Microstructure and Tensile Properties of Hot Worked High Nb Containing TiAl Alloy on Industrial Scale

2005 ◽  
Vol 475-479 ◽  
pp. 785-788
Author(s):  
Jun Pin Lin ◽  
Xiang Jun Xu ◽  
Jian Feng Gao ◽  
Yan Li Wang ◽  
Zhi Lin ◽  
...  
Keyword(s):  
Grain Size ◽  
Tensile Properties ◽  
High Temperatures ◽  
Tial Alloy ◽  
Hot Working ◽  
Industrial Scale ◽  
Initial Microstructure ◽  
Similar Composition ◽  
Fine Grain ◽  
Good Workability

. A hot working and its effect on the microstructure and tensile properties of Ti-45Al-9 (Nb, W, B, Y) alloy ingot on industrial scale were investigated. The results showed that the alloy has good workability in anα+γphase region. An ingot on industrial scale was successfully extruded followed by multi-step canned forging. The initial microstructure of the alloy is fine full lamellar (FL) microstructure. After hot working a sound pancake exhibiting a fine grain duplex (DP) microstructure with grain size about 20μm was obtained. The as-forged alloy has more balanced tensile properties than the small heats with similar composition and microstructure at both room and high temperatures.

scholarly journals Minimisation of Heating Time for Full Hardening in Hot Stamping Using Direct Resistance Heating

2020 ◽  
Vol 4 (3) ◽  
pp. 80
Author(s):  
Tomoyoshi Maeno ◽  
Ken-ichiro Mori ◽  
Masato Sakagami ◽  
Yoshitaka Nakao ◽  
Ali Talebi-Anaraki
Keyword(s):  
Heat Treatment ◽  
Grain Size ◽  
Standard Deviation ◽  
Steel Sheet ◽  
Hot Stamping ◽  
Heating Time ◽  
Resistance Heating ◽  
Initial Microstructure ◽  
Fine Grain

To obtain enough hardness of the die-quenched products after hot stamping using direct resistance heating, the effects of the electrifying condition and initial microstructure of the quenchable steel sheet on hardness were examined in a hot bending experiment. The steel sheet was heated up to 900 °C in 3 to 10 s. The required heating time was shortened by normalising heat treatment due to the fine grain size of the sheet. The standard deviation of the hardness of the sheet heated to 900 °C in 3.2 s without temperature holding at the austenitising temperature was 12 HV, whereas the deviation reduced to 5 HV for temperature holding at the austenitising temperature of 3 s.

Microstructure and Tensile Properties of Hot Worked High Nb Containing TiAl Alloy on Industrial Scale

2005 ◽  
pp. 785-788
Author(s):  
Jun Pin Lin ◽  
Xiang Jun Xu ◽  
Jian Feng Gao ◽  
Yan Li Wang ◽  
Zhi Lin ◽  
...  
Keyword(s):  
Tensile Properties ◽  
Tial Alloy ◽  
Industrial Scale

RA 85H

Alloy Digest ◽  
1988 ◽  
Vol 37 (1) ◽  
Keyword(s):  
Grain Size ◽  
Physical Properties ◽  
Tensile Properties ◽  
Oxidation Resistance ◽  
Thermal Fatigue ◽  
Heat Treating ◽  
Annealed Condition ◽  
Good Oxidation Resistance ◽  
Heat Resistant Alloy ◽  
Fine Grain

Abstract RA85H is a fully austenitic heat-resistant alloy modified with silicon for resistance to carburization. An addition of aluminum confers good oxidation resistance and improves resistance to sulfidation. The fine grain size of this alloy in the solution annealed condition provides unusual resistance to thermal fatigue in applications where it is subjected to quenching. This datasheet provides information on composition, physical properties, and tensile properties as well as creep. It also includes information on forming, heat treating, machining, and joining. Filing Code: SS-492. Producer or source: Rolled Alloys Inc..

scholarly journals The Effect of Hot Working on the Mechanical Properties of High Strength Biomedical Ti-Nb-Ta-Zr-O Alloy

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4233 ◽  
Author(s):  
Dalibor Preisler ◽  
Miloš Janeček ◽  
Petr Harcuba ◽  
Jan Džugan ◽  
Kristýna Halmešová ◽  
...  
Keyword(s):  
Grain Size ◽  
Tensile Properties ◽  
Hot Working ◽  
Fatigue Performance ◽  
High Yield ◽  
Chemical Inhomogeneity ◽  
Cast Material ◽  
Hip Joint Replacement ◽  
Area Reduction ◽  
Hot Rolled

Beta titanium alloy Ti-35Nb-6Ta-7Zr-0.7O (wt%) was developed as a material intended for the manufacturing of a stem of a hip joint replacement. This alloy contains only biocompatible elements and possesses a very high yield strength already in the cast condition (900 MPa). However, the porosity, large grain size and chemical inhomogeneity reduce the fatigue performance below the limits required for utilization in the desired application. Two methods of hot working, die forging and hot rolling, were used for processing of this alloy. Microstructural evolution, tensile properties and fatigue performance of the hot worked material were investigated and compared to the cast material. Microstructural observations revealed that porosity is removed in all hot-worked conditions and the grain size is significantly reduced when the area reduction exceeds 70%. Static tensile properties were improved by both processing methods and ultimate tensile strength (UTS) of 1200 MPa was achieved. Fatigue results were more reproducible in the hot rolled material due to better microstructural homogeneity, but forging leads to an improved fatigue performance. Fatigue limit of 400 MPa was achieved in the die-forged condition after 70% of area reduction and in the hot rolled condition after 86% of area reduction.

Effect of Asymmetric Rolling with Cone-Shaped Rolls on Microstructure and Tensile Properties of Low-Carbon Steel

2015 ◽  
Vol 1105 ◽  
pp. 149-153
Author(s):  
Toleu K. Balgabekov ◽  
Eldar M. Azbanbayev ◽  
Aristotel Z. Isagulov ◽  
Diana A. Isagulova ◽  
Nurlybek B. Zakariya ◽  
...  
Keyword(s):  
Grain Size ◽  
Carbon Steel ◽  
Tensile Properties ◽  
Low Carbon Steel ◽  
Middle Layer ◽  
Low Carbon ◽  
Asymmetric Rolling ◽  
Fine Grain ◽  
Average Grain Size ◽  
Different Temperatures

The effect of asymmetric rolling with cone-shaped rolls on ultra-fine grain evolution was investigated. To do this, low-carbon steel containing 0.15 % C (mass fraction) billet (h|b|l = 10|45|100 mm3) with the initial average grain size of 60 μm was deformed up to the thickness of 5mm in cone-shaped rolls with diameters ratio of 1.5, as well as in cylindrical rolls. Rolling was conducted at three different temperatures: 900 °C, 1000 °C and 1100 °C. Four passes of asymmetric rolling in cone-shaped rolls were given to gain thickness of 5 mm with total reduction of 61,7 %. It has been shown that during asymmetric rolling in cone-shaped rolls at low temperature of 900 °C grain size is smaller (0.092 μm – at the surface layer and 0.112 μm – at the middle layer) than that of 1000 °C and 1100 °C. Tensile properties of asymmetrically rolled specimen were much higher (580 MPa) in comparison to symmetrically rolled one (486 MPa).

Titanium Boride in High Nb Containing TiAl Alloy: Morphology and Effect on Mechanical Properties

2011 ◽  
Vol 415-417 ◽  
pp. 1121-1126
Author(s):  
Xiang Jun Xu ◽  
Jun Pin Lin ◽  
Yan Li Wang
Keyword(s):  
Mechanical Properties ◽  
Tensile Properties ◽  
High Temperatures ◽  
Room Temperature ◽  
Tial Alloy ◽  
Cast Alloy ◽  
Harmful Effect ◽  
Titanium Boride ◽  
Creep Properties

The morphology of titanium boride in as-cast and as-forged Ti-45Al-8.5Nb-(W, B, Y) alloy containing 0.2at. % boron and the effect of borides on tensile and creep properties of the alloy are investigated. The results show that in as-cast alloy the morphology of boride appears mainly convoluted ribbons with some flakes and particles. With the extent of forging increases, the length of the ribbons decreases and their distribution is more uniform. The long ribbon in as-cast alloy is detrimental to tensile properties at both room temperature (RT) and high temperatures. The short ribbon in as-forged alloy is not harmful to RT tensile properties, but is harmful to tensile and creep properties at high temperatures. The harmful effect of the boride is due to the strain incompatibility of boride and matrix, which causes many cavities at boride/matrix boundaries and results in ultimate fracture.

Effect of included oxide films on the structure of the Beilby layer

1952 ◽  
Vol 212 (1111) ◽  
pp. 458-459 ◽  
Keyword(s):  
Grain Size ◽  
Grain Growth ◽  
High Temperatures ◽  
Oxide Films ◽  
Subsequent Annealing ◽  
Surface Layers ◽  
Fine Grain ◽  
Oxide Particles ◽  
Considerable Depth

Experiments show that during repeated sliding, oxide is included to a considerable depth beneath the surface of the metal. Subsequent annealing at high temperatures shows that the included oxide particles prevent grain growth in the surface layers. This process may be largely responsible for the fine grain size of the Beilby layer.

A Criterion for Conventional Dynamic Recrystallization: Application to Magnesium Alloys

2007 ◽  
Vol 550 ◽  
pp. 369-374
Author(s):  
Matthew R. Barnett ◽  
Aiden G. Beer
Keyword(s):  
Grain Size ◽  
Steady State ◽  
Dynamic Recrystallization ◽  
Magnesium Alloys ◽  
High Temperatures ◽  
Working Conditions ◽  
Analytical Approximation ◽  
Hot Working ◽  
Strain Rates ◽  
Recrystallized Grain Size

An analytical approximation for the steady state dynamic recrystallized grain size is combined with a simple nucleation criterion to assess the propensity for dynamic recrystallization. In line with observation, the criterion predicts dynamic recrystallization in 99.9995% pure Al but not in material 99.5% pure. It also agrees with the observation that zone refined ferrite can display dynamic recrystallization at high temperatures and low strain rates but not at lower hot working temperatures. The criterion is applied here to common wrought magnesium alloys to argue that conventional dynamic recrystallization is expected under "normal" hot working conditions.

Aspects of microanalysis in a transmission electron microscope

1978 ◽  
Vol 36 (1) ◽  
pp. 510-511
Author(s):  
R. Sinclair ◽  
B.E. Jacobson
Keyword(s):  
Grain Size ◽  
Electron Beam ◽  
Electron Microscope ◽  
Chemical Analysis ◽  
Transmission Electron Microscope ◽  
Vapor Deposition ◽  
Critical Currents ◽  
X Ray ◽  
Fine Grain ◽  
Transmission Electron

INTRODUCTIONThe prospect of performing chemical analysis of thin specimens at any desired level of resolution is particularly appealing to the materials scientist. Commercial TEM-based systems are now available which virtually provide this capability. The purpose of this contribution is to illustrate its application to problems which would have been intractable until recently, pointing out some current limitations.X-RAY ANALYSISIn an attempt to fabricate superconducting materials with high critical currents and temperature, thin Nb3Sn films have been prepared by electron beam vapor deposition [1]. Fine-grain size material is desirable which may be achieved by codeposition with small amounts of Al2O3 . Figure 1 shows the STEM microstructure, with large (∽ 200 Å dia) voids present at the grain boundaries. Higher quality TEM micrographs (e.g. fig. 2) reveal the presence of small voids within the grains which are absent in pure Nb3Sn prepared under identical conditions. The X-ray spectrum from large (∽ lμ dia) or small (∽100 Ǻ dia) areas within the grains indicates only small amounts of A1 (fig.3).

MICROCAST-X MAR-M-247

Alloy Digest ◽  
1995 ◽  
Vol 44 (5) ◽  
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Tensile Properties ◽  
Negative Impact ◽  
Rupture Properties

Abstract The Microcast-X process produces a substantially finer grain size that improves mechanical properties in MAR-M-247 with modest negative impact on rupture properties above 1600 F (871 C). This datasheet provides information on composition, microstructureand tensile properties as well as creep and fatigue. It also includes information on casting. Filing Code: Ni-481. Producer or source: Howmet Corporation.

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