Effect of the process control agent in the ball-milled powders and SPS-consolidation temperature on the grain refinement, density and Vickers hardness of Fe14Cr ODS ferritic alloys

2019 ◽  
Vol 347 ◽  
pp. 103-113 ◽  
Author(s):  
V. Mihalache ◽  
I. Mercioniu ◽  
A. Velea ◽  
P. Palade
Keyword(s):  
Process Control ◽  
Grain Refinement ◽  
Vickers Hardness ◽  
Control Agent ◽  
Process Control Agent ◽  
Ferritic Alloys ◽  
Consolidation Temperature ◽  
Milled Powders

ROLE OF PROCESS CONTROL AGENT ON MECHANICAL ALLOYING OF NANO STRUCTURED TiAl-BASED ALLOY

2008 ◽  
Vol 22 (18n19) ◽  
pp. 2933-2938 ◽  
Author(s):  
H. BAHMANPOUR ◽  
S. HESHMATI-MANESH
Keyword(s):  
Process Control ◽  
Stearic Acid ◽  
Milled Powder ◽  
High Energy ◽  
Control Agent ◽  
X Ray Diffraction ◽  
Process Control Agent ◽  
Crystallite Sizes ◽  
Energy Ball ◽  
Milled Powders

High energy ball milling was performed on a mixture of titanium and aluminum elemental powders with a composition of Ti -48(at.%) Al . Stearic acid was added to this powder mixture as a process control agent (PCA) to study its effect on the microstructure evolution and crystallite size of the milled powder after various milling times. Phase compositions and morphology of the milled powders were evaluated using X-ray diffraction and scanning electron microscopy. Crystallite sizes of milled powders were determined by Cauchy-Gaussian approach using XRD profiles. It was shown that addition of 1wt.% of stearic acid not only minimizes the adhesion of milling product to the vial and balls, but also reduces its crystallite sizes. It has also a marked effect on the morphology of the final product.

Effect of process control agent on alloying and mechanical behavior of L21 phase Ni–Ti–Al alloys

2019 ◽  
Vol 740-741 ◽  
pp. 130-136 ◽  
Author(s):  
Jun Shi ◽  
Aofeng Zheng ◽  
Zehui Lin ◽  
Rong Chen ◽  
Jugong Zheng ◽  
...  
Keyword(s):  
Process Control ◽  
Mechanical Behavior ◽  
Control Agent ◽  
Al Alloys ◽  
Process Control Agent

Combustion Synthesis of Mechanically-Activated Nb-Al Mixtures

2005 ◽  
Vol 498-499 ◽  
pp. 152-157 ◽  
Author(s):  
Fabiana Buracovas ◽  
Valéria S. Gonçalves ◽  
Cláudio José da Rocha ◽  
Ricardo Mendes Leal Neto
Keyword(s):  
Water Immersion ◽  
Control Agent ◽  
Milling Process ◽  
Sem Analysis ◽  
X Ray Diffraction ◽  
Process Control Agent ◽  
Effective Dispersion ◽  
Powder Mass ◽  
Ignition And Combustion ◽  
Milled Powders

In this work shake milling were used to mechanically activate Nb – Al powder mixtures at different relative proportions (Nb80Al, Nb65Al, Nb54Al e Nb42Al). All milling process parameters were unchanged, e.g., powders mass, ball/powder mass ratio, balls diameter, quantity and kind of process control agent. Uniaxially compacted cylindrical pellets of milled powders were vacuum reacted. After a two-step degassing treatment (290°C for 0.5 h and 400°C for 4 h), samples were heated at 30°C/min. Ignition and combustion temperatures were measured by a thermocouple inserted in a hole drilled into the pellets. The microstructure of milled powders and reacted pellets were characterized by X-ray diffraction and SEM analysis. Bulk density of the pellets was measured by water immersion (Archimedes). The results showed a decrease of both ignition and combustion temperature with mechanical activation as seen by comparison with reacted pellets of the same composition not mechanically activated (simple mixtures). By increasing the heating hate the completeness of the reactions were improved. The lower the aluminum contents the lower the ignition and combustion temperatures and also the densification. The decrease on ignition temperature was caused by a more effective dispersion (and so more activation) attained by samples with lower aluminum content.

Long-term stability of the microstructure of austenitic ODS steel rods produced with a carbon-containing process control agent

2019 ◽  
Vol 523 ◽  
pp. 111-120 ◽  
Author(s):  
Tim Gräning ◽  
Michael Klimenkov ◽  
Michael Rieth ◽  
Cornelia Heintze ◽  
Anton Möslang
Keyword(s):  
Process Control ◽  
Control Agent ◽  
Process Control Agent ◽  
Term Stability ◽  
Long Term Stability ◽  
Ods Steel
Sign in / Sign up

Export Citation Format

Share Document