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.

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.

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.

Effects of Forming Processing on Mechanical Properties of Ti-48Al-2Mn-2Nb Intermetallics

2005 ◽  
Vol 297-300 ◽  
pp. 471-476 ◽  
Author(s):  
Wen Zhe Chen ◽  
Kai Ping Peng ◽  
Kuang Wu Qian ◽  
Hai Cheng Gu
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Tial Alloy ◽  
Spray Deposition ◽  
Tensile Elongation ◽  
Hot Isostatic Pressing ◽  
Compressive Properties ◽  
Tial Alloys ◽  
Deformation And Fracture ◽  
Better Than

Ti-48Al-2Mn-2Nb alloy was produced by “centrifugal spray deposition” (CSD), and then hot isostatic pressing (HIP) was employed to remove the porosity formed by CSD. The effects of CSD and HIP processing on the mechanical properties and microstructure of the TiAl alloy were investigated. The results show that the CSD and HIP processing can both improve the strength, plasticity of the TiAl alloy, and the tensile elongation values of the CSD or HIP samples are around 3%, which are better than those of as-cast TiAl alloys in room temperature. Especially, they show more excellent compressive properties at ambient temperature with a compressive ratio of 33.8% and compressive strength of 2210MPa for the CSD samples, and a compressive ratio of 37.8% and compressive strength of 2348MPa for the HIP samples. The CSD processing also improves the fracture toughness of TiAl alloy, which is much higher than that of the HIP processing, while the HIP processing seems to be beneficial the ductility and plasticity as having a duplex structure. The effects of CSD and HIP processing on microstructure and properties of TiAl alloys are discussed to understand the deformation and fracture process of the alloy.

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.

Selection of Wear Resistive Nano coating in En8 Steel

2019 ◽  
Vol 1 (2) ◽  
pp. 73-80
Author(s):  
Ilangkumaran M ◽  
Tiruvenkadam N ◽  
Saranya M ◽  
Thulsidharan R
Keyword(s):  
Mild Steel ◽  
Mechanical Action ◽  
Medium Carbon Steel ◽  
Solid Surfaces ◽  
Material Surface ◽  
Multi Criteria Decision Making ◽  
Sliding Surface ◽  
Medium Carbon ◽  
Nano Coating ◽  
Selection Of

Where is the abrasive or gradual removal of materials at solid surfaces? It is caused due to the interaction between the sliding surface by mechanical action. The abrasive wears can be recognised as scratches or grooves. To enhance the wear resistance suitable nanocoating is applied on the material surface for better tribological properties such as hardness and toughness. Wear resistant nanocoating is used to reduce or eradicate wear to extend the lifetime of the EN8 steel. EN8 is unalloyed medium carbon steel with better mechanical properties than mild steel and also readily machinable in any condition. The nanocoating materials such as Al2O3, TiO2, SiC, ZrO2, WS2, Si3N4 etc., are used to reduce wear and to enhance hardness and toughness on mild steel through various nanocoating techniques. This paper deals with selection of suitable nanocoating material through AHP (Analytical hierarchal process) - a multi-criteria decision-making method.

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).

Preparation and Welding Performance of Ti–6Al–4V Powder Compact Fabricated by Hot Isostatic Pressing

2016 ◽  
Vol 849 ◽  
pp. 760-765 ◽  
Author(s):  
Rui Peng Guo ◽  
Lei Xu ◽  
Jie Wu ◽  
Zheng Guan Lu ◽  
Rui Yang
Keyword(s):  
Electron Beam Welding ◽  
Welded Joint ◽  
Hot Isostatic Pressing ◽  
Butt Joint ◽  
Alloyed Powder ◽  
Practical Application ◽  
Isostatic Pressing ◽  
Properties Of Materials ◽  
Microstructural Design ◽  
Welding Properties

Powder metallurgy (P/M) Ti–6Al–4V alloy was produced by hot isostatic pressing from pre-alloyed powder in the present investigation. Electron beam welding (EBW) was used for butt joint of P/M Ti–6Al–4V sheets. Microstructure and tensile properties of P/M Ti–6Al–4V welded joint were studied. The results showed that the microstructure of the welded joint had a significant change due to the rapid cooling rate during the EBW process. The microhardness of the fusion zone was higher than that of other areas due to the occurrence of α' martensitic phase. The joint performance (tensile strength) was equal to that of weld matrix, and all of the tensile specimens failed in the base metal. For practical application of P/M Ti-based alloys, the ductility, strength and welding properties of materials could be optimized by proper microstructural design.

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