Sintering of powders in the Al2O3-ZrO2-Y2O3 system obtained by the method of rapid solidification of the melt as a function of the initial heat treatment

1998 ◽  
Vol 39 (7-8) ◽  
pp. 237-238
Author(s):  
V. A. Kryuchkov ◽  
A. V. Galakhov
Keyword(s):  
Heat Treatment ◽  
Rapid Solidification ◽  
Initial Heat ◽  
Initial Heat Treatment

Degradation of Mechanical and Structural Properties of Steel T23

2007 ◽  
Vol 567-568 ◽  
pp. 389-392 ◽  
Author(s):  
Marie Svobodová ◽  
Jindřich Douda ◽  
Jiří Kudrman
Keyword(s):  
Heat Treatment ◽  
Structural Properties ◽  
High Temperatures ◽  
Base Material ◽  
Experimental Results ◽  
Air Atmosphere ◽  
Mechanical And Structural Properties ◽  
Long Time ◽  
Initial Heat ◽  
Initial Heat Treatment

This paper deals with changes in mechanical and structural properties of Steel T23 during long-time annealing at high temperatures. The research is focused on the degradation of the base material (steel T23), where the samples of steel, after the initial heat treatment, were annealed at temperatures of 600, 650 and 700 °C for 10 to 10 000 hours in a furnace with air atmosphere. This contribution summarizes the experimental results of mechanical and structural measurements and gives the relations between them.

The Effect of Heat Treatment on the Microstructure and Properties of FeAl+Cr

1996 ◽  
Vol 460 ◽  
Author(s):  
P. R. Munroe ◽  
C. H. Kong
Keyword(s):  
Heat Treatment ◽  
Growth Mechanism ◽  
Isothermal Annealing ◽  
Prolonged Annealing ◽  
Heat Treated ◽  
Ledge Growth ◽  
Initial Drop ◽  
Microstructural Studies ◽  
Initial Heat ◽  
Initial Heat Treatment

ABSTRACTMicrostructural studies were performed on an alloy of composition Fe45Cr5Al50 heat treated at 950°C and oil-quenched and then given isothermal annealing treatments for times up to 200 hours at either 400°C or 500°C. The observed microstructures were correlated with variations in hardness during isothermal annealing. It was deduced that the thermal vacancies retained following the initial heat treatment are removed relatively rapidly from the lattice, which leads to an initial drop in hardness. However, during prolonged annealing, the coarsening of bothFeAl2 particles and a disordered a(Fe,Cr) phase leads to further softening. It was also deduced that the chromium atoms, which remain in solution, are effective solute strengtheners. The a(Fe,Cr) phase, which is coherent with the B2 matrix, appears to coarsen by a ledge growth mechanism.

Influence of Initial Heat Treatment on the Microhardness Evolution of an Al-Mg-Sc Alloy Processed by High-Pressure Torsion

2016 ◽  
Vol 879 ◽  
pp. 1471-1476 ◽  
Author(s):  
Pedro Henrique R. Pereira ◽  
Yi Huang ◽  
Terence G. Langdon
Keyword(s):  
Heat Treatment ◽  
High Pressure ◽  
High Pressure Torsion ◽  
Solution Treatment ◽  
Equivalent Strain ◽  
Microhardness Distribution ◽  
Solution Treated ◽  
Mg Content ◽  
Initial Heat ◽  
Initial Heat Treatment

An Al-3% Mg-0.2% Sc alloy was subjected to annealing or solution treatment and further processed by HPT at room temperature. Microhardness measurements were taken along the middle-sections of the discs and they demonstrated that a very substantial hardening is achieved during HPT processing regardless of the initial heat treatment. Hardness values of ~200 Hv were recorded at the edge of the samples although the microhardness distribution remained inhomogeneous along the diameters of the discs after 20 turns of high-pressure torsion. In addition, the microhardness of the solution treated Al-Mg-Sc samples continued to increase with the equivalent strain imposed by the anvils even after 30 turns of HPT processing whereas the hardness at the edges of the annealed discs saturated after 10 turns. These differences in the hardness evolution are attributed to the higher Mg content in solid solution in the case of the solution treated samples and its influence on delaying the recovery rate of this aluminium alloy.

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