, I. Timokhina","doi":"10.1080/26889277.2022.2060761","DOIUrl":"https://doi.org/10.1080/26889277.2022.2060761","url":null,"abstract":"Abstract This work focuses on the effect of heating rate, i.e. conventional heating (CH) and ultrafast heating (UFH) rates on the elemental distribution between phases in a low carbon steel. Microstructural characterization was carried out using an Electron Backscatter Diffraction (EBSD) and Atom Probe Tomography (APT) technique. Nanohardness of individual microconstituents was measured. It is shown that the applied heat treatments result in the formation of multiphase microstructures consisting of a ferritic matrix with embedded martensite and retained austenite. The ferritic matrix of the CH material was fully recrystallized, whereas both recrystallized (coarser) and non-recrystallized (finer) ferritic grains were present in the matrix of the UFH material. APT analysis indirectly confirmed that recrystallized grains after both heat treatments have a lower carbon content, when the non-recrystallized grains after UFH have a higher carbon content. It correlates with the nanohardness results, i.e. non-recrystallized grains show higher hardness, while recrystallized grains have a lower hardness. The segregations of C and Mn atoms at the martensite/ferrite interface were observed after both treatments. It is hypothesized that the segregations are formed under negligible partitioning local equilibrium condition during CH, whereas the solute drag effect results in the formation of interface segregation during UFH.","PeriodicalId":32608,"journal":{"name":"European Journal of Materials Science and Engineering","volume":"9 1","pages":"171 - 185"},"PeriodicalIF":0.0,"publicationDate":"2022-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87220589","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

DEVELOPMENT OF POLYMER - BAMBARANUT SHELL COMPOSITE FOR STRUCTURAL BOARD APPLICATION 结构板用聚合物-竹壳复合材料的研制

European Journal of Materials Science and Engineering Pub Date : 2022-03-20 DOI: 10.36868/ejmse.2022.07.01.015

D. Gital, Abdulkabir Raji

{"title":"DEVELOPMENT OF POLYMER - BAMBARANUT SHELL COMPOSITE FOR STRUCTURAL BOARD APPLICATION","authors":"D. Gital, Abdulkabir Raji","doi":"10.36868/ejmse.2022.07.01.015","DOIUrl":"https://doi.org/10.36868/ejmse.2022.07.01.015","url":null,"abstract":"This paper is aimed at investigating the use of Bambaranut shell powder as reinforcing material in polymer matrix for structural board production and to investigate its effect on the physical and mechanical properties of the resulting composites. Composites were prepared with 10%, 20%, 30%, 40% and 50% by weight of Bambaranut shell of particle size 150 µm. SEM was used to analyze the internal structure of the composites. Analysis of variance was employed to investigate the influence of the addition of Bambaranut shell particle on both the mechanical and physical properties of the samples. The properties measured range as follows: water absorption ( 0.65 to 1.95 %); density (0.1044 to 0.1129 g/〖cm〗^3 ); ultimate tensile strength (20.90 to 11.76 MPa); tensile modulus (102.55 to 161.41 MPa), flexural modulus (3818.53 to 2283.70 MPa) and flexural strength (29.96 to 53.09 MPa). Results show that as percentage of Bambaranut shell particle increased from 10% to 50% there was a decrease in tensile, compressive, impact Strength and flexural modulus. Also, increase in weight percentage of Bambaranut shell particles lowered the density and raised the hardness, and water absorption of the composites. The mechanical properties showed that the composites produced can be used for structural application.","PeriodicalId":32608,"journal":{"name":"European Journal of Materials Science and Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44262518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0