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Thursday, November 26, 2020 | History

4 edition of Weldability of a nickel-based superalloy found in the catalog.

Weldability of a nickel-based superalloy

Weldability of a nickel-based superalloy

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Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, D.C.], [Springfield, Va .
Written in English


Edition Notes

Other titlesWeldability of a nickel based superalloy.
StatementJoseph M. Kalinowski.
SeriesNASA contractor report -- 195376., NASA contractor report -- NASA CR-195376.
ContributionsUnited States. National Aeronautics and Space Administration.
The Physical Object
FormatMicroform
Pagination1 v.
ID Numbers
Open LibraryOL16982070M
OCLC/WorldCa32290664


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Weldability of a nickel-based superalloy Download PDF EPUB FB2

Welding Metallurgy and Weldability of Nickel-Base Alloys describes the fundamental metallurgical principles that control the microstructure and properties of welded Ni-base alloys.

It serves as a practical how-to guide that enables engineers to select the proper alloys, filler metals, heat treatments, and welding conditions to ensure that failures are avoided during fabrication Cited by: title = {Weldability of a nickel-based superalloy.

abstractNote = {The electron beam welding process is used to investigate the weldability of the Ni-based superalloy Udimet LI. This is a modified form of the alloy Udimetwhich has reduced concentrations of interstitial elements such as boron, silicon, and carbon.

Abstract The electron beam welding process is used to investigate the weldability of the Ni-based superalloy Udimet U. This is a modified form of the alloy Udimetwhich has reduced concentrations of interstitial elements such as boron, silicon, and Size: 7MB.

Allvac RTM PLUS(TM) ( Plus) is a new Ni-base superalloy developed to be used in land and aero gas turbine applications. Plus was developed to. Weldability and weld performance of candidate nickel based superalloys for advanced ultrasupercritical fossil power plants Part II: weldability and cross-weld creep performance.

Science and Technology of Welding and Joining: Vol. 21, No. 5, pp. Cited by:   The influence of chemical composition in terms of i.e. hardening elements and impurities, microstructure of base material and weld zone, together with welding processes and corresponding parameters and heat input are discussed and related to the cracking susceptibility of different nickel based : Joel Andersson.

Hydrogen embrittlement (HE) is the deterioration of structural properties of solid metals due to the presence of hydrogen. Alloy nickel-based superalloy is widely used in intense environments due to its excellent mechanical properties.

This book is dedicated to Jackie Kiser, my friend, my spiritual partner, and my co - worker in all that I set out to do. of welding metallurgy and weldability of nickel and nickel alloys.

This book focuses on the metallurgical behavior of Ni - base alloys with. the weldability of precipitation hardened superalloys from a metallurgical standpoint. Two newly developed superalloys Allvac ® Plus TM and Haynes ® ® are compared with the two well established Alloy and Waspaloy.

The ability of Ni-base alloys to be joined by welding processes and to perform as intended in their service environment describes their ‘weldability.’ Testing procedures are available that can evaluate weldability so that proper material or process selection can be implemented during fabrication and repair.

The principal limitation of today’s Ni- and Fe-based superalloys continues to be their susceptibility to intergranular degradation arising from creep, hot corrosion, and fatigue.

Many precipitation-strengthened superalloys are also difficult to weld, owing to the formation of heat-affected zone (HAZ) cracks during postweld heat treatments (PWHTs). The present work Cited by: A STUDY OF LASER WELDABILITY OF IN NICKEL-BASED SUPERALLOY IN A NEW PRE-WELD HEAT TREATMENT CONDITION BY JOHNSON OLUBAYO AINA A thesis submitted to the Faculty of Graduate Studies in partial fulfillment of the requirements for the Degree of MASTER OF SCIENCE Department of Mechanical and Manufacturing Engineering.

Thus, a superalloy operating at °C in the vicinity of the melting temperature of nickel, °C, working at a τ of ( + )/( + ) ~is classified as a high-temperature material.

But so is ice moving in a glacier field at –10 °C, since τ is / ~although its temperature is substantially lower. The weldability of nickel-based superalloys is significantly better than that of other metals and alloys.

This may be attributed to the material’s elevated creep resistance and high yield strength. Examples of nickel-based superalloys.

Here are some commonly used nickel-based superalloys available in the market. The partitioning and site preference of rhenium or ruthenium in model nickel-based superalloys: An atom-probe tomographic and first-principles study.

Cited by: A superalloy, or high-performance alloy, is an alloy with the ability to operate at a high fraction of its melting point. Several key characteristics of a superalloy are excellent mechanical strength, resistance to thermal creep deformation, good surface stability, and resistance to corrosion or oxidation.

The crystal structure is typically face-centered cubic (FCC) austenitic. Presents all the main aspects of the microstructure of nickel-base superalloys, and includes micrographs chosen from among a large range of commercial and academic alloys, from the as-cast product to in-situ components, worn from in-service use.

Including more than illustrations, the text explains all the transformation mechanisms involved in the origination 3/5(1). Superalloy development has been driven primarily by the aerospace and power industries.

This compilation of papers from the Twelfth International Symposium on Superalloys, held from September, offers the most recent. Welding and weldability of nickel base alloys will be discussed in a two part paper. In this paper, the primary focus will be on the fundamentals of welding and weldability of Ni base superalloys.

Keywords: Austenitic steels, Advanced ultrasupercritical, Phase stability, Corrosion, WeldabilityCited by:   Development of a Low‐Density Rhenium‐Free Single Crystal Nickel‐Based Superalloy by Application of Numerical Multi‐Criteria Optimization Using Thermodynamic Calculations (Pages: ) Ralf Rettig.

Nickel-based superalloy is the most used material in turbine engines because of its high strength and long fatigue life combined with good resistance to oxidation and corrosion at high temperature. Nickel-based superalloy is the material of choice for the hottest engine components that are required to operate above °C.

Welding the Inconel Superalloy: Reduction of Micro-segregation and Laves Phases explores the day-to-day welding business in Alloy and presents solutions to avoid or minimize micro-segregation. It considers the limitations of changing from lab scale models to actual production models and presents new technologies with proven experimental background.

The most up-to-date coverage of welding metallurgy aspects and weldability issues associated with Ni-base alloys Welding Metallurgy and Weldability of Nickel-Base Alloys describes the fundamental metallurgical principles that control the microstructure and properties of welded Ni-base alloys.

It serves as a practical how-to guide that enables engineers to select the proper. Effect of notches on creep-fatigue behavior of a P/M nickel-based superalloy / by: Telesman, Jack, Published: () Tensile properties of weldments in alloy GTD / by: Miner, R.

V., et al. Published: (). Welding and weldability of nickel-base superalloys News från Development of weldability assessment and understanding of hot cracking in boiler and gas turbine materials, KME Dela på Facebook Dela på Twitter Dela på LinkedIn.

The most important results so far are related to the hot cracking study on cast alloy Comparison of a high-activity coating (left) with a low-activity coating (right) on a nickel-based superalloy substrate (PWA ) Such coatings can be applied even inside of pipes.

In this case, the tube is filled with the powder mixture and then sealed at the ends. The tube represents both the container and the part to be by: 6. Get this from a library. Weldability of a nickel-based superalloy.

[Joseph M Kalinowski; United States. National Aeronautics and Space Administration.]. The integrity of nickel-base superalloy single-crystal welds depends on the weld cracking tendency, weld metal dendrite selection process, stray crystal formation, and macro- and microstructure development.

These phenomena have been investigated in commercial nickel-base superalloy single crystal by: 3. SUPERALLOYS, THE MOST SUCCESSFUL ALLOY SYSTEM OF MODERN TIMES - PAST, PRESENT AND FUTURE Art Kracke Vice President Business Technology ATI Allvac Abstract The deep roots of superalloys go back toalthough the term ‘super-alloy’ is believed to have first been used in the mid s to refer to cobalt-base alloys such as Vitallium and File Size: 1MB.

T.J. Kelly, Welding metallurgy of investment cast nickel-based superalloys, Weldability of Materials Fissuring in INCONEL type Superalloy" S. Benhaddad, N.L. Richards, U. Prasad, H. Guo and M.C. Chaturvedi SuperalloysWarrendale, PA: TMS,p.

Read the Full Article "A Process Model for the Distortion Induced by the Electron- Beam Welding of a Nickel-Based Superalloy". Abstract: Components of gas turbines must be extremely resistant to high temperatures, high stresses, high-temperature corrosion, and erosive environments. The materials used in these environmental conditions are mainly nickel-based superalloys.

In this study, the low-cycle fatigue of the nickel-based superalloy Inconel was examined. The example of σ phase shown in Fig. 11 was found to be Cr, Mo and Co based chemistry after a thermal exposure at °C for 1, hours in a newly developed advanced Ni superalloy. The second phases introduced above and some other important second phases for the Ni superalloy microstructure are summarized in Table by: 8.

Abstract. The electron beam welding process is used to investigate the weldability of the Ni-based superalloy Udimet LI.

This is a modified form of the alloy Udimetwhich has reduced concentrations of interstitial elements such as boron, silicon, and : Joseph M.

Kalinowski. Superalloys and in particular the precipitation hardened Ni-based superalloys have always been used extensively in the hot sections of jet engines.

Large hot structural engine components with complex geometry have preferably been cast as single piece components since the large scale vacuum investment casting process became available about fifty years ago.

4. Chemical Composition Commercial Nickel Based Superalloys include more than just Ni. Most nickel-based alloys contain % Cr, up to 8% Al and Ti, % Co, and small amounts of B, Zr, and C. Other common additions are Mo, W, Ta, Hf, and Nb. Weldability is improved bo:h as mea­ sured by the Varestraint test and in field trials of the alloy in comparison to Alloy The absence of Fe in this nickel-based superalloy reduces the amount of Laves phase that forms on solidification either during casting or welding.

Since little Laves phase forms during the weld solidificationFile Size: KB. Homogenization of Precipitation Hardening Nickel Based Superalloys Nyckelord Allvac Plus, HaynesSuperalloys, Homogenization Sammanfattning Allvac Plus and Haynes are relatively new precipitation hardening nickel based superalloys with good high temperature mechanical properties.

In addition, the weldability of these superalloysFile Size: 2MB. Crack-free Hastelloy X fabricated through laser powder bed fusion (LPBF) from powder with a standard chemical composition is reported.

Electron backscatter diffraction (EBSD) analysis evidenced columnar grains parallel to the building direction. The typical LPBF columnar dendrite microstructure was found to be finer than reported elsewhere. Mo-enriched carbides (~50 nm), Cited by: 7. Microstructure and Properties of Nickel - Based Superalloy C Pulse Laser Weld Joints Based on mm Thickness To cite this article: Junchao Wang et al IOP Conf.

Ser.: Mater. Sci. Eng. View the article online for updates and enhancements. This content was downloaded from IP address on 07/04/ at. Weldability of Ni-Based Superalloys Waspaloy®: and Haynes®: ®: A Study Performed with Varestraint Testing Jacobsson J 1,2, Andersson J 3 *, Brederholm A 4 and Hänninen H 4.

1 Department of Materials and Manufacturing Technology, Chalmers University of Technology, Gothenburg, Sweden.

2 Research and Technology Department, GKN Aerospace Engine Author: J. Jacobsson, Joel Andersson, Anssi Brederholm, Hannu Hänninen.High temperature creep and dwell-fatigue properties of the new nickel-based superalloy AD™ have been investigated.

Three microstructures have been studied in creep ( °C and °C) and dwell-fatigue ( °C stress control with trapezoidal signals, and dwell times ranging from 1 s to s): a coarse grains microstructure, a fine.Heat affected Zone (HAZ) of TIG welded Ni base GTD superalloys using various filler materials were investigated.

The characterization was done based on microstructure observation and hardness estimation. The micro-hardness mapping indicates that the HAZ’s were restricted to an area within 1mm from the weld junction, independent of filler materials used.