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I. Hilger

Bio: I. Hilger is an academic researcher from Helmholtz-Zentrum Dresden-Rossendorf. The author has contributed to research in topics: Spark plasma sintering & Ball mill. The author has an hindex of 2, co-authored 2 publications receiving 51 citations. Previous affiliations of I. Hilger include Dresden University of Technology.

Papers
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Journal ArticleDOI
TL;DR: In this article, the feasibility of ODS steel fabrication by means of spark plasma sintering on a semi-industrial scale was demonstrated, where hot extrusion was successfully applied to produce a 2.5 kilogram batch of high-chromium steels.

57 citations

Journal ArticleDOI
TL;DR: In this paper, a planetary ball mill was used to mechanically alloy powders with nominal composition Fe-14Cr-2W-0·4Ti with Y2O3 in two different rotational speeds.
Abstract: Powders with nominal composition Fe–14Cr–2W–0·4Ti were mechanically alloyed (MA) with Y2O3 in a planetary ball mill at two different rotational speeds. Consolidation of the as milled powders was performed by spark plasma sintering (SPS). As milled powders showed a highly deformed microstructure with elongated nanometre grains and, depending upon the rotational speed, different stages of the nanocluster evolution were observed to be produced. In the case of consolidated materials, grain growth occurred during the SPS process and it was possible to observe the influence of the MA parameters, with larger and more homogeneously distributed grains at the higher rotational speed. Additionally, Ti was observed to be incorporated to the nanoclusters after SPS, indicating a further step in their evolution during consolidation. The mechanical behaviour of the SPS compacts was evaluated by tensile and small punch testing also showing the influence of the MA parameters in the material behaviour.

7 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, the effect of microstructural parameters on the microstructure, tensile properties from room temperature to 800°C and creep properties at 650°C has been investigated in a 14%Cr oxide dispersion strengthened (ODS) steel.

78 citations

Journal ArticleDOI
TL;DR: In this article, a new method is proposed for producing nanoparticle-metal composite powders for laser additive manufacturing of oxide-dispersion strengthened (ODS) alloys, and the structural properties of manufactured ODS alloys were analyzed, and their hardness, remnant porosity, and temperature-dependent compression behavior were characterized to study the effect of the composition and size of the nanoparticles on the structural and mechanical properties.

74 citations

Journal ArticleDOI
TL;DR: In this article, a transformable 9Cr oxide dispersion strengthened (ODS) steel was prepared by mechanical milling and consolidated by spark plasma sintering (SPS), and microstructural features in different fabrication stages were studied by X-ray diffraction, optical microscopy, scanning and transmission electron microscopy.

51 citations

Journal ArticleDOI
TL;DR: A review of the state of the art in oxide-dispersion-strengthened (ODS) alloy fabrication and identifying promising new routes toward ODS steels is presented in this paper.
Abstract: The standard powder metallurgy (PM) route for the fabrication of oxide-dispersion-strengthened (ODS) steels involves gas atomization to produce a prealloyed powder, mechanical alloying (MA) with fine oxide powders, consolidation, and finally thermal/thermomechanical treatment (TMT). It is well established that ODS steels with superior property combinations, for example, creep and tensile strength, can be produced by this PM/MA route. However, the fabrication process is complex and expensive, and the fitness for scaling up to the industrial scale is limited. At the laboratory scale, production of small amounts of well-controlled model systems continues to be desirable for specific purposes, such as modeling-oriented experiments. Thus, from the laboratory to industrial application, there is growing interest in complementary or alternative fabrication routes for ODS steels and related model systems, which offer a different balance of cost, convenience, properties, and scalability. This article reviews the state of the art in ODS alloy fabrication and identifies promising new routes toward ODS steels. The PM/AM route for the fabrication of ODS steels is also described, as it is the current default process. Hybrid routes that comprise aspects of both the PM route and more radical liquid metal (LM) routes are suggested to be promising approaches for larger volumes and higher throughput of fabricated material. Although similar uniformity and refinement of the critical nanometer-sized oxide particles has not yet been demonstrated, ongoing innovations in the LM route are described, along with recent encouraging preliminary results for both extrinsic nano-oxide additions and intrinsic nano-oxide formation in variants of the LM route. Finally, physicochemical methods such as ion beam synthesis are shown to offer interesting perspectives for the fabrication of model systems. As well as literature sources, examples of progress in the authors’ groups are also highlighted.

40 citations

Journal ArticleDOI
TL;DR: In this paper, a critical discussion on the mechanical alloying and spark plasma sintering of dispersion-strengthened stainless steel with emphasis on process parameters, reinforcement efficiencies, microstructural evolutions, and mechanical properties is provided.
Abstract: Although SPS has been studied for a rapidly growing number of materials, there is limited number of researches on the fabrication and microstructural characterization of stainless steels processed by SPS. This article reviewed and provided a critical discussion on the mechanical alloying (MA) and spark plasma sintering (SPS) of dispersion-strengthened stainless steel with emphasis on process parameters, reinforcement efficiencies, microstructural evolutions, and mechanical properties. The influence of spark plasma sintering process parameters on microstructure, phase evolution, and mechanical properties of reinforced stainless steels is reviewed in this work. The role of alloying elements and ceramic reinforcements, their dispersion into the stainless steel matrix, and the importance of matrix-reinforcement interface are highlighted. Current and potential areas of applications of PM stainless steel and suggestions for future research are discussed in this paper.

37 citations