Effect of heat treatment on microstructure and wear behavior of Al–Si alloys with various iron contents

Eshaghi, Akbar; Ghasemi, H.M.; Rassizadehghani, J.

doi:10.1016/j.matdes.2010.10.014

Cited by 28 publications

(14 citation statements)

References 13 publications

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“…13 (b); which is also studied in details and reported in the literature [27]. Presence of cracks and fragmentation of the beta phase has also been observed by the other researchers in Al-12 wt% Si alloy [28] and Al-9 wt% Si alloy [29] when heat treatment below eutectic temperature was carried out. Such cracks provide additional highenergy surface area through which atomic diffusion could take place and eventually the platelets would appear in fragmented-yet-aligned morphology in the microstructure, as shown in fig.…”

Section: Mechanism Of Morphological Changesupporting

confidence: 53%

Morphological changes and segregation of β-Al 9 Fe 2 Si 2 phase: A perspective from better recyclability of cast Al-Si alloys

Basak

Babu

2016

Materials & Design

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High iron impurity has detrimental effects on the castability and tensile properties of recycled aluminium alloys. The present study reports the engineering of intermetallic β-phase present in hypoeutectic cast Al-Si model alloy systems with high Fe content (2wt% Fe) in order to demonstrate the promising recyclability despite having high Fe content. Thermodynamic interplay between Si and Fe concentration on the formation of the β-phase and the solidification behaviour of the hypoeutectic Al-Si alloys has been explored. It has been demonstrated that with suitable heat treatment it is possible to alter the morphology of the β-phase and based on the experimental evidences, for the first time, the mechanism behind the solid-state morphological changes of beta phase has been proposed. Based on the experimental results and thermodynamic calculations it has been suggested that elimination of beta phase by gravitational segregation is more suitable for the near-eutectic 10wt% Si alloy; whereas for 6wt%Si alloy, morphological change of β-phase is recommended. It was also found that morphological change of beta-phase and Si could help recovering the strength and ductility in the recycled Al-Si alloys having high Fe content.

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Section: Mechanism Of Morphological Changesupporting

confidence: 53%

Morphological changes and segregation of β-Al 9 Fe 2 Si 2 phase: A perspective from better recyclability of cast Al-Si alloys

Basak

Babu

2016

Materials & Design

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“…4) Furthermore, the fragmentation and coarsening of the Fe intermetallic compound incorporated with spheroidized Si can improve the wear resistance by a heat treatment. 5) Recently, severe plastic deformation by caliber rolling (CAROL) has been studied for various materials to produce ultrafine grain structures with good toughness improvement and refinement of intermetallic compounds. Mukai et al.…”

Section: Introductionmentioning

confidence: 99%

Caliber Rolling Process and Mechanical Properties of High Fe-Containing Al–Mg–Si Alloys

et al. 2012

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Fe-intermetallic compounds are commonly detrimental for mechanical properties and formability of aluminum alloys. In this study, the refinement of Fe-intermetallic compounds and mechanical properties in high Fe-containing AlMgSi alloys were studied by caliber rolling. The Al(2.22.3) mass%Si0.9 mass%Mg(1, 1.5 and 2) mass%Fe alloys were severely deformed by the multi-pass caliber rolling at 573 and 723 K. Fe-intermetallic compounds were finely fragmented with the smallest size of around 200 nm. The morphologies of fragmented Fe compounds in the Al matrix depend on the as-cast microstructure and deformation behavior with better distribution in the outer area than in the center area. Good ultimate strength of 345360 MPa and high elongation of 1525% were achieved after 95% caliber rolling.

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“…예를 들어, 강의 구조는 냉각 속도에 달라질 수 있으며, 특히 마이크로 구조를 형성할 경우, 강도와 연성을 모두 증가시킬 수 있다는 결 과가 제시되고 있다 [12]. 그러나, 열처리 공정에 관 한 대부분의 연구는 공정 개발 및 소재 자체의 물 성 분석 등에 주로 치우쳐 있으며, 시스템적 특성 인 마찰 및 마모 관점에서의 연구 [13][14][15] …”

Section: 서 론unclassified

Surface and Tribological Characteristics of Air-cooled and Oil-cooled AISI 4140 Steel

Cho¹,

Son²,

Chung³

2016

Journal of the Korean Society of Tribologists and Lubrication E

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− AISI 4140 steel is widely used in various mechanical components owing to its superior mechanical properties. Surface hardening techniques are often used to further improve the properties, particularly for applications with moving components. The aim of this research is to understand the effect of heat treatment process on surface properties and tribological characteristics of AISI 4140 steel. In this work, we prepare two different AISI 4140 steel specimens-one cooled by air and one by oil-and determine surface properties such as surface topography and roughness using a confocal microscope. We also observe the cross-sections of the specimens using a scanning electron microscope to understand the difference in the material structure. In addition, we assess the hardness with respect to the distance from the surface using a micro-Vickers hardness tester. After characterizing the surfaces of the specimens, we investigate the wear characteristics of the specimens under hydrodynamic lubrication. The results show the presence of grooves on the surface of the oil-cooled specimens. It is likely that such grooves are formed during the cooling process using the oil. However, we observe no other significant differences in the surface properties of the specimens. The wear test results show the occurrence of severe wear on the oil-cooled specimens, which may be due to the groove formed on the surface. The results of this work may be helpful to improve surface properties using surface hardening techniques from a tribological perspective.

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Effect of heat treatment on microstructure and wear behavior of Al–Si alloys with various iron contents

Cited by 28 publications

References 13 publications

Morphological changes and segregation of β-Al 9 Fe 2 Si 2 phase: A perspective from better recyclability of cast Al-Si alloys

Morphological changes and segregation of β-Al 9 Fe 2 Si 2 phase: A perspective from better recyclability of cast Al-Si alloys

Caliber Rolling Process and Mechanical Properties of High Fe-Containing Al–Mg–Si Alloys

Surface and Tribological Characteristics of Air-cooled and Oil-cooled AISI 4140 Steel

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Effect of heat treatment on microstructure and wear behavior of Al–Si alloys with various iron contents

Cited by 28 publications

References 13 publications

Morphological changes and segregation of β-Al 9 Fe 2 Si 2 phase: A perspective from better recyclability of cast Al-Si alloys

Morphological changes and segregation of β-Al 9 Fe 2 Si 2 phase: A perspective from better recyclability of cast Al-Si alloys

Caliber Rolling Process and Mechanical Properties of High Fe-Containing Al&ndash;Mg&ndash;Si Alloys

Surface and Tribological Characteristics of Air-cooled and Oil-cooled AISI 4140 Steel

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Caliber Rolling Process and Mechanical Properties of High Fe-Containing Al–Mg–Si Alloys