Search Results for powder metallurgy

Powder metallurgy offers distinct advantages for the production of certain alloys. The degree to which contents of the alloy may be prescribed represents tremendous potential and supports alloy use in new applications. However, robust testing of powder metallurgy alloys is required to assess their potential and quality. Fatigue testing via the resonance principle enables metallurgists to achieve greater throughput in testing programs, while novel hardness testing platforms support analysis of individual phases in porous powder metallurgy specimens.

This article, the first in a two-part series, explains how powder metallurgy presents a cost-effective alternative to conventional titanium fabrication processes. It reviews the characteristics of different types of titanium powders and compares and contrasts near-net shape (NNS) production techniques, including conventional press-and-sinter, cold isostatic pressing (CIP), hot isostatic pressing (HIP), CIP-sinter, and CIP-sinter-HIP (CHIP). Other titanium production methods are covered in Part 2, which is scheduled for the October 2012 issue of AM&P .

This article is the second in a two-part series on cost-saving methods for the production of titanium components. Part 1, published in the September 2012 issue of AM&P , covered a number of powder metallurgy techniques, including press-and-sinter and both cold and hot isostatic pressing. Other near-net shape processes are described here, including additive layer manufacturing (ALM), metal injection molding (MIM), and spray deposition (SD). Examples are also given showing how titanium PM parts compare with cast and wrought components.

A look at the growth and longevity of a powder metallurgy company along with its historic beginnings as a producer of sponge iron powder utilizing tunnel kiln technology.

A hydrogen gas generator plant offers a flexible hydrogen supply solution to the powder metallurgy industry. This article provides an overview of a unique steam methane reformer that uses an integrated heat recovery system to reduce the cost and improve the reliability of hydrogen gas supply.

A powder metallurgy and hot isostatic pressing technology offers a new way to manufacture high pressure-retaining components for use in the power-generation industry.

Development of wear-resistant hardfacing materials using powder metallurgy/hot isostatic pressing technology offers an alternative to today's cobalt-based materials and those that suffer delamination damage. Ongoing research and development at the Electric Power Research Institute (EPRI), detailed in this article, examines the application of wear-resistant hardfacing materials using the PM/HIP process. The hope is to eliminate weldability and residual stress challenges associated with some hardfacing alloys, as well as to provide a wider range of potential alloy solutions to reduce cobalt use and to address delamination issues with incumbent materials.

Although the widespread use of titanium alloys is constrained by high costs, powder metallurgy techniques such as additive manufacturing (AM) represent an economical approach to fabricating titanium components. Various approaches to AM, along with examples of components made by different AM processes, are presented. The microstructures and mechanical properties of Ti-6Al-4V produced by AM are also discussed and compared with cast and wrought products. Finally, the economic advantages of AM compared to conventional processing are presented.

Field assisted sintering technology (FAST) enables hybrid components for aerospace to be designed with reduced weight and without sacrificing performance. FAST can be used to produce metal, ceramic, and composite components with tailored properties via a powder metallurgy approach. In many cases, it is a one-step, cost-effective manufacturing process for production of net-shape components.

Accurate and continuous dew point measurement is key to maintaining the atmosphere required to achieve high quality and consistency of sintered products in powder metallurgy processing.

High-strength, corrosion-resistant steel is proposed as a cost-effective alternative to titanium alloys due to its high specific strength, high fatigue strength, good toughness, and corrosion resistance.

New methods for processing titanium alloys offer the potential to enhance mechanical properties while reducing component cost. This article discusses innovative and potentially lower cost fabrication processes including additive manufacturing (AM), superplastic forming/diffusion, hot isostatic pressing (HIP) near-net shapes from prealloyed powder, injection molding, rapid solidification, mechanical alloying, and thermohydrogen processing.

Among the structural materials developed in the 20th century, titanium and its alloys have played a leading role in improving component performance. This article discusses development of new production techniques, specifications, economic aspects, and applications that have enabled the current applications of titanium alloys.

News about ASM members, chapters, events, awards, conferences, affiliates, and other society activities. Topics include: ASM Materials Education Foundation 2013 Scholarship Winners; Jacquet-Lucas Award for Excellence in Metallography; Fashion Forward Micrograph; New Micrograph Tie and Scarf; Zinkle, Seetharaman Named Editors for Metallurgical and Materials Transactions; and Emerging Professionals: Engaging Young Professionals in Your Local Chapter.

News about ASM members, chapters, events, awards, conferences, affiliates, and other society activities. Topics include: nomination of ASM officers; winners of 2012 student chapter grants.

Thixoforming is a hybrid technology used to manufacture net shape components from a variety of alloys ranging from low melting temperature aluminum and magnesium to steel and Co-base alloys.

Newly developed nickel-titanium (NiTi) alloys are well suited for bearings and gears in demanding applications.

An investigation into the chemistry and type of tungsten carbide powder used for drill bits has yielded a material with improved transverse rupture strength and interesting microstructural response to thermal cycling.

Led by the National Research Council of Canada (NRC), the Cold Spray Additive Manufacturing (CSAM) industrial R&D group brings together the technology supply chain, end users, and OEMs in an effort to develop and adapt cold spray for additive manufacturing and demonstrate feasibility for targeted applications.

As powder-based additive manufacturing (AM) processes continue to mature, reliable powder characterization techniques will be key to optimizing both AM processes and final part performance. This article describes advanced metals for assessing powder properties and their influence on AM processing and part performance.