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Fabrication of tailored Ti6Al4V-based materials by conventional powder metallurgy for bone implant applications 传统粉末冶金技术制备骨种植体专用ti6al4v基材料
IF 1.4 4区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING Pub Date : 2023-05-11 DOI: 10.1080/00325899.2023.2211410
L. Olmos, D. Bouvard, O. Jiménez, J. Chávez, R. Macias
ABSTRACT This works proposes a methodology for fabricating materials with specific characteristics mimicking human bones. A Ti64 alloy powder was used as the base material and it was mixed with Ag, Ta, TiN and salt particles to obtain different features. A hip-bone like component was fabricated, including a highly porous core of Ti64/25Ta/5Ag and a compact outer shell of Ti64/5Ag that is supposed to improve corrosion and osseointegration. Besides, a harder cover surface in Ti64/10TiN composite should increase the wear resistance. The green component was sintered at 1260°C in argon. Its Young’s modulus was close to the one of bones due to the added porosity, which also provided a permeability close to the one reported for trabecular bones. Tribocorrosion behaviour in simulated body fluid was improved by TiN addition. In conclusion, the proposed processing route was able to produce complex components fulfilling specific features required for human bone replacement.
本研究提出了一种制造具有特定特征的材料的方法。以Ti64合金粉末为基材,加入Ag、Ta、TiN和盐颗粒,获得不同的形貌。一个类似髋骨的部件被制造出来,包括一个高度多孔的Ti64/25Ta/5Ag核心和一个紧凑的Ti64/5Ag外壳,该外壳被认为可以改善腐蚀和骨整合。此外,在Ti64/10TiN复合材料中,更硬的覆盖表面应提高耐磨性。绿色组分在1260℃氩气中烧结。由于增加了孔隙度,其杨氏模量接近于骨的杨氏模量,这也提供了接近小梁骨的透气性。TiN的加入改善了模拟体液中的摩擦腐蚀行为。总之,所提出的加工路线能够生产出满足人类骨置换所需的特定特征的复杂部件。
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引用次数: 1
Synergetic effect of milling speed and duration on particle morphology and mechanical properties of nanocrystalline Al matrix containing SiC 铣削速度和时间对含SiC纳米晶Al基颗粒形貌和力学性能的协同效应
IF 1.4 4区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING Pub Date : 2023-05-08 DOI: 10.1080/00325899.2023.2207863
K. Nayak, J. Han, C. Jung, M. Joo, K.B. Lee, D. Bae, H.J. Choi
ABSTRACT In the present study, the composite sheets were produced by powder rolling the ball-milled Al/SiC mixture. The effect of milling speed (350–550 rev min–1) and milling duration (8 and 12 h) on the Al particle morphology and subsequent mechanical properties were examined for composites with different volume fractions of SiC. From the microstructural investigation, SiC particles are evenly distributed and well dispersed in the Al matrix; those are prepared under higher milling speed (550 rev min–1) and higher milling time (12 h). Furthermore, the flattened-shaped particle morphology was obtained under lower milling conditions, whereas the reduced-granule shape was obtained under higher milling conditions (550 rev min–1, 12 h). Consequently, the Al/SiC composite sheets made from a granule-shaped Al/SiC mixture show higher density, microhardness, and tensile strength due to significant consolidation and SiC uniformity. In addition, the tensile strength of 430.26 MPa has been achieved for the Al/2vol.-%SiC sheet compared to pure Al (393.49 MPa) under similar processing conditions.
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引用次数: 0
Effects of processing conditions and fine powder loading on real and electroactive surface areas of porous nickel manufactured by lost carbonate sintering 工艺条件和细粉掺量对损失碳酸盐烧结多孔镍实际表面积和电活性表面积的影响
IF 1.4 4区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING Pub Date : 2023-04-24 DOI: 10.1080/00325899.2023.2202953
Zejun Wang, Yuyuan Zhao
ABSTRACT The effects of five key processing parameters on the real and electroactive surface areas of porous nickel samples produced by the Lost Carbonate Sintering (LCS) process have been investigated systematically. The specific real and electroactive surface areas of the LCS porous Ni samples are 500–1600 cm−1 and 80–115 cm−1. Pore size, compacting pressure and sintering temperature have no significant effect on the surface areas. Porosity has no effect on the gravimetric real surface area, but a higher porosity leads to a lower volumetric real surface area and a higher electroactive surface area. Metal particle size has a huge effect on the surface areas of the LCS porous metal. An intermediate amount of fine Ni powder results in the highest real surface area, approximately 70% higher than the samples produced with coarse Ni powder. Samples produced with fine Ni powder can increase the electroactive surface area by up to 100%.
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引用次数: 0
Preparation of 24CrNiMoY alloy steel with high strength and toughness by selective laser melting 选择性激光熔炼制备高强度高韧性24CrNiMoY合金钢
IF 1.4 4区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING Pub Date : 2023-04-24 DOI: 10.1080/00325899.2023.2202947
M. Sun, Suiyuan Chen, M. Wei, Jing Liang, Changsheng Liu, Mei Wang
ABSTRACT 24CrNiMoY alloy steel with high strength and toughness was prepared by selective laser melting (SLM) technology. The microstructure and mechanical properties of alloy steel samples prepared by SLM using different laser energies were studied. The results showed that with increasing energy density, the internal defects of the sample first decreased and then increased, and the hardness and tensile properties also showed a trend of increasing at first but decreasing afterwards. When the energy density was 100.7 J/mm3, the alloy steel sample has the fewest defects and the highest hardness (391.2 HV0.2). The tensile strength and impact toughness also reached the best state: the tensile strength was 1252.83 MPa, the yield strength was 1041.62 MPa, the elongation to fracture was 12.89%, and the impact toughness was 65.7 J. The microstructure of 24CrNiMoY alloy steel prepared by SLM is mainly composed of fine lath martensite, which has good strength and toughness.
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引用次数: 0
Study of microstructure and mechanical properties of 17-4 PH stainless steel produced via Binder Jetting 粘结剂喷射法制备17-4 PH不锈钢的显微组织和力学性能研究
IF 1.4 4区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING Pub Date : 2023-04-20 DOI: 10.1080/00325899.2023.2202950
L. Emanuelli, Giacomo Segata, M. Perina, Martin Regolini, Valentina Nicchiotti, A. Molinari
ABSTRACT The microstructure and mechanical properties of 17-4 stainless steel produced by Binder Jetting (BJT) and heat treated according to the standard conditions for the 17-4 PH steel (H900 and H1100) were investigated. The sintered relative density is 97.8% with a slightly anisotropic shrinkage. Tensile strength and elongation are above the minimum required for the wrought steel and comparable to those of the same material manufactured by Metal Injection Molding. They are also better than those reported in the literature for the 17-4 PH stainless steel manufactured by BJT. Tensile elongation at fracture is anisotropic, highlighting a significant dependence of the non-uniform plastic deformation on the direction.
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引用次数: 0
Microstructural evolution during sintering of Fe-Cr-C steels prepared from admixed elemental powders 混合元素粉末制备Fe-Cr-C钢烧结过程中的组织演变
IF 1.4 4区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING Pub Date : 2023-04-19 DOI: 10.1080/00325899.2023.2201487
R. de Oro Calderon, C. Gierl-Mayer, H. Danninger
ABSTRACT In the upcoming years, a reduction in the use of critical elements, such as Ni and Cu, with unstable prices and high demand from the electromobility sector will become increasingly important for the PM-industry. Cr-alloyed sintered steels offer attractive properties at a moderate cost, but so far mostly Cr-prealloyed grades have been used. This work analyses the microstructural homogenisation process when Cr is introduced as admixed elemental powder. It is shown how – due to its high carbon affinity – Cr particles act as ‘internal carbon-getters’. There is an intermediate ‘heterogenization’ of the microstructure, i.e. the iron matrix is decarburised due to the formation of (Cr, Fe)-carbides. Final homogenisation depends on the formation of a transient liquid phase through the eutectic reaction between carbides and the iron matrix. Thus, the microstructure is not only sensitive to aspects such as sintering temperature or Cr-particle size but also to the heating rate and small variations in nominal carbon.
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引用次数: 0
Francisco ‘Paco’ Castro – obituary
IF 1.4 4区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING Pub Date : 2023-04-17 DOI: 10.1080/00325899.2023.2200713
I. Iturriza
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引用次数: 0
Using discrete simulations of compaction and sintering to predict final part geometry 使用压实和烧结的离散模拟来预测最终零件的几何形状
IF 1.4 4区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING Pub Date : 2023-04-12 DOI: 10.1080/00325899.2023.2198796
Gilmar Nogueira, T. Gervais, V. Peres, Estelle Marc, C. L. Martin
ABSTRACT A Discrete Element Method (DEM) model is used to simulate the compaction and sintering of ceramic oxides. The process kinematics is decomposed into loading, unloading and ejection of the pellet. Interactions between the particles are considered elastoplastic by implementing a model able to tackle large densities. A simplified approach is used in the sintering stage, which focuses on the final part geometry rather than kinetics. The results are in good agreement with experimental data and FEM simulations from the literature regarding density gradient, elastic spring-back and final geometry. The simulations show that the friction coefficient between the agglomerates and the die is the primary factor for the density gradient in the pellet. This density gradient induces non-homogeneous sintering, which results in a final geometry with a diabolo effect. It is the first time that DEM reproduces this effect with the advantage of considering explicitly the particulate nature of the powder. GRAPHICAL ABSTRACT
摘要采用离散元法(DEM)模型模拟陶瓷氧化物的压实和烧结过程。过程运动学被分解为颗粒的装载、卸载和排出。通过实现能够处理大密度的模型,粒子之间的相互作用被认为是弹塑性的。烧结阶段使用了一种简化的方法,该方法侧重于最终零件的几何形状,而不是动力学。结果与实验数据和文献中关于密度梯度、弹性回弹和最终几何形状的有限元模拟非常一致。模拟结果表明,团聚体与模具之间的摩擦系数是颗粒密度梯度的主要因素。这种密度梯度导致不均匀的烧结,从而产生具有空竹效应的最终几何形状。DEM首次再现了这种效果,其优点是明确考虑了粉末的颗粒性质。图形摘要
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引用次数: 0
Interactions of polymeric components in a POM-based binder system for titanium metal injection moulding feedstocks 基于pom的钛金属注射成型原料粘结剂体系中聚合物组分的相互作用
IF 1.4 4区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING Pub Date : 2023-03-29 DOI: 10.1080/00325899.2023.2194478
K. Lim, M. Hayat, Kumarmani Jena, Wen Zhang, Lu Li, Pengtao Cao
ABSTRACT Owing to the different characteristics of each of the multiple polymers, obtaining a homogenous metal injection moulding (MIM) feedstock blend is challenging. Therefore, studying interactions between the polymeric components is vital for achieving suitable MIM feedstocks. We report on the effects of different compatibilisers – EGMA and E40 – on the interactions in polyoxymethylene (POM) and polypropylene (PP) blends. We measured contact angles and performed Fourier transform infrared spectroscopy and atomic force microscopy analyses to identify the suitable compatibiliser that yields a feedstock with excellent properties. It was found that the binder system based on EGMA-3 demonstrates the lowest contact angle and best miscibility for the POM/PP blends compared to E40. This enhanced interaction lies in the chemistry of EGMA, having an active site that reduces the interfacial tension between the components of the POM/PP blend. Subsequently, this creates a positive interaction between the polymers and metal powders, ensuring good adhesion within the feedstock.
由于每种聚合物的不同特性,获得均匀的金属注射成型(MIM)原料混合物是具有挑战性的。因此,研究聚合物组分之间的相互作用对于获得合适的MIM原料至关重要。我们报告了不同的增容剂- EGMA和E40 -对聚甲醛(POM)和聚丙烯(PP)共混物相互作用的影响。我们测量了接触角,并进行了傅里叶变换红外光谱和原子力显微镜分析,以确定合适的相容剂,从而产生具有优异性能的原料。结果表明,与E40相比,以EGMA-3为粘结剂的POM/PP共混体系的接触角最小,混相最好。这种增强的相互作用在于EGMA的化学性质,它有一个活性位点,可以降低POM/PP共混物组分之间的界面张力。随后,这在聚合物和金属粉末之间产生了积极的相互作用,确保了原料内的良好附着力。
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引用次数: 0
Influence of iron nanopowder addition on the densification of chromium-prealloyed water-atomised powder metallurgy steel admixed with nickel 纳米铁粉添加对镍掺杂铬预合金水雾化粉末冶金钢致密化的影响
IF 1.4 4区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING Pub Date : 2023-03-27 DOI: 10.1080/00325899.2023.2190477
Swathi K. Manchili, B. Malladi, M. Vattur Sundaram, E. Hryha, L. Nyborg
ABSTRACT High sintered density is desired for heavy-duty applications and there are different ways through which the sintered density can be improved. In the current study, nanopowder is blended to the conventionally used micrometre-sized water-atomised steel powder to evaluate its impact on sintering. Both the powder variants, without and with nanopowder, were subjected to thermogravimetry analysis, and uniaxially compacted to the same green density of 7.15 g/cc or 90% relative density and sintered at 1250°C in pure hydrogen. A comparative analysis was performed with respect to the microstructural evolution between the micro and micro/nano bimodal powder compacts. JMatPro and electron backscattered diffraction was used to understand the microstructural evolution. An attempt was made to understand the improved linear shrinkage in the micro/nano bimodal powder compact using a combination of microstructure analysis and chemical analysis.
高烧结密度是重载应用所需要的,有不同的方法可以通过烧结密度来提高。在目前的研究中,将纳米粉末与常规使用的微米级水雾化钢粉混合,以评估其对烧结的影响。采用热重法分析了不含纳米粉末和含纳米粉末的两种粉末,并将其单轴压实至相同的绿密度7.15 g/cc或90%的相对密度,在1250°C的纯氢中烧结。对微/纳米双峰粉末压坯的微观结构演变进行了比较分析。利用JMatPro和电子背散射衍射分析了材料的微观组织演变。利用微观结构分析和化学分析相结合的方法,试图了解微/纳米双峰粉末压坯中线性收缩的改善。
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引用次数: 0
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Powder Metallurgy
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