Download or read book Effects of the Laser Beam Powder Welding Process on the Hardenability of Superalloy IN 738LC Deposition Welds written by José Humberto García Buitrago and published by . This book was released on 1995 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Masters Abstracts International written by and published by . This book was released on 1996 with total page 880 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Metals Abstracts written by and published by . This book was released on 1998 with total page 1042 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Case Study on Laser Beam Welding of Super Alloy 625 and Other Alloys written by Akshansh Mishra and published by Createspace Independent Publishing Platform. This book was released on 2018-03-25 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with the Laser Beam Welding process and its Applications.

Download or read book A Fundamental Study of Laser Beam Welding Aluminum Lithium Alloy 2195 for Cryogenic Tank Applications written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-06 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on the potential for decreasing costs of joining stiffeners to skin by laser beam welding, a fundamental research program was conducted to address the impediments identified during an initial study involving laser beam welding of aluminum-lithium alloys. Initial objectives of the program were the identification of governing mechanism responsible for process related porosity while establishing a multivariant relationship between process parameters and fusion zone geometry for laser beam welds of alloy 2195. A three-level fractional factorial experiment was conducted to establish quantitative relationships between primary laser beam processing parameters and critical weld attributes. Although process consistency appeared high for welds produced during partial completion of this study, numerous cracks on the top-surface of the welds were discovered during visual inspection and necessitated additional investigations concerning weld cracking. Two experiments were conducted to assess the effect of filler alloy additions on crack sensitivity: the first experiment was used to ascertain the effects of various filler alloys on cracking and the second experiment involved modification to process parameters for increasing filler metal dilution. Results indicated that filler alloys 4047 and 4145 showed promise for eliminating cracking. Martukanitz, R. P. and Jan. R. Langley Research Center...

Download or read book Properties of Laser Beam Welded Superalloys Inconel 625 and 718 written by and published by . This book was released on 1999 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Welding Metallurgy and Weldability of Nickel Base Alloys written by John C. Lippold and published by John Wiley & Sons. This book was released on 2011-09-20 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 alloys, filler metals, heat treatments, and welding conditions to ensure that failures are avoided during fabrication and service. Chapter coverage includes: Alloying additions, phase diagrams, and phase stability Solid-solution strengthened Ni-base alloys Precipitation strengthened Ni-base alloys Oxide dispersion strengthened alloys and nickel aluminides Repair welding of Ni-base alloys Dissimilar welding Weldability testing High-chromium alloys used in nuclear power applications With its excellent balance between the fundamentals and practical problem solving, the book serves as an ideal reference for scientists, engineers, and technicians, as well as a textbook for undergraduate and graduate courses in welding metallurgy.

Download or read book The Effect of Laser Welding Process Parameters on the Mechanical and Microstructural Properties of V 4Cr 4Ti Structural Materials written by and published by . This book was released on 2000 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper reports on a systematic study which was conducted to examine the use of a pulsed Nd:YAG laser to weld sheet materials of V-Cr-Ti alloys and to characterize the microstructural and mechanical properties of the resulting joints. Deep penetration and defect-free welds were achieved under an optimal combination of laser parameters including focal length of lens, pulse energy, pulse repetition rate, beam travel speed, and shielding gas arrangement. The key for defect-free welds was found to be the stabilization of the keyhole and providing an escape path for the gas trapped in the weld. An innovative method was developed to obtain deep penetration and oxygen contamination free welds. Oxygen and nitrogen uptake were reduced to levels only a few ppm higher than the base metal by design and development of an environmental control box. Effort directed at developing an acceptable postwelding heat treatment showed that five passes of a diffuse laser beam over the welded region softened the weld material, especially in the root region of the weld.

Download or read book A Study of Laser Weldability of IN 738 Nickel based Superalloy in a New Pre weld Heat Treatment Condition written by Johnson Olubayo Aina and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new pre-weld heat treatment was developed recently for IN 738 superalloy. Therefore, the research described in this master's thesis was to study the laser weldability improvement of the alloy which had undergone the new heat treatment, FUMT and the results were compared to an existing pre-weld heat treatment, solution heat treatment (SHT). Also, thermomechanical fatigue (TMF) behavior of the welded alloy was investigated. The results showed that IN-738 welded in FUMT condition had about 70% reduction in weld cracking compared to SHT treated alloy. TMF tests showed that at higher strain ranges, the TMF life of the samples of the alloy welded in FUMT condition is comparable to unwelded samples, while at lower strain ranges, welded samples of the alloy in FUMT condition has a higher TMF life than unwelded samples. This shows that welding IN 738 superalloy in FUMT does not degrade the TMF performance of the alloy.

Download or read book Superalloys 2012 written by Eric S. Huron and published by John Wiley & Sons. This book was released on 2012-10-02 with total page 952 pages. Available in PDF, EPUB and Kindle. Book excerpt: A superalloy, or high-performance alloy, is an alloy that exhibits excellent mechanical strength at high temperatures. 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 9-13, 2012, offers the most recent technical information on this class of materials.

Download or read book Superalloys written by Matthew J. Donachie and published by ASM International. This book was released on 2002 with total page 439 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers virtually all technical aspects related to the selection, processing, use, and analysis of superalloys. The text of this new second edition has been completely revised and expanded with many new figures and tables added. In developing this new edition, the focus has been on providing comprehensive and practical coverage of superalloys technology. Some highlights include the most complete and up-to-date presentation available on alloy melting. Coverage of alloy selection provides many tips and guidelines that the reader can use in identifying an appropriate alloy for a specific application. The relation of properties and microstructure is covered in more detail than in previous books.

Download or read book Powder Bed Fusion Laser Beam of a Non Weldable Ni based Superalloy written by Ahmed Fardan Jabir Hussain and published by . This book was released on 2024 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Impact Properties and Hardening Behavior of Laser and Electron beam Welds of V 4Cr 4Ti written by and published by . This book was released on 1996 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors are conducting a program to develop an optimal laser welding procedure that can be applied to large-scale fusion-reactor structural components to be fabricated from vanadium-base alloys. Results of initial investigation of mechanical properties and hardening behavior of laser and electron-beam (EB) welds of the production-scale heat of V-4Cr-4Ti (500-kg Heat 832665) in as-welded and postwelding heat-treated (PWHT) conditions are presented in this paper. The laser weld was produced in air using a 6-kW continuous CO2 laser at a welding speed of H"5 mm/s. Microhardness of the laser welds was somewhat higher than that of the base metal, which was annealed at a nominal temperature of H"050°C for 2 h in the factory. In spite of the moderate hardening, ductile-brittle transition temperatures (DBTTs) of the initial laser (H"0°C) and EB (H"0°C) welds were significantly higher than that of the base metal (H"170°C). However, excellent impact properties, with DBTT

Download or read book Powder Metallurgy of Superalloys written by G. H. Gessinger and published by Elsevier. This book was released on 2013-10-22 with total page 363 pages. Available in PDF, EPUB and Kindle. Book excerpt: Powder Metallurgy of Superalloys details the advancement of powder metallurgy in the context of producing superalloys. The book is comprised of nine chapters that cover the underlying principles of superalloys produced through powder metallurgy. The text first covers concerns in pre-alloyed dispersion-free powders, such as powder production and characterization; powder consolidation methods; and quality control and non-destructive evaluation of P/M superalloys. The next chapter talks about oxide-dispersion-strengthened superalloys. Next, the book discusses joining techniques for P/M superalloys and the practical applications of P/M superalloys. The title will be of great use to professionals in the materials manufacturing industry.

Download or read book Laser Powder Bed Fusion of Precipitation hardened Rene 41 and Rene 77 Nickel Base Superalloys written by Sila Atabay and published by . This book was released on 2022 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "Laser powder bed fusion (LPBF) is a promising technology that enables production of complex parts with unique freedom in design and short lead times. For applications requiring high strength and high temperature resistance, Ni-base superalloys are the primary choice of materials. Although variety of superalloys can be produced through LPBF, most high strength alloys are prone to cracking and considered difficult to weld. The main objective of this research is to assess the processability of precipitation hardenable Ni-base superalloys by LPBF. For this purpose, processing of two different precipitation hardenable alloys, Rene 41 (R41) having a fair weldability and Rene 77 (R77) categorized as difficult to weld, are studied along with their microstructural development and mechanical properties. First, R41 alloy was produced by LPBF, and its microstructural evolution was investigated. Crack-free, dense samples were produced upon parameter optimization. The as-built (AB) microstructure revealed columnar grains with a preferred orientation along 100 direction. [gamma]' precipitation was suppressed due to high cooling rates in LPBF. Afterwards, the samples were subjected to the standard heat treatment (HT). Even though the grain morphology was similar to the AB sample, formation of carbide particles was observed along with the precipitation of [gamma]' after the HT. Mechanical properties of the samples both in AB and HT state was characterized. Results proved that when standard HT is applied to the LPBF fabricated R41 parts, the measured room temperature (RT) strength and elongation meet the AMS specifications. Effect of build direction on the mechanical properties was also studied. Since the microstructure obtained after LPBF is very different compared to the conventional processing techniques, suitability of the commercially applied HT cycles has to be studied. Hence, additional HTs were applied to understand the effect of different solutionizing temperatures on the development of microstructure and mechanical properties. Detailed microstructural analysis were conducted after each HT. These analyses revealed that for HT above the [gamma]' solvus temperature, resulted in the precipitation of [gamma]' and carbide phases similarly to the sub-solvus HT but with a different size distribution and morphology. However, formation of an equiaxed grain morphology with random orientation was detected. Furthermore, tensile properties were tested at 760°C. YS and UTS values obtained for AB, sub-solvus and super-solvus HT samples were on par with the wrought and HT alloys reported in literature. However, the measured elongation and deformation behaviors showed significant differences. The columnar grain morphology of the sub-solvus HT sample led to the highest elongation while the microstructure obtained after super-solvus treatment had the highest work hardening rate during deformation. Finally, the knowledge gained from R41 was used to study the manufacturability of the R77 alloy. This alloy is more prone to cracking during fabrication due to its higher content of alloying elements. Elimination of cracking in a difficult to weld alloy solely by parameter optimization was proven possible with LPBF of R77. Furthermore, these crack-free structures were maintained upon a modified version of the standard HT. Detailed microstructural characterization of AB and HT samples were conducted similarly to the R41. In this case, presence of extremely fine [gamma]' precipitates were identified after LPBF, and a bimodal distribution of precipitates was developed following the HT. Tensile properties for both conditions were tested at RT and 810 °C and the results were compared with wrought counterparts and with other difficult to weld alloys fabricated by LPBF. The deformation behavior of the samples in both conditions changed with the temperature. AB sample showed significant hardening whereas, the HT one had improved elongation due to thermally activated microtwinning"--

Download or read book Direct Laser Metal Deposition of Nickel Based Superalloys written by Abhishek Ramakrishnan-Sudha and published by . This book was released on 2019 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this research is to facilitate the fundamental scientific understanding of melting and remelting of layers using a laser beam as the energy source, solidification and re-solidification theory, precipitation kinetics, structure-property-relationship of various nickel-based superalloys employing direct laser metal deposition (LMD)-based AM process. Thermodynamic simulation coupled with experimental proof, post-processing and advanced materials characterization methods are amalgamated to deepen the understanding of LMD processed nickel-based superalloys, thus, validating the feasibility of repair and fabrication of high-performance structural components with required microstructure and property.

Download or read book Development of Laser Welding and Surface Treatment of Metals written by Aleksander Lisiecki and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Constant striving to reduce pollutant emissions, greenhouse gases and energy consumption, i.e., sustainable development, forces the development of new and improved materials, technologies and manufacturing processes. One of the areas of sustainable development of the global economy is also the development of laser devices and the spreading of laser technology applications.The book deals with important issues related to the development of science and technology in the field of application the laser beam for joining, surface treatment, coatings. However, the thematic scope is not limited only to mentioned issues. The scope of the book covers issues related to advances in computational modelling of heat sources in laser and arc processes, unique techniques of underwater welding or unique techniques of forced cooling the weld metal under solidification during arc welding or hybrid process of laser deposition under cryogenic conditions, microstructural and mechanical characterisation of coatings and joints produced by different welding technologies. The above book contains valuable information, both theoretical and practical research results in the field of advanced technologies of joining, surface treatment and coatings, quality control and assessment, as well as management of the technological processes. Therefore, I deeply believe that the book will be a valuable and helpful for young scientists, engineers, and students in the field of welding and surface engineering, materials science, and manufacturing engineering.