Principles of Microstructural Formation in Semi-Solid Metal Processing

Flemings, M.C.; Martinez, R. A.

doi:10.4028/3-908451-26-4.1

Cited by 23 publications

(25 citation statements)

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“…Fig. 1(b) shows the optical micrograph of the as-cast Al-4.5Cu-5TiB 2 composite, revealing a rosette-like [29] irregular grain structure with dendritic character. Image analysis with optical microscopy shows the average grain size to be 50 m. Both optical ( Fig.…”

Section: Microstructure and Hardnessmentioning

confidence: 97%

Wear behaviour of cast and mushy state rolled Al–4.5Cu alloy and in-situ Al4.5Cu–5TiB2 composite

Herbert

Maiti

Mitra

et al. 2008

Wear

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Section: Microstructure and Hardnessmentioning

confidence: 97%

Wear behaviour of cast and mushy state rolled Al–4.5Cu alloy and in-situ Al4.5Cu–5TiB2 composite

Herbert

Maiti

Mitra

et al. 2008

Wear

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“…Semi-solid metal (SSM) processing is a unique manufacturing method to produce near-net shape products for various industrial applications [1]. With this method, a globular microstructure is obtained in contrast with conventional liquid casting, where a dendritic microstructure is attained.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the T4 and T6 Heat Treatment Cycles of Semi-Solid Processed Aluminium Alloy A356

Möller¹,

Govender²,

Stumpf³

2008

TOMSJ

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The heat treatment cycles that are currently applied to semi-solid processed components are mostly those that are in use for dendritic casting alloys. These heat treatments are not necessarily the optimum treatments. It is shown that a decrease of the solution treatment time at 540 o C from 6 hours to 1 hour does not alter the T4 or T6 tensile properties of the SSM processed A356 alloy. Slightly better impact properties are obtained with the shorter solution treatment. This could lead to time and energy savings. Natural aging prior to artificial aging causes the time-to-peak-hardness to be longer compared to the time when only artificial aging is used. Quenching after solution treatment in water at 70 o C results in slightly lower tensile properties than after quenching in water at 25 o C. The magnesium content of alloy A356 has a significant influence on the T4 and T6 properties of the alloy.

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“…Under such condition, the strength of the liquid films between the primary dendrites was lower than that of the dendritic matrix [26]. If the stress induced by solidification shrinkage, thermal contraction, or external deformation were large enough to overcome the strength of the liquid film, internal or open hot tears would result in these semi-solid regions [27]. Cai et al [28] used the synchrotron tomographic quantification method to realize the in-situ observation of the hot tearing during the semi-solid compression (with~25% F L ) of Al-Cu alloy.…”

Section: Effects Of Ldp On Dendrite Structurementioning

confidence: 99%

A Method Based on Semi-Solid Forming for Eliminating Coarse Dendrites and Shrinkage Porosity of H13 Tool Steel

Guo

Liu

Sun

et al. 2018

Metals

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A method called forging solidifying metal (FSM), which is applied for eliminating coarse dendrites and shrinkage porosity defects of ferrous alloys was proposed based on semi-solid forming technology (SSF). To verify its feasibility, the effects of liquid fraction (F L) on the microstructure of the deformed H13 steel were investigated experimentally. The coarse dendrites structure still existed and cracks appeared when the 0.1/s 50% FSM method was carried out at~20% F L. What is significantly different from that is, the elimination of the coarse dendrites structure and shrinkage porosity defects became more significant, when this method was conducted at the end of solidification (F L < 10%). The microstructure of H13 steel was significantly refined and also became dense in such condition.

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Principles of Microstructural Formation in Semi-Solid Metal Processing

Cited by 23 publications

References 0 publications

Wear behaviour of cast and mushy state rolled Al–4.5Cu alloy and in-situ Al4.5Cu–5TiB2 composite

Wear behaviour of cast and mushy state rolled Al–4.5Cu alloy and in-situ Al4.5Cu–5TiB2 composite

Investigation of the T4 and T6 Heat Treatment Cycles of Semi-Solid Processed Aluminium Alloy A356

A Method Based on Semi-Solid Forming for Eliminating Coarse Dendrites and Shrinkage Porosity of H13 Tool Steel

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