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.

Analysis of a Thixo-Lateral Forged Spindle from LTT C45, LTT C38 and LTT 100Cr6 Steel Grades

2014 ◽  
Vol 217-218 ◽  
pp. 347-354 ◽  
Author(s):  
Jokin Lozares ◽  
Zigor Azpilgain ◽  
Iñaki Hurtado ◽  
Iñigo Loizaga
Keyword(s):  
Mechanical Properties ◽  
Current Trend ◽  
Research Work ◽  
Raw Material ◽  
Key Factor ◽  
Steel Grades ◽  
Near Net Shape ◽  
Net Shape Forming ◽  
Near Net Shaping ◽  
Net Shaping

Due to the current trend in prices of raw material and their sources, near net shaping of mechanical components will become a key factor for the companies to get the desired competitiveness. Semisolid metal (SSM) forming is one of those near net shape forming techniques revealing a high potential to reduce material as well as energy consumption compared to conventional process technologies. Thus, the aim of this research work is to demonstrate the above by manufacturing a steel commercial automotive spindle by thixo-lateral forming from three different steel grades. The starting material, the microstructure and mechanical properties are analysed along the article. Material savings of 20% have been reported together with a substantial decrease of the forming forces. In addition, great mechanical properties have been achieved which brings the process closer to the desired final industrial application.

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 316L WAAM and pressure machining influence

2021 ◽  
Author(s):  
Xinfeng Kan ◽  
Dengcui Yang ◽  
Zhengzhi Zhao ◽  
Jiquan Sun
Keyword(s):  
Mechanical Properties ◽  
316L Stainless Steel ◽  
Additive Manufacture ◽  
Arc Voltage ◽  
Large Size ◽  
Complex Shapes ◽  
Rolling Experiment ◽  
Arc Current ◽  
Favorable Conditions

Abstract Wire arc additive manufacture (WAAM) technology has a good development prospect, and can be used to manufacture large metal components with complex shapes in combination with traditional machining equipment. This paper adjusts the parameters from the perspective of heat input and arc control. It is found that the stacking quality of 316L stainless steel is the best when the arc voltage is 40V and the arc current is 360A. It is proposed to obtain the flat layers by pressure machining after every layer is stacked, which can create favorable conditions for manufacturing large-size components. And through the hot rolling experiment, it is proved that pressure machining can improve the density and uniformity of the microstructure, and thus enhance the comprehensive mechanical properties of components built by WAAM.

Zamak 2 Alloy Produced by Mechanical Alloying and Consolidated by Sintering and Hot Pressing

2017 ◽  
Vol 139 (9) ◽  
Author(s):  
Flávia Costa da Silva ◽  
Kamila Kazmierczak ◽  
César Edil da Costa ◽  
Júlio César Giubilei Milan ◽  
José Manuel Torralba
Keyword(s):  
Mechanical Properties ◽  
Mechanical Alloying ◽  
Hot Pressing ◽  
High Energy ◽  
Zinc Alloy ◽  
Stable Phase ◽  
Phase Stabilization ◽  
Near Net Shaping ◽  
Net Shaping ◽  
Additional Phase

The Zamak 2 alloy has the best mechanical properties of the Zamak alloys with respect to the tensile strength, creep resistance, and hardness. Zamak 2 is a commercial material widely used for the manufacturing of mechanical components. The presence of Cu in this alloy (3 wt. %) improves the mechanical properties through the formation of E (CuZn4) precipitates. The powder metallurgy (P/M) has an important direct advantage in the fabricated parts with respect to the finished dimensions or near net shaping due to the additional phase stabilization without heat treatment. However, there are few studies into the production of this zinc alloy via mechanical alloying and the effect of the consolidation technique in terms of the material properties; these research deficiencies led to the development of this work. The powder was analyzed during milling until achieving a steady-state, which occurred after 30 h of milling in a planetary ball mill at 400 rpm. The high-energy milling produces a Zamak 2 alloy powder with a T′ stable phase and with a greater melting point. When consolidated using hot pressing, the hardness increases compared to sintering and casting alloy.

scholarly journals On the advances to obtain excellent and repeatable mechanical properties and build quality of LaserForm® Ti gr23 (A) across whole build platform

2020 ◽  
Vol 321 ◽  
pp. 03015
Author(s):  
Anthony Beckers ◽  
Gokula Krishna Muralidharan ◽  
Karel Lietaert ◽  
Nachiketa Ray ◽  
Pierre Van Cauwenbergh ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Gas Flow ◽  
Hot Isostatic Pressing ◽  
Fatigue Properties ◽  
Powder Bed ◽  
Part Quality ◽  
Metal Printing ◽  
Wide Range ◽  
Better Than

Direct Metal Printing (DMP) or Laser Based Powder Bed Fusion (L-BPF) enables manufacturing of highly complex geometries which are used in a wide range of applications - healthcare to aerospace. Producing these products with excellent and consistent part quality in terms of density and mechanical properties is key. DMP ProX® 320 machine has been used for over 10 years for this purpose. In this study, the key improvements made on the process stability for targeting consistent build quality across build platform and repeatability have been evaluated. The quality is assessed by determining the density, mechanical properties and surface roughness of direct metal printed LaserForm® Ti gr23 (A). The main finding from the study is that the use of the optimized gas flow enables production of LaserForm® Ti gr23 (A) with consistent and improved mechanical properties across the whole build platform. Moreover, there is no need any more for hot isostatic pressing to ensure good fatigue properties. The elongation strain to failure increased by 15 % to 20 %, which is 4-5 % higher than ASTM F3001 specifications. The axial fatigue limit (5x106 loading cycles) was 637 MPa (R=0.1), which is as good as or even better than annealed wrought Ti6Al4V.

Comparing the SEED Semi-Solid Process to Low Pressure Permanent Mould in the Production of 4mm Thick Aluminum A356 Covers

2013 ◽  
Vol 765 ◽  
pp. 112-116
Author(s):  
Franco Chiesa ◽  
David Levasseur ◽  
Jocelyn Baril
Keyword(s):  
Mechanical Properties ◽  
Casting Process ◽  
Low Pressure ◽  
Pouring Temperature ◽  
Sequence Production ◽  
Filling Sequence ◽  
Near Net Shape ◽  
Semi Solid ◽  
Filling And Solidification

In order to compare the semi-solid SEED casting process to the Low Pressure Permanent Mould process (LPPM), the same part has been produced in aluminium A356 (AlSi7Mg04) using the two methods. The processes were first compared from an operational standpoint: pouring temperature, filling sequence, production rate and mould maintenance. In addition, the metallurgical quality of the castings was evaluated by measuring the tensile properties at 6 locations in the part; the metallographic structures were also compared. Filling and solidification modeling allowed the prediction of the filling sequence and local solidification times everywhere in the casting. The SEED process was generally found to deliver a finer structure, a near net shape casting and a much higher productivity. LPPM parts were more uniform in structural and mechanical properties as verified at 6 locations in the castings.

Near Net-Shape Forming of Thermal Barrier Coated Components for Gas Turbine Engine Applications

1998 ◽  
Author(s):  
G.E. Kim ◽  
P.G. Tsantrizos ◽  
S. Grenier ◽  
A. Cavasin ◽  
T. Brzezinski
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Gas Turbine ◽  
Bond Coat ◽  
Gas Turbine Engine ◽  
Thermal Barrier ◽  
Forming Process ◽  
Turbine Engine ◽  
Near Net Shape ◽  
Net Shape Forming

Abstract PyroGenesis Inc. has developed a unique Vacuum Plasma Spraying (VPS) near-net-shape forming process for the production of multilayered free-standing components. Initial evaluation on the feasibility of applying this process for the production of gas turbine engine components has been performed. The VPS near-net-shape forming process consists of: selecting an appropriate mold material; preconditioning of mold surface ; depositing metallic, ceramic, or composite layers ; and removing mold from the spray-formed structure. The near-net-shape components are heat treated to improve their mechanical properties. A suitable heat treatment cycle was developed for the VPS-applied superalloy. Much of the recent improvements in gas turbine engine performance has been attributed to the introduction of thermal barrier coatings (TBC) for superalloy components. There exist, however, some limitations in current fabrication methods for closed hot-section components: less than ideal coating quality; welding; limited choice of superalloy material; etc... PyroGenesis has used VPS near-net-shape forming to fabricate closed components with an yttria-stabilized-zirconia inner layer, CoNiCrA1Y bond coat, and IN-738LC outer layer. The results from the initial study demonstrate the feasibility of producing near-net-shape components with good coating structures, superior superalloy materials, and the absence welds. The mold was reusable after minor surface conditioning. The TBC showed uniform thickness and microstructure with a smooth surface finish. The bond coat and structural superalloy layers were very dense with no signs of oxidation at the interface. After heat treatment, the mechanical properties of the IN-738LC compare favourably to cast materials.

scholarly journals Biomechanical properties of the rectovaginal fascia. Is it really a fascia?

2011 ◽  
Vol 25 (1) ◽  
pp. 11
Author(s):  
Karin Glavind ◽  
Janus Bo Jespersen ◽  
Mikkel Seyer-Hansen
Keyword(s):  
Mechanical Properties ◽  
Mechanical Strength ◽  
Mechanical Testing ◽  
Biomechanical Properties ◽  
Abdominal Hysterectomy ◽  
Collagen Content ◽  
Significant Difference ◽  
Testing And Measurement ◽  
Abdominal Fascia

<em>Background</em>. The aim of this study was to find out whether the rectovaginal fascia was really a true fascia by comparing the mechanical properties and collagen content of the rectovaginal fascia in women operated for rectoceles to the abdominal fascia in patients having an abdominal hysterectomy. <em>Materials and Methods</em>. Thirty patients were included. During operation for rectocele or hysterectomy a biopsy measuring 8 x 15 mm was taken from the rectovaginal fascia or abdominal fascia. Mechanical testing and measurement of collagen content was performed. <em>Results</em>. A significant difference in mechanical strength of the tissue was found. If, however, the strength was corrected for collagen content there was no difference between the two groups. <em>Conclusion</em>. The quality of collagen was comparable in the two groups. This adds further evidence to the existence of a distinct rectovaginal fascia.

Sign in / Sign up

Export Citation Format

Share Document