scholarly journals The Effects of Hot-Pack Coating Materials on the Pack Rolling Process and Microstructural Characteristics during Ti-46Al-8Nb Sheet Fabrication

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 762
Author(s):  
Huang ◽  
Liao ◽  
Yu ◽  
Liu ◽  
Wang
Keyword(s):  
Stainless Steel ◽  
Titanium Alloy ◽  
Grain Boundary ◽  
Rolling Process ◽  
Interfacial Reactions ◽  
Stress Strain ◽  
Microstructural Characteristics ◽  
Local Flow ◽  
Pack Rolling ◽  
Hot Pack

The effects of the package materials on the hot workability and stress-strain characteristics of high-Nb TiAl alloy with a nominal composition of Ti-46Al-8Nb (in at.%) were systematically studied via “sandwich structure” hot compression. TiAl sheet fabrication was conducted by hot pack rolling, and the microstructural characteristics and deformation mechanisms were investigated. Based on the analysis of compressed samples and stress-strain curves, the stainless steel/TiAl structure showed better deformation compatibility with homogeneous deformation and decreasing resistance. However, severe interfacial reactions were inevitable. Meanwhile, for the titanium alloy/TiAl structure, few interfacial reactions happened, but wavy deformation and high resistance complicated the compression process. Finally, a package structure with an outer stainless steel isolation layer and inner titanium alloy was determined for the pack rolling process. A TiAl sheet with no crack defects was obtained with 80% reduction. The pack-rolled TiAl sheet took on alternate microstructure of the grain-boundary Al-enriched ribbons and elongated lamellar colonies ribbons. The grain-boundary recrystallized α2 phase, lumpy γ phase, and massive α2/γ lamellae could be observed, which led to the scatter microstructure. The microstructural characteristics mainly resulted from the solute segregations of as-cast Ti-46Al-8Nb alloys, which triggered the local flow softening and deformation incompatibility during hot pack rolling.

Experience of Hot Pack Rolling Application for Production of Specific Steels or Creep Resistant Alloys

2020 ◽  
Vol 989 ◽  
pp. 699-704
Author(s):  
Nikita S. Deryabin ◽  
Sergey M. Chernyshev ◽  
Sergey N. Veselkov
Keyword(s):  
Hot Rolling ◽  
Deformation Behavior ◽  
Import Substitution ◽  
Rolling Process ◽  
Plastic Range ◽  
Pack Rolling ◽  
Hot Rolling Process ◽  
Hot Rolled ◽  
Rolled Plates ◽  
Hot Pack

Under the current conditions, the consumption of special purpose alloys or steels is growing. This is due to the development of the import substitution program. It should be noted, that such materials possess specific deformation behavior, which requires providing particular conditions of a hot rolling process. One of the characteristics of the deformation behavior is the narrow thermal plastic range. Therefore, it is necessary to conduct a hot rolling in several stages, which include interchange of heating and rolling processes. For the purpose to resolve the issue, the experience of the multilayer hot rolling of plates has been investigated where all advantages of this way of a hot rolling process were used. Based on the method of the multilayer hot rolling, the pack rolling has been developed which gives the possibility of production of hot-rolled plates from special purpose alloys or steels.

Deformation Characteristics of Aluminum-Clad Stainless Steel Sheet Under Uniaxial Tension

1998 ◽  
Vol 120 (1) ◽  
pp. 179-184 ◽  
Author(s):  
T. Mori ◽  
S. Kurimoto
Keyword(s):  
Stainless Steel ◽  
Tensile Test ◽  
Rolling Process ◽  
Deformation Characteristics ◽  
Stress Strain ◽  
Steel Sheets ◽  
Clad Sheet ◽  
Strain Relationship ◽  
Relationship Of

Clad sheets are now widely used in a wide variety of industrial practices, however, determination of deformation characteristics are difficult. In this research, the unique deformation characteristics and properties of aluminum-clad stainless steel sheets produced by hot rolling process are discussed. The tensile test and characteristics of necking appearing on the clad sheet and the separate materials composing the clad sheet are examined. The results of the experiments for the stress-strain curves of the separate materials compared well with the estimated values. The stress-strain relationship of the separate materials can thus be determined from the tensile test of clad sheet.

Establishment of Processing Maps for 25vol.% B4CP/AA6061 Composite and its Application in Hot Pack-Rolling Process

2018 ◽  
Vol 913 ◽  
pp. 498-508
Author(s):  
Sheng Pu Liu ◽  
De Fu Li ◽  
Sheng Li Guo ◽  
Peng Du
Keyword(s):  
Rolling Process ◽  
Processing Parameters ◽  
Strain Rate Range ◽  
Processing Maps ◽  
Hot Workability ◽  
Rolling Velocity ◽  
Surface Cracking ◽  
Pack Rolling ◽  
Edge Cracking ◽  
Hot Pack

The hot workability and hot pack-rolling process of B4CP/AA6061 composite were studied. The results showed that the addition of B4C particles could effectively promote the dynamic recrystallization (DRX) process of the composite. DRX and DRX grains growth were dominant deformation mechanism during hot deformation of B4CP/AA6061composite. Typical instability defects included micro voids and particle aggregation. The optimum processing parameters for good workability were obtained in the temperature range of 450°C-500°C and strain rate range of 0.01s-1-0.1s-1. According to the flow stress curves and processing maps, a temperature of 500°C and a rolling velocity of 40 mm/s were chosen for pack-rolling experiments. The pack-rolled composite sheets in the RD and TD showed more homogeneous DRX grains than as-HIPed microstructures, which might indicate that hot pack-rolling could lead to more homogeneous microstructures without any edge cracking and surface cracking.

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