Microstructure and mechanical properties of hot rolled Fe–40 at-%Al intermetallic alloys with Zr and B addition

Haušild, Petr; Karlı́k, Miroslav; Šı́ma, V.; Alexander, Duncan T. L.

doi:10.1179/026708310x12738371693012

Cited by 6 publications

(4 citation statements)

References 22 publications

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“…Increase of boron content changed the fracture mode from intergranular decohesion to cleavage, which correlates with significant increases in the fracture toughness. Boron was also found to increase the grain boundary strength and modify the formation of the second phase particles [12,13].…”

Section: Introductionmentioning

confidence: 97%

Homogenization of Microstructure of Castings from the Alloy Fe-40at.%Al-Zr-B

Schindler

Rusz

Kawulok

et al. 2014

MSF

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The samples intended for the study of static recrystallization on plastometer Gleeble were prepared from the laboratory castings of iron aluminide containing 24.6 Al 0.17 Mn 0.16 Zr 0.026 B 0.004 C (in wt. %, remainder Fe). Nevertheless, the structure analysis discovered that the results were excessively influenced by the huge heterogeneity of the as-cast microstructure, mostly of the grain size. Combination of the hot forming and recrystallization process during the long-term high-temperature annealing was selected for the necessary structure homogenization. As the tested intermetallic alloy is extremely brittle and susceptible to surface cracking, the original method was applied for its processing. The method consists in hot rolling in the protective capsules welded from the ferritic stainless steel sheet. The castings were rolled to 2/3 of their thickness by 4 reductions with the inter-stage heating, and then annealed at the temperature of 1200 °C in the vacuum furnace for several periods. Metallographic analysis revealed that annealing lasting 7 hours was essential for the uniform coarsening of the recrystallized grains. Material processed in this way proved successful for the subsequent metallographical study of static recrystallization.

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Section: Introductionmentioning

confidence: 97%

Homogenization of Microstructure of Castings from the Alloy Fe-40at.%Al-Zr-B

Schindler

Rusz

Kawulok

et al. 2014

MSF

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“…Therefore, the carbon-free alloys started to be developed, being alloyed by many alloying elements, such as chromium, niobium, or zirconium [17][18][19]. Boron was found to improve the fracture toughness of these alloys [20].…”

Section: Introductionmentioning

confidence: 99%

Novel High-Entropy Aluminide-Silicide Alloy

Novák

Nová

2021

Materials

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Novel high-entropy (multi-principal elements) alloy based on Fe-Al-Si-Ni-Ti in equimolar proportions has been developed. The alloy powder obtained by mechanical alloying is composed of orthorhombic FeTiSi phase with the admixture of B2 FeAl. During spark plasma sintering of this powder, the FeSi phase is formed and the amount of FeAl phase increases at the expense of the FeTiSi phase. The material is characterized by a high compressive strength (approx. 1500 MPa) at room temperature, being brittle. At 800 °C, the alloy is plastically deformable, having a yield strength of 459 MPa. The wear resistance of the material is very good, comparable to the tool steel. During the wear test, the spallation of the FeSi particles from the wear track was observed locally.

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“…Increase of boron content changed the fracture mode from intergranular decohesion to cleavage, which correlates with significant increases in the fracture toughness. boron was also found to increase grain boundary strength and modify the formation of the second phase particles [6,7].…”

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confidence: 96%

Optimization Of Laboratory Hot Rolling Of Brittle Fe-40at.%Al-Zr-B Aluminide

Schindler

Hadasik

Kopeček

et al. 2015

Archives of Metallurgy and Materials

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Use of the protective steel capsules enabled to manage the laboratory hot flat rolling of the extremely brittle as-cast aluminide Fe-40at.%Al-Zr-B with the total height reduction of almost 70 %. The hot rolling parameters were optimized to obtain the best combination of deformation temperature (from 1160°C up to 1240°C) and rolling speed (from 0.14 m·s−1 to 0.53 m·s−1). The resistance against cracking and refinement of the highly heterogeneous cast microstructure were the main criteria. Both experiments and mathematical simulations based on FEM demonstrated that it is not possible to exploit enhanced plasticity of the investigated alloy at low strain rates in the hot rolling process. The heat flux from the sample to the working rolls is so intensive at low rolling speed that even the protective capsule does not prevent massive appearance of the surface transverse cracking. The homogeneity and size of product’s grain was influenced significantly by temperature of deformation, whereas the effect of rolling speed was relatively negligible. The optimal forming parameters were found as rolling temperature 1200°C and the rolling speed 0.35 m·s−1. The effective technology of the iron aluminide Fe-40at.% Al-Zr-B preparation by simple processes of melting, casting and hot rolling was thus established and optimized.

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Microstructure and mechanical properties of hot rolled Fe–40 at-%Al intermetallic alloys with Zr and B addition

Cited by 6 publications

References 22 publications

Homogenization of Microstructure of Castings from the Alloy Fe-40at.%Al-Zr-B

Homogenization of Microstructure of Castings from the Alloy Fe-40at.%Al-Zr-B

Novel High-Entropy Aluminide-Silicide Alloy

Optimization Of Laboratory Hot Rolling Of Brittle Fe-40at.%Al-Zr-B Aluminide

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