scholarly journals Near Net Shaping of Metal Injection Molded Compacts by Pulsed Discharge Sintering Process under Pseudo Hot Isostatic Pressing.

1997 ◽  
Vol 44 (11) ◽  
pp. 1037-1042 ◽  
Author(s):  
Akihiro Matsumoto ◽  
Kiyotaka Katoh ◽  
Kunisuke Andoh
Keyword(s):  
Hot Isostatic Pressing ◽  
Sintering Process ◽  
Pulsed Discharge ◽  
Isostatic Pressing ◽  
Injection Molded ◽  
Near Net Shaping ◽  
Net Shaping

Hot Isostatic Pressing of Ti6Al4V Alloys Monolithic Bladed Disks

2014 ◽  
Vol 496-500 ◽  
pp. 279-283 ◽  
Author(s):  
Peng Ju Xue ◽  
Yan Wu ◽  
Qing Song Wei ◽  
Yu Sheng Shi
Keyword(s):  
Tensile Strength ◽  
Hot Isostatic Pressing ◽  
Fracture Morphology ◽  
Bladed Disks ◽  
Isostatic Pressing ◽  
Bladed Disk ◽  
Near Net Shape ◽  
Near Net Shaping ◽  
Net Shaping ◽  
Parts Manufacturing

Near-net-shaping hot isostatic pressing (NNS-HIP) method was used for once-forming complex monolithic Ti6Al4V alloy bladed disks manufacturing. The complex monolithic bladed disks were formed successfully in a near-net-shape manner using the proposed HIP mold scheme in this study. The results showed that there were fine and homogeneous strip α+β phases and no obvious pores or cracks were detected. A "layered" phenomenon was observed in as-built part microstructure. The tensile strength value of specimens from the NNS-HIP bladed disks in the same furnace reached 900MPa, which was higher than the values of parts manufactured using casting and forging processes. The fracture morphology analysis showed that the sample had a ductile fracture. This study provides a reference to the NNS-HIP for the bladed disk parts manufacturing.

scholarly journals Near Net Shaping of Mechanically alloyed Fe-48at%Cr Powder by Pulsed Current Sintering Process.

2000 ◽  
Vol 47 (10) ◽  
pp. 1097-1101 ◽  
Author(s):  
Keizo Kobayashi ◽  
Akihiro Matsumoto ◽  
Toshiyuki Nishio ◽  
Kimihiro Ozaki ◽  
Akira Sugiyama
Keyword(s):  
Pulsed Current ◽  
Sintering Process ◽  
Mechanically Alloyed ◽  
Near Net Shaping ◽  
Net Shaping

Effect of Porosity on Mechanical Properties of Ti-5Al-2.5Sn ELI Alloy from Atomized Powder

2015 ◽  
Vol 817 ◽  
pp. 587-592 ◽  
Author(s):  
Lei Xu ◽  
Rui Peng Guo ◽  
Rui Yang
Keyword(s):  
Mechanical Properties ◽  
Hot Isostatic Pressing ◽  
Cryogenic Temperatures ◽  
Significant Difference ◽  
Complex Shapes ◽  
Near Net Shape ◽  
Net Shape Forming ◽  
Near Net Shaping ◽  
Net Shaping

Ti-5Al-2.5Sn ELI alloy is a typical α titanium, which is widely used at cryogenic temperatures. Hot isostatic pressing (HIPing) is a common technology to fabricate powder metallurgy (P/M) titanium alloys and components. Porosity control is very crucial for P/M alloys during application, and porosity will deteriorate mechanical properties of P/M alloys. In this study, porosity caused by HIPing process has been investigated. Effects of porosity on metallurgy quality of P/M Ti-5Al-2.5Sn ELI alloy have been accessed. The results showed that when porosity levels was less than 0.6%, no significant difference was found comparing with full dense P/M Ti-5Al-2.5Sn ELI alloy. Near-net-shape forming processes of P/M titanium alloy parts ware studied. By using metal capsules and metal internal tooling, near-net-shaping of P/M parts with complex shapes was demonstrated.

scholarly journals Modification of Sintered Titanium Alloys by Hot Isostatic Pressing

2012 ◽  
Vol 520 ◽  
pp. 63-69 ◽  
Author(s):  
L. Bolzoni ◽  
E.M. Ruiz-Navas ◽  
De Liang Zhang ◽  
Elena Gordo
Keyword(s):  
Titanium Alloys ◽  
Alloy Powder ◽  
Hot Isostatic Pressing ◽  
Ingot Metallurgy ◽  
Sintered Titanium ◽  
Sintering Process ◽  
Process Step ◽  
Isostatic Pressing ◽  
Powder Pressing ◽  
Property Changes

Powder metallurgy (PM) permits to obtain titanium alloys with properties and microstructures close to ingot metallurgy products. However, residual porosity is normally present in the products produced by the PM route of powder pressing and sintering (P&S)\, and this needs to be reduced by using post-sintering process step such as hot isostatic pressing (HIP) and forging. In this study, the microstructural and mechanical property changes caused by HIP of samples of two alloys, near-α Ti-3Al-2.5V alloy and α+β Ti-6Al-4V, produced by P&S route were investigated. Two types of powders were utilised: prealloyed powders and blend of elemental titanium powder and master alloy powder. Four conditions defined by HIP temperature, pressure and time were used to HIP the sintered samples with two geometries. The results show that, independent of the HIP conditions used, HIP increased the relative density of the samples to approximately 97.5% and their hardness by 30-50 HV depending on the HIP condition. However, HIP at 1000°C changes the fracture mode of the sintered samples from ductile to brittle.

Densification Process and Properties of Powder Metallurgy Ti-5Al-2.5Sn Alloy

2014 ◽  
Vol 552 ◽  
pp. 278-282 ◽  
Author(s):  
Lei Xu ◽  
Rui Peng Guo ◽  
Jia Feng Lei ◽  
Rui Yang
Keyword(s):  
Titanium Alloy ◽  
Powder Metallurgy ◽  
High Performance ◽  
Hot Isostatic Pressing ◽  
Shielding Effect ◽  
Element Analysis ◽  
Near Net Shaping ◽  
Viable Approach ◽  
Net Shaping ◽  
Powder Compacts

Net shape process from pre-alloyed powder has become a viable approach to manufacture high-performance, complex shaped titanium alloy components. In this work densification of Ti-5Al-2.5Sn powder compacts in mild steel containers by means of hot isostatic pressing was studied. Due to the shielding effect of the container, inhomogeneous deformation of Ti-5Al-2.5Sn powder compacts was observed during the experiment and this was also predicted by a finite element analysis. The mechanical properties of powder metallurgy (PM) Ti-5Al-2.5Sn alloy of different density were compared. Near-net-shape forming processes of PM titanium alloy parts are studied. By using metal capsules and metal internal tooling, near-net-shaping of PM parts with complex shapes was demonstrated. The design of capsules and tooling was found very important because of the different shrinkage ratio of the differently shaped regions of the component.

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