Microstructure and Properties of Al-Mg-Si Wire-Rod Subjected to Continuous Heat Treatment

2014 ◽  
Vol 794-796 ◽  
pp. 1217-1220
Author(s):  
Piotr Osuch ◽  
Monika Walkowicz ◽  
Beata Smyrak ◽  
Tadeusz Knych
Keyword(s):  
Heat Treatment ◽  
Continuous Casting ◽  
Rolling Process ◽  
Artificial Ageing ◽  
Microstructure And Properties ◽  
Wire Rod ◽  
Continuous Heat Treatment ◽  
Overhead Power Lines ◽  
6Xxx Series ◽  
Continuous Heat

Among multiple applications 6XXX-series aluminum alloys are widely used as electrical conductor for overhead power lines. For that application Al-Mg-Si alloys are produced mainly in the form of wire rod in the continuous casting and rolling lines (CCR). There is many technological routes possible to transform the Al-Mg-Si wire-rod into precipitation hardened, ready to use Al-Mg-Si wires. One of these routes involves using the heat of continuous casting and rolling process to artificial ageing of wire-rod, which is motivated by ecological premise. In the current paper the results of continuous heat treatment of the wire-rod within the CCR line (involving quenching of the alloy to artificial ageing temperature) on the microstructure and properties has been examined. It was shown the structure of wire rod formed in such process is very irregular. TEM investigations has shown that many heterogeneous particles are present and the arrangement of the β main hardening phase is very inhomogeneous with wide precipitate free zones occurred. However this type of microstructure has a positive effect on electrical properties of the material in question, which is important taking into consideration application of the alloy.

Effect of Precipitation Hardening on the Structure and Properties of Al-Mg-Si Conductor Alloys in Different Technological Routes

2013 ◽  
Vol 765 ◽  
pp. 823-826
Author(s):  
Piotr Osuch ◽  
Beata Smyrak ◽  
Tadeusz Knych
Keyword(s):  
Heat Treatment ◽  
Continuous Casting ◽  
Production Process ◽  
Precipitation Hardening ◽  
Rolling Process ◽  
Wire Drawing ◽  
Natural Ageing ◽  
Wire Rod ◽  
The Wire ◽  
Technological Route

The Al-Mg-Si alloys, due to their unique combination of lightweight, mechanical and electrical properties and excellent corrosion resistance, are used as a material for the production of overhead power conductors, commonly known as AAAC (All Aluminium Alloy Conductor). Wires intended for conductor manufacturing are obtained from the wire rod produced by a continuous casting and rolling line (CCR, e.g., Continuus-Properzi). The Al-Mg-Si wire rod can be processed into ready-made wires by different technological routes, which mainly consist of different combinations of strain hardening as well as precipitation hardening of wire rod or wires. In Europe the conventional technological route comprises solution heat treatment of wire rod coils (heated at temperatures over ~500 °C, followed by quenching into water), then natural ageing of wire rod at ambient temperature for a couple of days, next wire drawing, and finally artificial ageing.This paper discusses results of investigations on developing an alternative technological route. In this process heat from the continuous casting and rolling process by Continuus-Properzi is used for heat treatment of the wire rod. The new technological route allows the abandonment of the high temperature heat treatment as well as natural ageing of the wire rod, making the production process less energy consuming, cheaper and faster than the conventional one. The current paper presents research results identifying the structure of materials from different Al-Mg-Si wires production process routes. It also focuses on electrical and mechanical properties.

scholarly journals Martensitic Transformation of a High-speed Tool Steel During Continuous Heat Treatment

2015 ◽  
Vol 2 ◽  
pp. S635-S638 ◽  
Author(s):  
S. Sackl ◽  
G. Kellezi ◽  
H. Leitner ◽  
H. Clemens ◽  
S. Primig
Keyword(s):  
Heat Treatment ◽  
Martensitic Transformation ◽  
Tool Steel ◽  
High Speed ◽  
Continuous Heat Treatment ◽  
Continuous Heat

Correlation between microstructural evolution during high-pressure torsion and isothermal heat treatment of amorphous Al85Gd8Ni5Co2 alloy

2010 ◽  
Vol 25 (7) ◽  
pp. 1388-1397 ◽  
Author(s):  
Péter Henits ◽  
Ádám Révész ◽  
Erhard Schafler ◽  
Péter J. Szabó ◽  
János L. Lábár ◽  
...  
Keyword(s):  
Heat Treatment ◽  
High Pressure ◽  
High Pressure Torsion ◽  
Thermal Sensitivity ◽  
Heat Treatments ◽  
Isothermal Heat Treatment ◽  
X Ray Diffraction ◽  
Continuous Heat Treatment ◽  
Isothermal Heat Treatments ◽  
Continuous Heat

Al85Gd8Ni5Co2 metallic glass was subjected to partial devitrification by high-pressure torsion, continuous heat treatment, and isothermal annealing. The fully amorphous alloy exhibits a well-defined transition in its first devitrification product during isothermal heat treatments from τm + α-Al phase mixture to primary α-Al by increasing the annealing temperature above 555 K. This thermal sensitivity predestinates the composition to identify the controversial thermal contribution of the plastic deformation in metallic glasses. Thermal stability and structure of the partially devitrified samples were systematically analyzed and compared by calorimetry, x-ray diffraction, and electron microscopy. It seems that the effect of severe deformation cannot be singled out by a simple isothermal heat treatment; i.e., high-pressure torsion acts as a spectrum of heat treatments performed at different annealing temperatures.

Collapse-Type Shrinkage’s Characteristics in Both Eucalyptus urophylla and E.cloeziana Wood under Heat-Treatment Conditions

2010 ◽  
Vol 297-301 ◽  
pp. 1016-1021
Author(s):  
Yi Qiang Wu ◽  
Kazuo Hayashi ◽  
Ying Chun Cai
Keyword(s):  
Heat Treatment ◽  
Eucalyptus Urophylla ◽  
Permanent Set ◽  
Treatment Conditions ◽  
Shrinkage Process ◽  
Continuous Heat Treatment ◽  
The Difference ◽  
Heat Treatment Regimes ◽  
Increasing Temperature ◽  
Continuous Heat

In order to explore the formation process of collapse-type shrinkage of eucalypt wood, the collapse-shrinkage properties in Eucalyptus urophylla and E.cloeziana wood under different heat-treatment conditions were systematically investigated by using frozen drying, and simultaneously creative assessments on their collapse-type shrinkage process were conducted based on the novel concepts of both transient collapse and maximum transient collapse advanced for the first time. The results indicated that, for lower-density E.urophylla, total shrinkage and residual collapse under both heat-treatment regimes increased with increasing temperature. As compared to intermittent heat treatment, the above two indices at three levels of temperatures in continuous heat treatment displayed relatively larger values, and exhibited down-open-parabola type; For higher-density E.cloeziana, only higher collapse phenomenon in the part near to the pith were observed, and similar to E.urophylla, while almost slight and /or no collapse occurs in the middle heartwood and sapwood, and shrinkage and collapse in continuous heat treatment is slightly larger than those in intermittent heat treatment, and both shrinkage and collapse take on up-open-parabola type. Trends of radial variation of both parameters for both species in continuous heat treatment were consistent with those in intermittent heat treatment. It can be speculated that the mechanism of the difference in collapse-type shrinkage characteristics between two heat-treatment patterns are that the more types of cells and the more number of cells participated in the collapse development, and the more transient collapse, especially maximum transient collapse, is transformed into the permanent set to develop the residual collapse for continuous heat treatment than the intermittent heat treatment. Therefore, it is very crucial for lower-density susceptible-collapse eucalypt to manage to prevent maximum transient collapse from being transformed into permanent set in the process of drying.

Sign in / Sign up

Export Citation Format

Share Document