Effect of Solution Heat Treatments on the Microstructure and Mechanical Properties of a Die-Cast AlSi7MgMn Alloy

Timelli, Giulio; Lohne, O.; Arnberg, L.; Laukli, Hans Ivar

doi:10.1007/s11661-008-9527-0

Cited by 49 publications

(25 citation statements)

References 31 publications

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“…However, Zang in the study [2] informs that the solutioning treatment for 30 minutes at 540 or 550 °C is sufficient to achieve more than 90% of the maximum yield strength and more than 95% of the maximum UTS, and the maximum average elongation to fracture. Similar results had been achieved in the studies [3][4][5].…”

Section: Introductionsupporting

confidence: 90%

Heat Treatment of a Casting Element of a Through Clamp to Suspension of Electric Cables on Line Post Insulators

Pezda¹

2016

Archives of Foundry Engineering

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Heat treatment of a casting elements poured from silumins belongs to technological processes aimed mainly at change of their mechanical properties in solid state, inducing predetermined structural changes, which are based on precipitation processes (structural strengthening of the material), being a derivative of temperature and duration of solutioning and ageing operations. The subject-matter of this paper is the issue concerning implementation of a heat treatment process, basing on selection of dispersion hardening parameters to assure improvement of technological quality in terms of mechanical properties of a clamping element of energy network suspension, poured from hypoeutectic silumin of the LM25 brand; performed on the basis of experimental research program with use of the ATD method, serving to determination of temperature range of solutioning and ageing treatments. The heat treatment performed in laboratory conditions on a component of energy network suspension has enabled increase of the tensile strength R m and the hardness HB with about 60-70% comparing to the casting without the heat treatment, when the casting was solutioned at temperature 520 o C for 1 hour and aged at temperature 165 o C during 3 hours.

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Section: Introductionsupporting

confidence: 90%

Heat Treatment of a Casting Element of a Through Clamp to Suspension of Electric Cables on Line Post Insulators

Pezda¹

2016

Archives of Foundry Engineering

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“…In particular, the material softening is larger in the earlier stage of the treatment, then the hardness slightly improves by prolonging the holding time and finally maintains at a steady value after 3 h. Similar behaviour was found for a thixocast 319 alloy solutioned at 500 °C [29]. The initial softening of the alloy may be due to the eutectic Si particles coarsening, which is characterized by the increase of the inter-particle distance of the eutectic Si [30]; on the other side, the subsequent strengthening can be associated with the increasing content of Cu, Mg and Si in solid solution. The hardness evolution approaches the as-rheocast value, and it stabilizes after 4 h, indicating how the α-Al matrix is saturated.…”

Section: As-quenched Conditionsupporting

confidence: 67%

Effect of T6 Heat Treatment on the Microstructure and Hardness of Secondary AlSi9Cu3(Fe) Alloys Produced by Semi-Solid SEED Process

Fabrizi

Capuzzi

Mori

et al. 2018

Metals

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The effect of the T6 heat treatment on the microstructure and hardness of a secondary semi-solid AlSi9Cu3(Fe) alloy have been investigated by using optical, scanning and transmission electron microscopy and hardness testing. The semi-solid alloy was produced using the swirled enthalpy equilibration device (SEED). The solution heat treatments were performed at 450, 470 and 490 °C for 1 to 6 h followed by water quenching and artificial ageing at 160, 180 and 220 °C for holding times ranging from 1 to 30 h. The microstructural investigations have revealed the spheroidization of the eutectic Si and the dissolution of the majority of Cu-rich compounds after all the solution heat treatments; moreover, the greater the solution temperature and time, the higher the hardness of the alloy. Unacceptable surface blistering has been observed for severe solution condition, 490 °C for 3 and 6 h. The artificial ageing at 160 °C for 24 h has led to the highest alloy strengthening thanks to the precipitation of β” and Q’ (or L) phases within the α-Al matrix. The hardening peaks at higher temperatures have been early achieved due to faster hardening kinetic; however, the lower number density of β” and Q’ (or L) phases and the presence of coarser θ’ precipitates result in a reduction of hardness values for peak aged condition at 180 and 220 °C, respectively.

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“…The mechanical behavior of Al foundry alloys can also be estimated by means of the reference die ( Figure 4 a) designed, built and tested by HYDRO in cooperation with NTNU (University of Science and Technology, Trondheim, Norway). The dimensions of the cylindrical tensile test specimens are shown in Figure 4 b [ 14 ]. Some previous works [ 15 , 16 ] demonstrated that the tensile specimens show higher porosity in the grip section as compared to the gauge section.…”

Section: Reference Castings For Testing Tensile Behaviormentioning

confidence: 99%

Evaluating the Tensile Properties of Aluminum Foundry Alloys through Reference Castings—A Review

Anilchandra¹,

Arnberg

Bonollo

et al. 2017

Materials

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The tensile properties of an alloy can be exploited if detrimental defects and imperfections of the casting are minimized and the microstructural characteristics are optimized through several strategies that involve die design, process management and metal treatments. This paper presents an analysis and comparison of the salient characteristics of the reference dies proposed in the literature, both in the field of pressure and gravity die-casting. The specimens produced with these reference dies, called separately poured specimens, are effective tools for the evaluation and comparison of the tensile and physical behaviors of Al-Si casting alloys. Some of the findings of the present paper have been recently developed in the frame of the European StaCast project whose results are complemented here with some more recent outcomes and a comprehensive analysis and discussion.

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Effect of Solution Heat Treatments on the Microstructure and Mechanical Properties of a Die-Cast AlSi7MgMn Alloy

Cited by 49 publications

References 31 publications

Heat Treatment of a Casting Element of a Through Clamp to Suspension of Electric Cables on Line Post Insulators

Heat Treatment of a Casting Element of a Through Clamp to Suspension of Electric Cables on Line Post Insulators

Effect of T6 Heat Treatment on the Microstructure and Hardness of Secondary AlSi9Cu3(Fe) Alloys Produced by Semi-Solid SEED Process

Evaluating the Tensile Properties of Aluminum Foundry Alloys through Reference Castings—A Review

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