Modeling of the Precipitation Evolution During Non-isothermal Heat Treatments in an Al Zn Mg Alloy

ABSTRACTThe atom probe field ion microscope has been used to characterize the morphology and determine the compositions of the iron-rich a and chromium-enriched α′ phases produced during isothermal and step cooled heat treatments in a Chromindur II ductile permanent magnet alloy. The good magnetic properties of this material are due to a combination of the composition of the two phases and the isolated nature and size of the ferromagnetic a phase. The morphology of the a phase is produced as a result of the shape of the miscibility gap and the step-cooled heat treatment and is distinctly different from that formed during isothermal heat treatments.

Download Full-text

Investigation of the effect of isothermal heat treatments on mechanical properties of thermo-mechanically rolled S700MC steel grade

Acta Metallurgica Slovaca ◽

10.36547/ams.26.1.449 ◽

2020 ◽

Vol 26 (1) ◽

pp. 11-16

Author(s):

Serkan Oktay ◽

Paolo Emilio Di Nunzio ◽

Mustafa Kelami Şeşen

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Impact Energy ◽

Heat Treatments ◽

Steel Grade ◽

Secondary Hardening ◽

Precipitation Kinetics ◽

High Supersaturation ◽

Bainitic Structure ◽

Isothermal Heat Treatments

The effect of isothermal heat treatments (1 hour at 200, 400, 600 and 800°C) on mechanical properties of thermo-mechanically rolled S700MC steel has been investigated by extensive mechanical characterizations. Treatments at 600°C increase yield and tensile strength and decrease impact energy. Below 600°C the steel retains its bainitic structure. Precipitation kinetics simulations indicate that this secondary hardening effect arises from the nucleation of fine (Nb,Ti)C particles, indicating that the bainitic structure is unstable above 600°C due to its high supersaturation with respect to C, Nb and Ti. These results can help to optimize the operating practices for post-weld heat treatments.

Download Full-text

A Multi-Mechanistic Model for Precipitation Strengthening in Al-Cu-Mg Alloys during Non-Isothermal Heat Treatments

Materials Science Forum - Aluminium Alloys 2006 ◽

10.4028/0-87849-408-1.277 ◽

2006 ◽

pp. 277-282

Author(s):

I.N. Khan ◽

Marco J. Starink

Keyword(s):

Mechanistic Model ◽

Heat Treatments ◽

Mg Alloys ◽

Precipitation Strengthening ◽

Isothermal Heat Treatments

Download Full-text

Effect of heat treatments on the microstructures and tensile properties of an ultrafine-grained Al-Zn-Mg alloy processed by ECAP

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2018.03.206 ◽

2018 ◽

Vol 749 ◽

pp. 567-574 ◽

Cited By ~ 11

Author(s):

Mohamed A. Afifi ◽

Ying Chun Wang ◽

Pedro Henrique R. Pereira ◽

Yi Huang ◽

Yangwei Wang ◽

...

Keyword(s):

Tensile Properties ◽

Heat Treatments ◽

Mg Alloy ◽

Ultrafine Grained

Download Full-text

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

Journal of Materials Research ◽

10.1557/jmr.2010.0164 ◽

2010 ◽

Vol 25 (7) ◽

pp. 1388-1397 ◽

Cited By ~ 6

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.

Download Full-text