Microstructure and mechanical properties of Fe3Al-based alloys with strengthening boride precipitates

Krein, Ronny; Schneider, Andreas; Sauthoff, Gerhard; Frommeyer, G.

doi:10.1016/j.intermet.2007.02.005

Cited by 68 publications

(40 citation statements)

References 39 publications

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“…Precipitates, which are available in equilibrium in many of the Fe-Al-X systems, have a strong strengthening effect at high temperatures while they prevent grain coarsening but frequently lead to a considerable embrittlement at low or even ambient temperatures [37]. The effects of metallic substitutional atoms, and interstitials, such as boron [89] and carbon [90][91][92], on the mechanical and corrosion properties of Fe-Al alloys were also studied at different temperatures. Carbon produces plate-like -carbide ( ) precipitates which are predominantly located along dislocations and grain boundaries [35].…”

Section: Alloying Elementsmentioning

confidence: 99%

“…The effects of metallic substitutional atoms, and interstitials, such as boron [89] and carbon [90][91][92], on the mechanical and corrosion properties of Fe-Al alloys were also studied at different temperatures. Carbon produces plate-like κ-carbide (Fe 3 AlC x ) precipitates which are predominantly located along dislocations and grain boundaries [35].…”

Section: Alloying Elementsmentioning

confidence: 99%

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A Review on the Properties of Iron Aluminide Intermetallics

2016

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Iron aluminides have been among the most studied intermetallics since the 1930s, when their excellent oxidation resistance was first noticed. Their low cost of production, low density, high strength-to-weight ratios, good wear resistance, ease of fabrication and resistance to high temperature oxidation and sulfurization make them very attractive as a substitute for routine stainless steel in industrial applications. Furthermore, iron aluminides allow for the conservation of less accessible and expensive elements such as nickel and molybdenum. These advantages have led to the consideration of many applications, such as brake disks for windmills and trucks, filtration systems in refineries and fossil power plants, transfer rolls for hot-rolled steel strips, and ethylene crackers and air deflectors for burning high-sulfur coal. A wide application for iron aluminides in industry strictly depends on the fundamental understanding of the influence of (i) alloy composition; (ii) microstructure; and (iii) number (type) of defects on the thermo-mechanical properties. Additionally, environmental degradation of the alloys, consisting of hydrogen embrittlement, anodic or cathodic dissolution, localized corrosion and oxidation resistance, in different environments should be well known. Recently, some progress in the development of new micro-and nano-mechanical testing methods in addition to the fabrication techniques of micro-and nano-scaled samples has enabled scientists to resolve more clearly the effects of alloying elements, environmental items and crystal structure on the deformation behavior of alloys. In this paper, we will review the extensive work which has been done during the last decades to address each of the points mentioned above.

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Section: Alloying Elementsmentioning

confidence: 99%

Section: Alloying Elementsmentioning

confidence: 99%

A Review on the Properties of Iron Aluminide Intermetallics

2016

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“…Hardness and wear resistance of as-cast Fe 3 Al alloys were found to be comparable with AISI 1060 carbon steel and AISI 304 stainless steel, but much lower than high Cr white cast iron [17]. By the addition of hard phase particles such as Fe 3 AlC 0.5 , TiC, Al 2 O 3 , TiB 2 and so on [18][19][20][21][22][23], the hardness of the Fe 3 Al alloys was significantly improved, as was the wear resistance. High wear resistance of particulate-reinforced Fe 3 Al metal matrix composites is attributed to the ceramic particle protecting the metal matrix from wear [23,24].…”

Section: Introductionmentioning

confidence: 86%

The Tribological Behaviour of Fe–28Al–5Cr/TiC Under Liquid Paraffine Lubrication

Zhang

Yang

et al. 2011

Tribol Lett

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The tribological behaviour of Fe-28Al-5Cr and its composites containing 15, 25 and 50 wt% TiC (corresponding to 19.3, 31.2 and 57.6 vol%), produced by hot-pressing process, was investigated under liquid paraffine lubrication against an AISI 52100 steel ball in ambient environment at varied applied loads and sliding speeds. It was found that the wear resistance increased and friction coefficient decreased with increasing of TiC content. The coefficients of friction are in the range of 0.09-0.14 at the given testing conditions. The wear rates of all the materials except the 50% composite are on the order of 10 -6 -10 -5 mm 3 m -1 , the wear rate for the 50% composite is too low to quantify under the two sliding conditions, (50 N, 0.04 m/s) and (100 N, 0.02 m/s). The wear rates of all the materials increase as applied load increases and the increasing extent diminishes with the increase of TiC content, but first increase slightly and then nearly remains steadiness with increasing sliding speed. The 50 wt% composite has wear resistance about 7-20 times better than pure Fe-28Al-5Cr at different sliding parameters. The enhanced wear resistance by TiC addition is attributed to the high hardness of the composites, as well as support of the oil lubrication film/layer by the hard TiC phase. The worn surfaces of all the materials are analyzed by a scanning electron microscope. The dominant wear mechanism of the Fe-28Al-5Cr and 15% composite is grooving and flaking-off, but those of the 25 and 50% composites are mainly shallow grooving.

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“…One family of alloys contained additions of Boron with transition metals that led to the formation of boride particles during casting and to some strengthening. [15] While showing excellent thermal stability, the boride particles were relatively coarse and led to only a small increase in the high temperature strength. Other alloys contained additions of transition metals, such as Mo, Ta, Ti, Zr, that formed interdendritic networks of complex intermetallics, such as Laves phases, during casting.…”

Section: Improvements Of Creep Strength Of Cast Materialsmentioning

confidence: 99%

Recent Developments Toward the Application of Iron Aluminides in Fossil Fuel Technologies

Morris¹,

Muñoz-Morris²

2010

Adv Eng Mater

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Iron aluminides are of interest for applications in power generation from fossil fuels because of excellent high temperature oxidation–corrosion resistance in aggressive environments and are potential replacements for high temperature steels. The Fe‐base composition ensures relative cheapness, while the high Al content leads to significant density reduction over commercial steels. Problems of low ductility/toughness at room temperature and poor high temperature (creep) strength, however, have prevented significant commercial use. After studies led by Oak Ridge National Laboratory (USA) from about 1980 to 2000, research has continued in Europe both as pan‐European efforts and as national efforts in countries such as the Czech Republic, France, Germany and Spain. An overview of such recent activities is presented, indicating the research strategies involved, and the progress toward making iron aluminides useful engineering materials. Recent activities have targeted microstructural refinement through novel processing to improve room temperature ductility or attempted alloying additions to improve high temperature strength. Achieving the required properties remains difficult, and has led to developments of iron aluminides as cast components and as coatings.

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Microstructure and mechanical properties of Fe3Al-based alloys with strengthening boride precipitates

Cited by 68 publications

References 39 publications

A Review on the Properties of Iron Aluminide Intermetallics

A Review on the Properties of Iron Aluminide Intermetallics

The Tribological Behaviour of Fe–28Al–5Cr/TiC Under Liquid Paraffine Lubrication

Recent Developments Toward the Application of Iron Aluminides in Fossil Fuel Technologies

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