Near net shape processing by a colloidal process route

1998 ◽  
Vol 53 (7-8) ◽  
pp. 46
Author(s):  
D. Stover
Keyword(s):  
Process Route ◽  
Shape Processing ◽  
Near Net Shape

Studies on Softening Kinetics of Niobium Microalloyed Steel Using Stress Relaxation Technique

2012 ◽  
Vol 715-716 ◽  
pp. 794-799 ◽  
Author(s):  
Cheng Liang Miao ◽  
Cheng Jia Shang ◽  
Guo Dong Zhang ◽  
Guo Hui Zhu ◽  
Hatem S. Zurob ◽  
...  
Keyword(s):  
Stress Relaxation ◽  
Microalloyed Steels ◽  
Distinct Advantage ◽  
Low Carbon ◽  
Shape Processing ◽  
Physically Based ◽  
Near Net Shape ◽  
Niobium Microalloyed Steel ◽  
Relaxation Curves ◽  
Kinetics Of

Stress relaxation was studied in a series of low carbon, high Mn microalloyed steels containing 0.012, 0.06 and 0.1 wt% Nb. The stress-relaxation curves were modeled using a physically-based model that takes into account the time evolution of precipitation, recovery and recrystallization as well as their interactions. The results confirm that high Mn-high Nb design can offer distinct advantage over the low-Mn design for the application of near net shape processing.

Lectinhistochemistry Evaluation of Bone after Implantation with Macroporous Titanium Samples

2012 ◽  
Vol 77 ◽  
pp. 190-195 ◽  
Author(s):  
Kalan Bastos Violin ◽  
Tamiye Simone Goia ◽  
José Carlos Bressiani ◽  
Ana Helena de Almeida Bressiani
Keyword(s):  
Healing Process ◽  
High Vacuum ◽  
High Specificity ◽  
Membrane Glycoproteins ◽  
Bone Implant ◽  
Femur Bone ◽  
Shape Processing ◽  
Near Net Shape ◽  
13Zr Alloy ◽  
Molecular Evaluation

Titanium and its alloys are widely used as biomaterials and interact well with bone tissue. In order, to evaluate more than just morphological osseointegration by histological slides the work aimed to approach a molecular evaluation of bone-implant using lectinhistochemistry (LHC), which binds with high specificity carbohydrates (sugar residues) presents in membrane glycoproteins with the use of lectins. The implanted samples were obtained by powder metallurgy, Ti-13Nb-13Zr alloy with and without gelatin. Pores were achieved by adding gellatin 5 wt% to the hydrogenated metallic powder, after near net shape processing, the samples were thermal treated in vacuum (300 °C/90min) and sintered in high-vacuum (1150 °C/14h). The samples were characterized for porosity (~30%), and subsequently were implanted in rat’s femur bone. After 4 weeks of healing process, bone with implant were sampled to perform LHC in paraffin embedded tissue in histological slides using the lectins PNA, UEA-1, WGA, sWGA and RCA-1. All samples osseointegrated well with the bone, no fibrous capsule was present in the bone which was in contact with the implant. With the molecular approach of osseointegration, adjustments in the processing and structure of macroporous titanium based implants can be performed to achieve friendly structure.

Development of a Near Net Shape Processing Method for Rhenium Using Directed Light Fabrication

1998 ◽  
Vol 13 (5) ◽  
pp. 719-730 ◽  
Author(s):  
John O. Milewski ◽  
Dan J. Thoma ◽  
Joe C. Fonseca ◽  
Gary K. Lewis
Keyword(s):  
Processing Method ◽  
Shape Processing ◽  
Near Net Shape

Comparison of Cast and Extruded Stock for the Forging of AA6082 Alloy Suspension Parts

2014 ◽  
Vol 939 ◽  
pp. 299-304 ◽  
Author(s):  
Yucel Birol ◽  
Onur Ilgaz ◽  
Seracettin Akdi ◽  
Erdem Unuvar
Keyword(s):  
Automotive Industry ◽  
High Strength ◽  
Direct Chill ◽  
Grain Structure ◽  
Casting Technique ◽  
Process Route ◽  
Low Weight ◽  
Coarse Surface ◽  
Near Net Shape ◽  
Improve Fatigue

High-precision near-net shape parts with excellent surface qualities can be produced with the forging process with a minimum of finishing operations thanks to the good formability of aluminium alloys. There has been a rapid increase in the use of aluminium forgings predominantly in the automotive industry, where weight savings for reduced fuel consumption and exhaust emissions is mandated by legislation. Aluminium forgings provide, in addition to low weight, high strength, good corrosion resistance and a fibrous grain structure to improve fatigue resistance. Typical commercial forging stock is the round bars produced by the extrusion of cast billets. An alternative process route that has received increasing attention in recent years is the casting of forging stock by a horizontal direct chill casting technique to make smaller billets without the need for extrusion to reduce their diameter. The anisotropy imparted to the forging stock via extrusion, often regarded as useful for the forging, is certainly missing in the former. However, cast stock has been reported to be more resistant to the formation of coarse surface grains than the extruded counterpart. The present work was undertaken to compare the casting and extrusion routes for the manufacture of 6082 alloy forging stock.

Cost Effective Forging of Titanium Alloy Parts and their Mechanical Properties

2014 ◽  
Vol 1019 ◽  
pp. 3-10 ◽  
Author(s):  
Brian Gabbitas ◽  
Fei Yang ◽  
Stella Raynova ◽  
Ming Tu Jia
Keyword(s):  
Mechanical Properties ◽  
Powder Compact ◽  
Phase Distribution ◽  
Cost Effective ◽  
Beta Phase ◽  
Point Of View ◽  
Protective Atmosphere ◽  
Shape Processing ◽  
Near Net Shape ◽  
The Right

Both open die and closed die powder compact forging can be used for the consolidation of Ti and pre-alloyed Ti 6Al 4V powders produced by a hydride-dehydride (HDH) process. The approach used is initial cold or warm compaction into cylindrical shapes, or into a specific pre-form shape appropriate for achieving a particular final forged shape. The economic benefit is near net-shape processing with minimum machining required after forging. Manufacturing costs are also minimised by forging a compact, with a sufficiently high enough density, in air, without a protective atmosphere. The challenge, from a manufacturing point of view, is the operation of a manufacturing route which gives rapid and qualified compaction to meet production demands and batch sintering to achieve a high enough density prior to final forging to shape. In addition to this the final product has to have the right level of mechanical properties. This paper reviews some key findings from powder compact production, through to sintering and forging. These will be presented in terms of alpha-beta phase distribution in the microstructure, the degree of porosity, heat treatment and their effects on mechanical properties.

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