Preparation and Properties of Ti-47Al-2Cr-2Nb-0.15B Alloy by Powder Metallurgy Route

2015 ◽  
Vol 817 ◽  
pp. 615-620 ◽  
Author(s):  
Zheng Guan Lu ◽  
Jie Wu ◽  
Lei Xu ◽  
Yu You Cui ◽  
Rui Yang
Keyword(s):  
Powder Metallurgy ◽  
Tial Alloy ◽  
Cast Alloy ◽  
Physical Adsorption ◽  
Hot Isostatic Pressing ◽  
Infrared Spectrometry ◽  
Gas Atomization ◽  
Adsorbed Gas ◽  
Near Net Shape ◽  
Adsorption Of Gases

Ti-47Al-2Cr-2Nb-0.15B alloy is a typical γ-TiAl alloy, and powder metallurgy (PM) as a near-net shape method was used to prepare it in this article. Clean pre-alloyed powders were prepared by argon gas atomization, and TiAl alloy was prepared by hot isostatic pressing (HIP) at 1150 °C and 1230 °C. However, surface contamination is inevitable due to chemical reactions with the residual O2 in the vacuum chamber during gas atomization, or due to physical adsorption of O2 and H2O during storage of the powder at room temperature. Infrared spectrometry was used to study this process. We found that the adsorption of gases is mainly H2O. The adsorbed gas in powders would deteriorate the performance of PM alloy, so a gas protection environment is suggested. Tensile properties of PM TiAl alloy were compared with as-cast alloy. Results showed that PM TiAl alloy had better strength which also had more fine and uniform microstructure.

Preparation of Powder Metallurgy Ti-47Al-2Cr-2Nb-0.15B

2014 ◽  
Vol 552 ◽  
pp. 269-273 ◽  
Author(s):  
Jie Wu ◽  
Lei Xu ◽  
Yu You Cui ◽  
Rui Yang
Keyword(s):  
Powder Metallurgy ◽  
Mild Steel ◽  
Tial Alloy ◽  
Hot Isostatic Pressing ◽  
Gas Atomization ◽  
Alloyed Powder ◽  
Atomization Process ◽  
Tial Alloys ◽  
Cp Ti ◽  
Selection Of

Pre-alloyed powder of Ti-47Al-2Cr-2Nb-0.15B was prepared by a gas atomization process and powder metallurgy (PM) γ-TiAl alloys were made through a hot isostatic pressing route. The atomized powders were canned in mild steel and CP-Ti containers, degassed and sealed. The selection of mild steel and CP-Ti on the microstructure of HIPed γ-TiAl alloy was studied. Due to the reaction between mild steel containers and γ-TiAl at relative high temperature (over 1230oC), the γ-TiAl matrix is contaminated. Fully dense compact with CP-Ti container can be obtained by HIPing with suitable parameters of temperature.

Effect of Container on the Microstructure and Properties of Powder Metallurgy TiAl Alloys

2015 ◽  
Vol 817 ◽  
pp. 604-609
Author(s):  
Jie Wu ◽  
Lei Xu ◽  
Zheng Guan Lu ◽  
Rui Peng Guo ◽  
Yu You Cui ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Mild Steel ◽  
Tial Alloy ◽  
Complex Shape ◽  
Pure Titanium ◽  
Tial Alloys ◽  
Microstructure And Properties ◽  
Commercial Pure Titanium ◽  
Near Net Shape ◽  
Cp Ti

Pre-alloyed powder of Ti-47Al-2Cr-2Nb-0.15B was prepared by a gas atomization process and powder metallurgy (PM) γ-TiAl alloys were made through a hot isostatic pressed (HIPed) route. The atomized powders were canned in containers, degassed, sealed, and HIPed. Effect of two different canning materials (mild steel and commercial pure titanium (CP-Ti)) on the microstructure and properties of as-HIPed γ-TiAl alloy were discussed. Due to the reaction between mild steel containers and γ-TiAl at relative high temperature (over 1230 °C), the γ-TiAl matrix is contaminated. CP-Ti canned γ-TiAl showed bigger yield and fracture strength than mild steel canned TiAl. PM γ-TiAl alloy parts having complex shape could be manufactured by the near net-shape process.

Microstructure and Mechanical Properties of Powder Metallurgy Ti-22Al-24Nb-0.5Mo Alloys Joints with Electron Beam Welding

2016 ◽  
Vol 849 ◽  
pp. 321-326
Author(s):  
Jie Wu ◽  
Lei Xu ◽  
Rui Peng Guo ◽  
Zheng Guan Lu ◽  
Yu You Cui ◽  
...  
Keyword(s):  
Electron Beam ◽  
Powder Metallurgy ◽  
Electron Beam Welding ◽  
Base Alloy ◽  
Hot Isostatic Pressing ◽  
Gas Atomization ◽  
Alloyed Powder ◽  
Uniform Microstructure ◽  
Joint Quality ◽  
Dense Powder

In this work, a Ti2AlNb based intermetallic alloy with the composition of Ti–22Al–24Nb–0.5Mo (at. %) pre-alloyed powder was firstly produced by gas atomization, and then fully dense powder metallurgy (PM) Ti2AlNb alloy was prepared by a hot isostatic pressing (HIPing) procedure. The HIPed alloy shows uniform microstructure with low number of porosities. In order to broaden the application field of PM Ti2AlNb alloys, electron beam welding (EBW) was proposed to join the intermetallics. The joint quality, microstructure and microhardness of PM Ti2AlNb alloy processed by EBW were characterized, and the results showed that the both base alloy and EBW joints have high metallurgy quality.

Simulation of Container Design for Powder Metallurgy Titanium Components through Hot-Isostatic-Pressing

2015 ◽  
Vol 817 ◽  
pp. 610-614 ◽  
Author(s):  
Rui Peng Guo ◽  
Lei Xu ◽  
Jie Wu ◽  
Zheng Guan Lu ◽  
Rui Yang
Keyword(s):  
Experimental Data ◽  
Finite Element ◽  
Powder Metallurgy ◽  
Alloy Powder ◽  
Hot Isostatic Pressing ◽  
Fem Simulation ◽  
Isostatic Pressing ◽  
Finite Element Calculations ◽  
Near Net Shape ◽  
Simulation Results

Shima model and two different kinds of container designs were described. The final geometries of powder metallurgy (PM) preforms were predicted by using finite element method. Several PM Ti-6Al-4V parts were fabricated through a hot isostatic pressing route for comparison with the prediction from the modelling. FEM simulation can be used for shrinkage prediction of powder during HIPing process. The finite element calculations agreed well with the experimental data for shrinkage of the titanium alloy powder under HIPing. The simulation results is helpful to fabricate near-net-shape PM titanium parts.

BIOBLU 27

Alloy Digest ◽  
2010 ◽  
Vol 59 (4) ◽  
Keyword(s):  
Powder Metallurgy ◽  
Physical Properties ◽  
Tensile Properties ◽  
Hot Isostatic Pressing ◽  
Heat Treating ◽  
Vacuum Induction Melting ◽  
Induction Melting ◽  
Gas Atomization ◽  
Powder Metal ◽  
Mill Product

Abstract BioBlu 27 alloy is a wrought powder metallurgy product produced by vacuum induction melting (VIM) followed by gas atomization and hot isostatic pressing or by VIM plus electroslag remelting (ESR) to produce 100% billets. The finished mill product is supplied in the annealed, hotworked, or warm-worked condition. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on forming, heat treating, machining, and powder metal forms. Filing Code: CO-119. Producer or source: Carpenter Specialty Alloys.

Development of Powder Metallurgy High Speed Steel

2010 ◽  
Vol 638-642 ◽  
pp. 1854-1859 ◽  
Author(s):  
Hai Lin Zhong ◽  
Y. Fang ◽  
C. Kuang ◽  
X. Kuang ◽  
Q. Hao ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
High Speed ◽  
Nonmetallic Inclusions ◽  
Hot Isostatic Pressing ◽  
High Speed Steel ◽  
Gas Atomization ◽  
Treatment Processes ◽  
Uniform Microstructure ◽  
Powder Metallurgy Process ◽  
Metallurgy Process

High speed steels (HSS) have been widely used worldwide. This paper introduced some research results of high speed steels via Powder Metallurgy process. High speed steels AHPT15 (W12Cr4V5Co5 ) were investigated via gas atomization, hot isostatic pressing, hot working and heat treatment processes. Microstructure of the steels, precipitation of carbides and the influence of nonmetallic inclusions on mechanical properties of the steels were investigated. PM HSS showed fine and uniform microstructure and exhibited excellent toughness and wear resistance, with bend strength up to 3500 MPa and hardness up to 68.0 HRC.

scholarly journals Evolution of the Microstructure and Mechanical Properties of a Ti35Nb2Sn Alloy Post-Processed by Hot Isostatic Pressing for Biomedical Applications

Metals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1027
Author(s):  
Joan Lario ◽  
Ángel Vicente ◽  
Vicente Amigó
Keyword(s):  
Powder Metallurgy ◽  
Mechanical Strength ◽  
Room Temperature ◽  
Hot Isostatic Pressing ◽  
Phase Changes ◽  
Post Processing ◽  
Isostatic Pressing ◽  
Porosity Reduction ◽  
Processing Step ◽  
Hip Process

The HIP post-processing step is required for developing next generation of advanced powder metallurgy titanium alloys for orthopedic and dental applications. The influence of the hot isostatic pressing (HIP) post-processing step on structural and phase changes, porosity healing, and mechanical strength in a powder metallurgy Ti35Nb2Sn alloy was studied. Powders were pressed at room temperature at 750 MPa, and then sintered at 1350 °C in a vacuum for 3 h. The standard HIP process at 1200 °C and 150 MPa for 3 h was performed to study its effect on a Ti35Nb2Sn powder metallurgy alloy. The influence of the HIP process and cold rate on the density, microstructure, quantity of interstitial elements, mechanical strength, and Young’s modulus was investigated. HIP post-processing for 2 h at 1200 °C and 150 MPa led to greater porosity reduction and a marked retention of the β phase at room temperature. The slow cooling rate during the HIP process affected phase stability, with a large amount of α”-phase precipitate, which decreased the titanium alloy’s yield strength.

Effect of Heat Treatment on the Microstructure and Property of TiAl Alloys Prepared by Gas Atomization Powders

2013 ◽  
Vol 747-748 ◽  
pp. 497-501
Author(s):  
Na Liu ◽  
Zhou Li ◽  
Guo Qing Zhang ◽  
Hua Yuan ◽  
Wen Yong Xu ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Heat Treatment Temperature ◽  
Tial Alloy ◽  
Lamellar Microstructure ◽  
Treatment Temperature ◽  
Gas Atomization ◽  
Thermally Induced ◽  
Heat Treated ◽  
Fine Duplex ◽  
Step Heat Treatment

Powder metallurgical TiAl alloy was fabricated by gas atomization powders, and the effect of heat treatment temperature on the microstructure evolution and room tensile properties of PM TiAl alloy was investigated. The uniform fine duplex microstructure was formed in PM TiAl based alloy after being heat treated at 1250/2h followed by furnace cooling (FC)+ 900/6h (FC). When the first step heat treatment temperature was improved to 1360/1h, the near lamellar microstructure was achieved. The ductility of the alloy after heat treatment improved markedly to 1.2% and 0.6%, but the tensile strength decreased to 570MPa and 600MPa compared to 655MPa of as-HIP TiAl alloy. Post heat treatment at the higher temperature in the alpha plus gamma field would regenerate thermally induced porosity (TIP).

Physical adsorption of gases by microporous carbons

1991 ◽  
Vol 58 (4) ◽  
pp. 385-400 ◽  
Author(s):  
P.J.M. Carrott ◽  
M.M.L.Ribeiro Carrott ◽  
R.A. Roberts
Keyword(s):  
Physical Adsorption ◽  
Microporous Carbons ◽  
Adsorption Of Gases

Preparation of Titanium Alloy Parts by Powder Compact Extrusion of a Powder Mixture and Scaled up Manufacture

2016 ◽  
Vol 704 ◽  
pp. 75-84 ◽  
Author(s):  
Fei Yang ◽  
Brian Gabbitas ◽  
Ajit Pal Singh ◽  
Stella Raynova ◽  
Hui Yang Lu ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Powder Metallurgy ◽  
Titanium Alloys ◽  
Powder Mixture ◽  
Powder Compact ◽  
Blended Elemental ◽  
Pilot Plant Scale ◽  
Near Net Shape ◽  
Titanium Processing ◽  
The University

Blended Elemental Powder Metallurgy (BE-PM) is a very attractive method for producing titanium alloys, which can be near-net shape formed with compositional freedom. However, a minimization of oxygen pick-up during processing into manufactured parts is a big challenge for powder metallurgy of titanium alloys. In this paper, different approaches for preparing titanium alloy parts by powder compact extrusion with 0.05-0.1wt.% of oxygen pick-up during manufacturing are discussed. The starting materials were a powder mixture of HDH titanium powder, other elemental powders and a master alloy powder. Different titanium alloys and composites, such as Ti-6Al-4V, Ti-4Al-4Sn-4Mo-0.5Si, Ti-5Al-5V-5Mo-3Cr, and Ti-5Al-5V-5Mo-3Cr-5vol%TiB, with different profiles such as round and rectangular bars, a wedge profile, wire and tubes have been successfully manufactured on a laboratory and pilot-plant scale. Furthermore, a possible route for scaling up the titanium processing capabilities in the University of Waikato has also been discussed.

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