Marco Actis Grande

Marco Actis Grande
Politecnico di Torino | polito · DISAT - Department of Applied Science and Technology

MSc in Materials Science, PhD in Metallurgy

About

143
Publications
25,389
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1,074
Citations
Citations since 2016
29 Research Items
468 Citations
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2016201720182019202020212022020406080100
2016201720182019202020212022020406080100
2016201720182019202020212022020406080100

Publications

Publications (143)
Article
Full-text available
In this work, AA1070 aluminium alloy sheets are joined using TIG and MIG welding after three different edge preparations. Shearing, water jet and plasma-cut processes were used to cut sheets, subsequently welded using ER5356 and ER4043 filler metals for TIG and MIG, respectively. Mechanical properties of the obtained sheets were assessed through te...
Article
Full-text available
In electrical machines, laminated steels are commonly adopted as soft magnetic materials, while for permanent magnets, sintered ferrites and NdFeB are the most common solutions. On the other hand, the growing demand for volume reduction with the increment of efficiency leads to the necessity of exploring other magnetic materials able to face the ch...
Article
Full-text available
In the last years, functionalized powders are becoming of increasing interest in additive manufacturing (particularly in laser powder bed fusion processing, L-PBF), due to their improved flowability and enhanced processability, particularly in terms of laser absorbance. Functionalized powders may also provide higher final mechanical or physical pro...
Article
Full-text available
During the past 50 years, the aim to reduce the eddy current losses in magnetic cores to a minimum led to the formulation of new materials starting from electrically insulated iron powders, today called Soft Magnetic Composites (SMC). Nowadays, this promising branch of materials is still held back by the mandatory tradeoff between energetic, electr...
Article
Full-text available
Metal–metal composites represent a particular class of materials showing innovative mechanical and electrical properties. Conventionally, such materials are produced by severely plastically deforming two ductile phases via rolling or extruding, swaging, and wire drawing. This study presents the feasibility of producing metal–metal composites via a...
Preprint
Metal/metal composites represent a particular class of materials showing innovative mechanical and electrical properties. Conventionally, such materials are produced by severely plastically deforming two ductile phases via rolling or extruding, swaging, and wire drawing. This study presents the feasibility of producing metal/metal composites via a...
Article
Full-text available
In this study, the efficacy of an innovative ultra-fast sintering technique called electro-sinter-forging (ESF) was evaluated in the densification of Fe-Cr-C steel. Although ESF proved to be effective in densifying several different metallic materials and composites, it has not yet been applied to powder metallurgy Fe-Cr-C steels. Pre-alloyed Astal...
Preprint
Full-text available
Urgent environmental challenges and emerging additive manufacturing (AM) technologies push research towards more performant and new materials. In the field of metallurgy, high entropy alloys (HEAs) have recently represented a topic of intense research because of their promising properties, such as high temperature strength and stability. Moreover,...
Preprint
Full-text available
In this study one of the most innovative sintering techniques up to date was evaluated: Electro-Sinter-Forging (ESF). Despite it has been proved to be effective in densifying several different metallic materials and composites, bearing steels such as 100Cr6 have never been processed so far. Pre-alloyed Astaloy CrM powders have been ad-mixed with ei...
Article
Full-text available
Additive manufacturing is a key enabling technology in the manufacture of highly complex shapes, having very few geometric limitations compared to traditional manufacturing processes. The present paper aims at investigating mechanical properties at cryogenic temperatures for a 316L austenitic stainless steel, due to the wide possible cryogenic appl...
Article
Full-text available
This paper reports the results of the designing, manufacturing and characterization of a jewel obtained by means of coupling the dogmas of industrial design to the analytical engineering approach. The key role in the design of the jewel was played by an in-house synthesized Neodymium (Nd)-doped phosphate glass, selected due to its easy handling and...
Article
The main aim of the present paper is evaluated the mechanical properties, microstructures and porosity of Ti6Al4V and CoCrW alloys produced by Laser Powder Bed Fusion (L-PBF) as an additive manufacturing (AM) technology. The mechanical properties were follows: For Ti6Al4V alloy the UTS was 1180 MPa; the YS was in the range <600; 745 MPa>. For CoCrW...
Article
Full-text available
p class="AMSmaintext">The goal of the present work is to evaluate mechanical properties and to analyse the microstructure of 316L stainless steel produced by Laser Powder Bed Fusion (L-PBF) follow by rolling with different thickness reduction under ambient and cryogenic conditions. The samples before rolling were heat treated. The static tensile te...
Article
Full-text available
In powder metallurgy (PM), severe plastic deformation (SPD) is a well-known technological solution to achieve interesting properties. However, the occurrence of pores in the final product may limit these properties. Also, for a given type of microstructure, the stereometric parameters of the pore structures, such as shape (represented by Aspect and...
Article
Full-text available
Aluminum alloys are widely used to produce automotive components, thanks to their great mechanical properties–to–density ratio. Engine components such as pistons are conventionally produced by casting of Al–Si eutectic alloys (Silumin alloys) such as EN AC 48000. Due to the harsh working conditions and the lower ductility if compared to aluminum–si...
Article
In the field of electrical machines, the actual research activities mainly focus on improving the energetic aspects; for this reason, new magnetic materials are currently investigated and proposed, supporting the design and production of magnetic cores. The innovative aspects are related to both hard and soft magnetic materials. In the case of perm...
Article
Full-text available
Electrical machines cover a very wide range of applications in many industrials sectors and the research to improve the performance of those applications is recently leading to the development of new solutions. Those devices are generally equipped with magnetic circuits made of laminated ferromagnetic steel, but in the last decade, new magnetic mat...
Conference Paper
In the field of metallurgy, high entropy alloys (HEAs) have recently represented a topic of intense research because of their promising properties, such as high temperature strength and stability. Moreover, this class of multi-principal element alloys (MPEAs) have opened up researcher community to unexplored compositional spaces, making prosper lit...
Conference Paper
Permanent magnets are used in countless applications. Rare earths availability is reduced, while the demand is continuously increasing, together with the prices. Many hydrogen-based methods of recycling NeFeB magnets have already been adopted and studied. Three alternative processes are here proposed, based only on mechanical treatments. The impact...
Article
Full-text available
Is there a new material for use in jewelry, matching gold and precious stones, capable of maintaining the same perception of “preciousness” but that is also more sustainable, ethical, and inexpensive? This article deals with a case study within the European EcoDesign Network research project, aimed at investigating how sustainable design can help p...
Article
Full-text available
p class="AMStitle"> The interest around the adoption of Soft Magnetic Composite materials (SMC) in the realization of electric machines, or parts of electric machines, is continuously increasing. The main reason lies on the opportunity to realize magnetic circuits following a 3D design procedure, which is not allowed with the adoption of the tradit...
Poster
The production of equiatomic AlTiCuNb high entropy alloy (HEA) by mechanical alloying (MA) of pure elemental powders was investigated. HEAs are multi-principal element systems with four or more elements in near equiatomic concentration. The maximization of configurational entropy by increasing the number of principal elements allows to stabilize di...
Article
A new technology may be proposed for the realization of the magnetic parts of electromechanical devices, mainly for small electric machines. Such a technology provides the substitution of the traditional magnetic sheets with parts obtained by molding special magnetic powders (Soft Magnetic Composites or SMC). The advantages may be constituted not o...
Article
Wear (pin-on-disk) tests of low-alloy powder steels (with 0.5 and 0.65% C) are performed after vacuum sintering combined with hardening. The studied alloying systems are 0.65% C + 1.5% Cr + 0.2% Mo, 0.65% C + 0.9% Ni + 0.9% Mo + 0.2% Mn and 0.5% C + 4% Ni + 1.5% Cu + 0.5% Mo. The wear resistance of the steels after the hardening sintering is an ord...
Article
Several different methods can be used to define the fineness of a precious alloy: from the merely comparative touchstone method to the extreme precision of ICP-MS. However, the majority of tests, and in particular those guaranteeing the level of precision requested by law, are destructive. According to new market requirements, demanding a fineness...
Conference Paper
A new technology may be proposed for the realization of the magnetic parts of electromechanical devices, mainly for small electric machines. Such a technology provides the substitution of the traditional magnetic sheets with parts obtained by molding special magnetic powders (Soft Magnetic Composites or SMC). The advantages may be constituted not o...
Article
Full-text available
Precious metals are widely used in a variety of different industry mainly for their inertness and their intrinsic value. This latter, is also the reason to pursue time and material saving technologies, reducing scraps and metal losses. Powder Metallurgy offers some interesting and effective alternative to traditional precious metals forming, aiming...
Article
The paper investigates the effects of the processing parameters of an innovative electro-discharge sintering process named Electro-Sinter-Forging applied to a Fe-Cr-Mo powder. Consolidation is obtained by the superposition of a single electromagnetic pulse with a single mechanical pulse. Two high-speed numerically controlled axes are used in the ma...
Article
Full-text available
Precious metals are widely used for a variety of applications, among which are luxury goods, biomedical devices, and electronic components. Requiring precise components, those sectors are usually looking into lost-wax casting, machining, and, more recently, metal injection moulding. Material or (thermal) energy consumption and demand for the aforem...
Article
Full-text available
Goal of the present paper is the analysis of the interparticle neck connections in a system made of insulated iron powder compounds with dierent additions of an AlMgSiCu alloy (0.25, 0.5 and 0.75 wt%). The introduction of the aluminium alloy powder has been made in order to improve the mechanical properties, evaluated as the transverse rupture stre...
Article
Full-text available
The contribution deals with dry sliding wear behaviour of different Fe–Cr–Mo–[Mn]–[Cu] sintered powder metallurgy systems using a pin on disc test. The effect of chemical composition and two different processing conditions, industrial atmosphere at 1453 K (1180°C) and vacuum atmosphere at 1513 K (1240°C) related to a new proposed type of sinterhard...
Article
Full-text available
The aim of this paper is to present experimental results on the evolution of tensile strength of some low alloyed steels function the copper content. There are prepared six types of mixtures as following: A1 (Fe), A2 (Fe+1.5%Cu), A3 (Fe+3%Cu), A4 (Fe+0,2%C), A5 (Fe+0,2%C+1.5%Cu), A6 (Fe+0,2%C+3%Cu). All six mixtures were pressed at 400, 500 respect...
Article
Full-text available
The present work investigates the possibility of using powder metallurgy processing for producing a metal matrix composite. Materials were prepared from AlSi5Cu2 chips with reinforcement of 10, 15, 20 wt. % silicon carbide. Aluminum alloy chips were milled with SiC powder in a high-energy ball mill by 40 hours. Mechanical alloying process lead to o...
Article
Full-text available
The present paper focused on the effects of aluminium alloy addition on the behaviour of soft magnetic materials at low frequencies. The microstructure investigation reveals that for materials with high aluminium contents, the pores are oriented near or surrounding the aluminium particles. The microstructure investigation reveals that for materials...
Article
Full-text available
Various techniques and technologies have been developed and fine-tuned in recent years which have made it possible to improve the investment casting process and extend its field of applicability such as, for example, the application of rapid prototyping, rapid manufacturing, casting simulation and “non-traditional” materials. In the past decades, c...
Article
Full-text available
Goal of the present paper is the analysis of the fracture surfaces of an Insulated Iron Powder Compound (IIPC) with different additions of aluminium alloy (0.25, 0.5 and 0.75 wt.%), in order to improve the mechanical properties, evaluated as the transverse rupture strength (TRS) with sufficient magnetic properties (mainly represented by the iron lo...
Article
Full-text available
The jewelry making has been traditionally considered handcrafted and hinged on the ability of goldsmiths to create components and assemblies. In recent years, however, a profound transformation has begun, driven by the global markets requiring robust engineering approaches to the analysis of new materials and of product/process optimization. Moreov...
Article
Full-text available
The main aim of this paper is to investigate the effects of different processing conditions on the behavior of a P/M (Powder Metallurgy) aluminum alloy with respect to the microstructure, fracture and mechanical properties. Moreover, the evolution of porosity as a consequence of pressing, sintering and ECAPing processes was investigated. A commerci...
Article
Full-text available
The paper is focused on the role of the pressing pressure on the densification behaviour of PM aluminium alloys. Commercially aluminium based powders Al-Mg-Si-Cu-Fe and Al-Zn-Mg-Cu-Sn were used as materials to be investigated. The apparent density of the powder mixes was determined according to MPIF St. 04. A set of cylinder test specimen 55 x 10 x...
Article
Full-text available
The present paper deals with the sliding wear behaviour of prealloyed chromium sintered steel (Fe-1.5Cr-0.2Mo) with graphite powder added in the amount of 0.7%. The wear characteristics, such as profilograms, wear tracks morphology and wear curves of the as sintered specimens and TiCN coating were investigated through pin-on-disk tests. The specime...
Article
Full-text available
The aim of this paper is to deepen the understanding of the influence of the cooling step on the final properties of sinter-hardened components, mainly focusing on part geometry (through the definition of an A/M ratio) and cooling rate. A commercial Distaloy DH powder has been uniaxially pressed in different shapes, identified in terms of area/mass...
Conference Paper
Full-text available
The paper presents the tensile behavior of sintered steels developed through a new process called gascarbusintering (GCS), consisting of carburizing in gas (CH4) of a set of iron based powder compacts followed by sintering. The influence of compaction pressure and dwell time at the carburizing temperature on the tensile properties of steels process...
Article
Full-text available
The paper is focused on the processing of aluminum alloy chips using powder metallurgy. Chips obtained from recycled AlSi5Cu2 alloy were ball milled with the addition of silicon carbide powder with an average size of 2μm. Mechanical alloying process was employed to obtain homogeneous composite powder. The effect of processing time (0 - 40h) on the...
Article
Full-text available
The paper focuses on the effect of both the aluminium alloy addition and microstructural inhomogeneties on the magnetic behaviour of soft magnetic materials tested at low frequencies. The IIPC material (base on the commercial Somaloy 1P powder) has been blended with different amounts of commercially aluminium alloy Alumix 321 (0, 5 and 10 wt %). Sp...
Article
The main aim of this paper is to investigate, by means of comparison of experimental studies and mathematical models, the evolution of porosity as consequence of pressing, sintering and ECAPping an aluminium based powder (6xxx). After applying the compacting pressure, specimens were dewaxed in a ventilated furnace at 400 degrees C for 60 min. Sinte...
Article
Ternary Ni60Fe30M10 (M = Cr, Mn, Cu) sintered alloys have been characterized by means of microstructural and electrochemical techniques in view of their possible applications as electrocatalytic materials for hydrogen evolution reaction (HER). Well-mixed powders of nickel, iron and copper, manganese, or chromium were pressed together under high pre...
Article
Full-text available
The present paper deals with the evaluation of different vacuum heat treatments on the fracture surfaces of a low alloyed sintered steel in correlation with the mechanical and plastic properties achieved. The heat treatment conditions consist of the sintering process in vacuum furnace at 1393 K for 1800 s with an integrated final tempering at 473 K...
Article
The main aim of this paper is to investigate the evolution of porosity as consequence of pressing, sintering and ECAPping an aluminium based powder, by means of comparison of calculated and experimental results. After applying compacting pressure, specimens were dewaxed in a ventilated furnace at 400 °C for 60 min. Sintering was carried out in a va...
Article
The main aim of the paper are analysis the effect of the processing conditions on the magnetic behaviour of iron insulated powder compound (IIPC) materials admixed by aluminium alloy at low frequencies. Results show that the higher applied compactive pressures cause a greater reduction of volumes and of present porosities. The behaviour of powders...
Article
Full-text available
The main aim of this paper is to show porosity evolution during application of various processing conditions including pressing, sintering and equal channel angular pressure. An aluminium based powder (Al-Mg-Si-Cu-Fe) was used as investigated material. After applying different pressing pressures (400 and 600 MPa), specimens were dewaxed in a ventil...
Article
Full-text available
The present paper deals with the evaluation of the effect of different vacuum heat treatments on the microstructure and fracture surfaces of a low alloyed sintered Fe-[1.5Cr-0.2Mo]-0.6C steel, in correlation with the mechanical and plastic properties achieved. The heat treatment consists of the sintering process in vacuum furnace at 1393 K for 1800...
Article
The main aim of this paper is the analysis of the effects of various processing conditions on the magnetic, mechanical, and energetic properties of mixture systems consisting of insulated iron powder compound and aluminum alloy. Specimens with a different green density (obtained with compacting pressures of 400, 600, and 800 MPa) were treated in di...
Article
Full-text available
The present paper deals with the tribological behaviour of the boride and carbide hardmetals evaluated by performing comparative dry sliding pin-on-disc experiments using normal contact loads. Analyses of the wear performance results, microstructural evaluation and processing conditions effect indicate that microstructure inhomogenities play an imp...
Article
Full-text available
The paper is focused on the wear mechanism of orbital forged and equal-channel angular extruded Cu OFHC (oxygen-free high thermal conductivity) material. The wear behaviour of the Cu OFHC material is investigated through pin-on-disc tests. Two different processing conditions have been used, equal-channel angular processing (ECAP) and orbital (radia...