Effect of cooling rate on precipitation during homogenization cooling in an excess silicon AlMgSi alloy

Birol, Yücel

doi:10.1016/j.matchar.2012.07.015

Cited by 32 publications

(19 citation statements)

References 20 publications

(23 reference statements)

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“…The Al (FeMnCr) Si phases were in agreement with the SEM and EDS analysis results. The Mg 2 Si and Mg 5 Si 6 were the strengthen phases that formed during the aging process [4,17,18]. And this matches the result of hardness (Figure 4) and the tensile strength discussed in the next section.…”

Section: Hardness Values and Microstructural Observationsupporting

confidence: 84%

Enhancement of the Young’s Modulus through Infrared Heat Treatment: A Study of the Microstructure and the Mass Effect of Real Body 6082 Aluminum Forgings

Chang

Hung

Lui

2018

Metals

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To avoid the phenomenon of abnormal grain coarsening, and increase the Young's modulus of forgings, an infrared heat treatment was used on different mass forgings and compared with the results of an air furnace heat treatment. This work focused on the effects of microstructural evolution and the mechanical properties of two different mass 6082 real forgings. The experimental results show that infrared heat treatment can effectively reduce the mass effect after heat treatment, inhibit the coarse grains formed, and keep the non-equiaxed grains along the metal flows, thus significantly improving the ductility of the material. In addition, the rapid heating characteristic of infrared can effectively shorten the duration of heat treatment and greatly enhance the Young's modulus and the vibration resistance of 6082 entity forgings.

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Section: Hardness Values and Microstructural Observationsupporting

confidence: 84%

Enhancement of the Young’s Modulus through Infrared Heat Treatment: A Study of the Microstructure and the Mass Effect of Real Body 6082 Aluminum Forgings

Chang

Hung

Lui

2018

Metals

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“…[116]. To identify these overlapping microstructural reactions, a relatively large body of work is available, e.g., [23,116,118,128,138,[170][171][172][173]. Figure 35 illustrates the authors' own work on quench-induced precipitation in 6005A at different cooling rates, showing optical micrographs (A), SEM secondary electron images (B) and TEM bright-field images (C) after cooling from solution treatment to the ambient temperature at different rates.…”

Section: XXX Almgsi Wrought Alloysmentioning

confidence: 99%

Review of the Quench Sensitivity of Aluminium Alloys: Analysis of the Kinetics and Nature of Quench-Induced Precipitation

et al. 2019

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For aluminium alloys, precipitation strengthening is controlled by age-hardening heat treatments, including solution treatment, quenching, and ageing. In terms of technological applications, quenching is considered a critical step, because detrimental quench-induced precipitation must be avoided to exploit the full age-hardening potential of the alloy. The alloy therefore needs to be quenched faster than a critical cooling rate, but slow enough to avoid undesired distortion and residual stresses. These contrary requirements for quenching can only be aligned based on detailed knowledge of the kinetics of quench-induced precipitation. Until the beginning of the 21st century, the kinetics of relevant solid-solid phase transformations in aluminium alloys could only be estimated by ex-situ testing of different properties. Over the past ten years, significant progress has been achieved in this field of materials science, enabled by the development of highly sensitive differential scanning calorimetry (DSC) techniques. This review presents a comprehensive report on the solid-solid phase transformation kinetics in Al alloys covering precipitation and dissolution reactions during heating from different initial states, dissolution during solution annealing and to a vast extent quench-induced precipitation during continuous cooling over a dynamic cooling rate range of ten orders of magnitude. The kinetic analyses are complemented by sophisticated micro- and nano-structural analyses and continuous cooling precipitation (CCP) diagrams are derived. The measurement of enthalpies released by quench-induced precipitation as a function of the cooling rate also enables predictions of the quench sensitivities of Al alloys using physically-based models. Various alloys are compared, and general aspects of quench-induced precipitation in Al alloys are derived.

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“…In situ methods allowed direct observations of grain size variations without altering the test conditions, and they were successfully used in the characterization of microstructure evolutions of steels for the past few years. Bulk methods such as ultrasonic techniques [ 12 , 13 ] and the differential scanning calorimeter method [ 14 , 15 ] achieved fast and in situ grain size determinations with a few experiments, but the grain growths were not directly observed, and they should not be used independent of metallographic observations [ 16 ]. As a surface characterization method, the in situ observations [ 17 ] have gained much attention due to its directness, and it has been adopted in the researches of solidification [ 18 ], phase transformation [ 16 ], and the grain growth [ 1 ] of steels recently.…”

Section: Introductionmentioning

confidence: 99%

In Situ Investigation of Grain Evolution of 300M Steel in Isothermal Holding Process

Chen

Zheng

et al. 2018

Materials

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The relationships between initial microstructures, process parameters, and grain evolutions in isothermal holdings have drawn wide attention in recent years, but the grain growth behaviors of 300M steel were not well understood, resulting in a failure in precise microstructure controlling in heat treatment. In this work, in situ observations were carried out to characterize the grain evolutions of 300M steel with varying holding time, holding temperatures, and initial microstructures. The intriguing finding was that the grain refinement by austenization of 300M steel was followed by a dramatic grain growth in the initial stage of holding (≤~600 s), and with increasing time (~600–7200 s), the average grain size appeared to have a limit value at specific temperatures. The austenization process accelerated the grain growth by generating large quantity of grain boundaries at the initial stage of holdings, and the growth rate gradually slowed down after holding for ~600 s because the driven force was weakened due to the reduction of grain boundary energy. The initial structure and the initial grain size of 300M steel had no obvious influences on the grain size evolutions. The mechanisms of grain growth were analyzed based on in situ observations and transmission electron microscope (TEM) characterizations. A grain evolution model considering the grain boundary migration of 300M steel was established for the isothermal holding process. Good agreement was obtained between the in situ observation results and the model calculation results. This investigation aimed to understand fundamentally the grain evolutions of 300M steel in the isothermal holding process.

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Effect of cooling rate on precipitation during homogenization cooling in an excess silicon AlMgSi alloy

Cited by 32 publications

References 20 publications

Enhancement of the Young’s Modulus through Infrared Heat Treatment: A Study of the Microstructure and the Mass Effect of Real Body 6082 Aluminum Forgings

Enhancement of the Young’s Modulus through Infrared Heat Treatment: A Study of the Microstructure and the Mass Effect of Real Body 6082 Aluminum Forgings

Review of the Quench Sensitivity of Aluminium Alloys: Analysis of the Kinetics and Nature of Quench-Induced Precipitation

In Situ Investigation of Grain Evolution of 300M Steel in Isothermal Holding Process

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