Influence of Extrusion Parameters on Microstructure and Texture of AlSi25Cu4Mg1

Pyzalla, A.; Wegener, J.; Müller, K.; Liss, Klaus-Dieter

doi:10.4028/www.scientific.net/msf.331-337.781

Cited by 5 publications

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“…FTC offers a good ratio of hardness and fracture toughness [7] . Powders containing 10 vol.-% of HPs were blended in a shaker-mixer for 1 h. The steel 1.2380 with 10 vol.-% of WC/W 2 C (FTC) has a theoretic density of 8.49 g cm À3 , while the one of 1.2344 with 10 vol.-% of FTC is 8.65 g cm À3 .…”

Section: Hard Phases and Sample Designationmentioning

confidence: 99%

Microstructure Characterization of Tool Steel Claddings Co‐Extruded on Low Alloyed Steel Substrates

et al. 2009

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The necessity for highly abrasion-resistant materials in applications, for instance in the mining and cement industry, has lead to the development of metal matrix composites (MMC) produced by powder metallurgy (PM). So far, hot isostatic pressing (HIP) has been the usual method for producing low alloyed steel rods cladded with thick wearresistant layers of MMCs. HIP processes in this field, however, have strong limitations, such as furnace size, production costs, etc. Hot direct extrusion has recently been introduced as a novel process for the production of low alloy steel rods cladded with MMCs as high wear resistant coatings. [1] Its basic concept and the properties of the obtained materials are described elsewhere. [2,3] In contrast to HIP, the hot extrusion process allows the cost-efficient production of long products with full density of the coating and comparable properties. The influence of carbon diffusion and heat treatment on the mechanical properties has already been investigated for some of the materials presented in this contribution. [4,5] In this paper, four different combinations of substrate and wear-resistant coating were investigated. These are based on two tool steel powders, with or without hard particle (HP) addition, which are cladded on two different low-alloy steel substrate materials. The purpose of this work is to characterize the interface microstructure in these hot extruded cladded rods. Electron backscatter diffraction (EBSD) using scanning electron microscopy (SEM) was used and appears to be particularly well-suited for study in the influence of HP addition on the formation and distribution of chromium-and vanadium-rich carbides. Calculations performed using the program Dictra revealed a strong carbon enrichment of the cladding at the interface to the low-alloyed steel substrate. [6] Thus, EBSD was also employed to check for the presence of retained austenite. Materials Processing and Experiments MaterialsA gas-atomized cold-work tool steel powder, X220CrVMo13-4 (1.2380), and a gas-atomized hot-work tool-steel powder, X40CrMoV5-1 (1.2344), were used as coating materials for the PM-MMCs. A hot-work steel bar, made of 55NiCrMoV7 (1.2714), and a non-alloy structural steel S355 with a diameter of 30 mm were chosen as the substrate materials for the cladded rods. The chemical composition of the tool steel powders and the substrates are given in Table 1. An earlier work gives more details about the steel powder 1.2380 as well as the substrate steel 1.2714 [4] . The steel powder X40CrMoV5-1 is based on the hot-work tool-steel 1.2344 exhibiting a high wear and thermal shock resistance in a temperature range of 400-700 8C, as well as a high level of toughness and ductility. It can be heat treated to a typical hardness of 50-56 HRC and contains virtually no carbides in its martensitic microstructure, depending on the heat treatment applied. The substrate made of the non-alloy structural steel S355 was selected due to its low cost, good weldability and cold formability, as well as a high fati...

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Section: Hard Phases and Sample Designationmentioning

confidence: 99%

Microstructure Characterization of Tool Steel Claddings Co‐Extruded on Low Alloyed Steel Substrates

et al. 2009

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Metal Working: Extrusion

Müller

2001

Encyclopedia of Materials: Science and Technology

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High‐Energy X‐Rays: A tool for Advanced Bulk Investigations in Materials Science and Physics

Liss

Bartels

Schreyer³

et al. 2003

Texture, Stress, and Microstructure

187

126

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High-energy X-rays between 30 keV and 1 MeV, such as provided by modern synchrotron radiation sources as the ESRF and HASYLAB, bear the advantage of high penetration into most materials. Even heavy element compositions can be accessed in their volume. The range of applications is huge and spreads from nuclear spectroscopy to the characterization of metal extrusion under industrial conditions. This article compiles an overview over the most common instrumental diffraction techniques.Modern two-dimensional detectors are used to obtain rapid overviews in reciprocal space. For example, diffuse scattering investigations benefit from the very flat Ewald sphere as compared to low energies, which allow mapping of several Brillouin zones within one single shot. Diffraction profiles from liquids or amorphous materials can be recorded easily. For materials science purposes, whole sets of Debye-Scherrer rings are registered onto the detector, their diameters and eccentricities or their intensity distribution along the rings relating to anisotropic strain or texture measurements, respectively. At this point we stress the resolution of this technique which has to be carefully taken into account when working on a second generation synchrotron source.Energy-dispersive studies of local residual strain can be studied by a dedicated three-circle diffractometer which allows accurately to adjust the scattering angle from a defined gauge volume.Triple axis diffractometry and reciprocal space mapping is introduced and can be employed for highest resolution purposes on single crystal characterization, even under heavy and dense sample environments. Thus, the perfection of single crystals can be mapped and strain fields and superstructures as introduced by the modulation from ultrasonic waves into crystals or epitaxially grown Si/Ge layers can be investigated in detail. Phase transitions as magnetic ordering can be studied directly or through its coupling to the crystal lattice. Time resolved studies are performed stroboscopically from a sub-nanosecond to a second time scale.The combination of these techniques is a strong issue for the construction and development of future instruments.

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Influence of Extrusion Parameters on Microstructure and Texture of AlSi25Cu4Mg1

Cited by 5 publications

References 0 publications

Microstructure Characterization of Tool Steel Claddings Co‐Extruded on Low Alloyed Steel Substrates

Microstructure Characterization of Tool Steel Claddings Co‐Extruded on Low Alloyed Steel Substrates

Metal Working: Extrusion

High‐Energy X‐Rays: A tool for Advanced Bulk Investigations in Materials Science and Physics

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