A study of the hot-working behavior of SiC−Al alloy composites and their matrix alloys by hot torsion testing

1987 ◽  
Vol 18 (2) ◽  
pp. 303-312 ◽  
Author(s):  
J. R. Pickens ◽  
T. J. Langan ◽  
R. O. England ◽  
M. Liebson
Keyword(s):  
Hot Working ◽  
Al Alloy ◽  
Torsion Testing ◽  
Hot Torsion

scholarly journals Hot Ductility of TiNb IF Steel Slab after Hot Torsion Testing

Metals ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 752 ◽  
Author(s):  
Konrádyová ◽  
Longauerová ◽  
Jonšta ◽  
Jonšta ◽  
Longauer ◽  
...  
Keyword(s):  
Temperature Cycling ◽  
Hot Ductility ◽  
If Steel ◽  
Cast Slab ◽  
Torsion Testing ◽  
Steel Slab ◽  
Temperature Dependences ◽  
Hot Torsion ◽  
Average Size ◽  
20 Nm

The aim of the work was to evaluate the hot ductility loss in TiNb stabilized IF steel directly from the continuously-cast slab using hot torsion testing (plastometry) in the temperature range 600–1250 °C according to the basic programme, and also after temperature cycling. A good match of the temperature dependences of number of turns to failure (Nf) and intensity of deformation Se was confirmed. In both cases, the existence of three temperature areas with decrease in plasticity to a minimum was confirmed. The two-stage temperature cycling according to the CT1150 and CT900 programmes mostly resulted in a decrease in plasticity compared to the basic programme. The most significant effect of cycling was related to the CT900 programme below the maximum plasticity in the base programme at 850 °C. A less pronounced decrease was observed for CT1150 cycling below the maximum plasticity in the base program at 1050 °C. In the case of CT1150 cycling, more complex particles were observed at the fractures compared with the basic programme, namely carbonitrides of Ti and Nb in combination with oxisulfides respectively, then Ti nitrides with oxisulfides or oxides and, in addition, complex (Fe,Nb)P4, (Ti,Nb)3S4 type particles. Their mean size determined statistically using TEM was much finer, only 20 nm versus 42 nm in the basic programme. Similarly, CT900 cycling revealed finer particles with an average size of 37 nm compared to 105 nm in the basic programme. The observed particles were Al oxides, Ti(N,C) and (Ti,Nb)2S, in contrast to the particles probably of TiFe and FeMnS in the basic programme. The decrease in plasticity corresponded to the finer particles, newly created in the temperature cycling.

scholarly journals Dynamic Recrystallization Behavior and Processing Map of the 6082 Aluminum Alloy

Materials ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1042 ◽  
Author(s):  
Dao-chun Hu ◽  
Lei Wang ◽  
Hong-jun Wang
Keyword(s):  
Dynamic Recrystallization ◽  
Critical Strain ◽  
High Efficiency ◽  
Processing Map ◽  
Testing Machine ◽  
Hot Compression ◽  
Hot Working ◽  
Al Alloy ◽  
Strain Rates ◽  
6082 Al Alloy

Multiple hot-compression tests were carried out on the 6082 aluminum (Al) alloy using a Gleeble-1500 thermal simulation testing machine. Data on flow stresses of the 6082 Al alloy at deformation temperatures of 623 to 773 K and strain rates from 0.01 to 5 s−1 were attained. Utilizing electron backscatter diffraction (EBSD) and a transmission electron microscope (TEM), the dynamic recrystallization behaviors of the 6082 Al alloy during hot compression in isothermal conditions were explored. With the test data, a hot-working processing map for the 6082 Al alloy (based on dynamic material modeling (DMM)) was drawn. Using the work-hardening rate, the initial critical strain causing dynamic recrystallization was determined, and an equation for the critical strain was constructed. A dynamic model for the dynamic recrystallization of the 6082 Al alloy was established using analyses and test results from the EBSD. The results showed that the safe processing zone (with a high efficiency of power dissipation) mainly corresponded to a zone with deformation temperatures of 703 to 763 K and strain rates of 0.1 to 0.3 s−1. The alloy was mainly subjected to continuous dynamic recrystallization in the formation of the zone. According to the hot-working processing map and an analysis of the microstructures, it is advised that the following technological parameters be selected for the 6082 Al alloy during hot-forming: a range of temperatures between 713 and 753 K and strain rates between 0.1 and 0.2 s−1.

Development of Processing Maps for 3003 Al Alloy

2011 ◽  
Vol 291-294 ◽  
pp. 306-310 ◽  
Author(s):  
Gui Qing Chen ◽  
Gao Sheng Fu ◽  
Wen Duan Yan ◽  
Chao Zeng Cheng ◽  
Ze Chang Zou
Keyword(s):  
Strain Rate ◽  
Flow Instability ◽  
Hot Working ◽  
Al Alloy ◽  
Processing Maps ◽  
Isothermal Compression ◽  
Instability Domain ◽  
Optimum Parameters ◽  
Dynamic Materials ◽  
Dynamic Materials Model

The 3003 Al alloy was deformed by isothermal compression in the range of deformation temperature 300-500 °C at strain rate 0.0l-10.0 s-1 with Gleeble-1500 thermal simulator. Processing maps at a strain of 0.6 for hot working were developed on a dynamic materials model. The maps exhibit a flow instability domain at about 300 °C-380 °C and 1.0-10.0 s-1. DRX occurs extensively in the temperature range of 450-500 °C and at the strain rate of 10.0 s-1. The optimum parameters of hot working for 3003 Al alloy at the strain of 0.6 are confined at 500 °C and 10.0 s-1 with the highest efficiency (37%).

Hot Working of an as-Cast Mg-2%Al Alloy

2003 ◽  
Vol 426-432 ◽  
pp. 4417-4422 ◽  
Author(s):  
Ravi S. Kottada ◽  
Atul H. Chokshi
Keyword(s):  
Hot Working ◽  
Al Alloy

Improving the Corrosion Resistance of Hot-Working Mold Steel against Al Alloy Melt by Coating

2016 ◽  
Vol 877 ◽  
pp. 67-72 ◽  
Author(s):  
Yao Yong Yi ◽  
Zhe Min Luo ◽  
Tungwai Leo Ngai ◽  
Sieglind Ngai ◽  
Lie Jun Li
Keyword(s):  
Corrosion Resistance ◽  
Steel Corrosion ◽  
Hot Working ◽  
Al Alloy ◽  
X Ray Diffraction ◽  
Crn Coating ◽  
Phase Constituent ◽  
Hot Working Die Steel ◽  
Crn Coatings ◽  
Layer Coating

In order to reduce the adhesion tendency of aluminum melt on the die casting mold and extend the service life of the die, multi-arc ion plating technique was used to deposit Ti/TiN/CrN multi-layer coating on the surface of 8418 hot-working mold steel. Corrosion resistance of the steel and the Ti/TiN/CrN coating against Al alloy melt was studied. X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy were used to study the microstructure, phase constituent and phase composition of the materials. Uniform Ti/TiN/CrN coatings with good bonding interfaces and a total thickness of about 2 μm were obtained. Results showed that Ti/TiN/CrN coating can improve the corrosion resistance of the 8418 hot-working die steel significantly against the aluminum alloy melt.

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