Author: G. M. GoodwinPublisher:
ISBN:
Category :
Languages : en
Pages : 24
Book Description
Fracture Toughness of Austenitic Stainless Steel Weld Metal at 4 K
Author: G. M. GoodwinFracture Toughness of Austenitic Stainless Steel Weld Metal at 4 K.
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Selection of the welding processess and weld filler metals for fabrication of a large toroidal superconducting magnet is described. Data available in the literature are collected and compared with data generated in this study for three welding processes, shielded metal arc (SMA), gas tungsten arc (GTA), and flux cored arc (FCA) welds had the highest fracture toughness as measured by K/sub Ic/ estimated from J/sub Ic/. The SMA and FCA welds had about the same toughness, below the GTA values but above the average from the literature. The fracture mode for all three processes was typified by ductile dimples. The fracture morphology of the FCA weld specimens was influenced by the solidification substructure, and small particles were found to be nucleation sites for void formation, especially for the GTA welds. All three welding processes were deemed adequate for the intended service and were used to fabricate the large magnet. A trunnion-type turning fixture eliminated the need for welding in the vertical and overhead positions. The GTA process was used for all root passes, and the horizontal welds were filled by the SMA process. Over 80% of the welds were done in the flat position with the FCA process, and its high deposition rate and ease of operation are credited with contributing greatly to the success of the effort.
Stainless Steels
Author: Joseph R. DavisPublisher: ASM International
ISBN: 9780871705037
Category : Technology & Engineering
Languages : en
Pages : 594
Book Description
ASM Specialty Handbook® Stainless Steels The best single-volume reference on the metallurgy, selection, processing, performance, and evaluation of stainless steels, incorporating essential information culled from across the ASM Handbook series. Includes additional data and reference information carefully selected and adapted from other authoritative ASM sources.
Austenitic Steels at Low Temperatures
Author: T. HoriuchiPublisher: Springer Science & Business Media
ISBN: 1461337305
Category : Technology & Engineering
Languages : en
Pages : 384
Book Description
The need for alternate energy sources has led to the develop ment of prototype fusion and MHD reactors. Both possible energy systems in current designs usually require the use of magnetic fields for plasma confinement and concentration. For the creation and maintenance of large 5 to 15 tesla magnetic fields, supercon ducting magnets appear more economical. But the high magnetic fields create large forces, and the complexities of the conceptual reactors create severe space restrictions. The combination of re quirements, plus the desire to keep construction costs at a mini mum, has created a need for stronger structural alloys for service at liquid helium temperature (4 K). The complexity of the required structures requires that these alloys be weldable. Furthermore, since the plasma is influenced by magnetic fields and since magnet ic forces from the use of ferromagnetic materials in many configur ations may be additive, the best structural alloy for most applica tions should be nonmagnetic. These requirements have led to consideration of higher strength austenitic steels. Strength increases at low temperatures are achieved by the addition of nitrogen. The stability of the austenitic structure is retained by adding manganese instead of nickel, which is more expensive. Research to develop these higher strength austenitic steels is in process, primarily in Japan and the United States.
Energy Research Abstracts
Author: Study on Ductile Fracture Strain and Fracture Toughness of Irradiated Austenitic Stainless Steels
Author: H. SakamotoPublisher:
ISBN:
Category : Dimple
Languages : en
Pages : 17
Book Description
Degradation of fracture strain and fracture toughness due to neutron irradiation in austenitic stainless steels are important issues to evaluate for plant life extension of light water reactors (LWRs). However, few efforts have been made to develop a prediction method for fracture strain and toughness. In this paper, ductile fracture of irradiated material was studied based on the irradiation-induced defects forming process combined with a ductile fracture process model i.e., void growth and coalescence model, and a model for fracture strain was developed as a function of fluence, applied stress and work hardening rate. Tensile tests of austenitic stainless steels irradiated up to about 1026 n/m2 in an LWR were conducted at room temperature and 561 K. Fracture strain decreased with the increase of neutron fluence, but no specimens showed any brittle features. The proposed model for fracture strain had good correlation with experimental results. The fracture surfaces were investigated by scanning electron microscope (SEM). Dimple diameter decreased with the increase of neutron fluence and this fact was presumed to support the propriety of the proposed fracture strain model. Fluence dependence of fracture toughness was studied based on the proposed fracture strain model. The proposed fracture toughness model agreed well with the open literature. Fracture toughness JIC of base metal and weld metal of Types 304 and 316 stainless steels neutron irradiated and tested at 673-700 K were predicted by the fracture toughness model. JIC of base metal was higher than the weld metal in the whole fluence range. JIC of base metal and weld metal decreased above the fluences of about 5x1025 n/m2 and 1x1025 n/m2 (E>0.1 MeV), respectively. Consequently, the proposed ductile fracture strain and fracture toughness models were applicable to predict those values for base metal and weld metal of neutron irradiated austenitic stainless steels.
Publications of the National Institute of Standards and Technology ... Catalog
Author: National Institute of Standards and Technology (U.S.)Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 424
Book Description
Publications of the National Bureau of Standards ... Catalog
Author: United States. National Bureau of StandardsPublisher:
ISBN:
Category :
Languages : en
Pages : 492
Book Description
Publications of the National Institute of Standards and Technology 1988 Catalog
Author: Rebecca J. PardeeAdvances in Cryogenic Engineering Materials
Author: K.D. TimmerhausPublisher: Springer Science & Business Media
ISBN: 1461398711
Category : Science
Languages : en
Pages : 1100
Book Description
The Sixth International Cryogenic Materials Conference (ICMC) was held on the campus of Massachusetts Institute of Technology in Cambridge in col laboration with the Cryogenic Engineering Conference (CEC) on August 12-16, 1985. The complementary program and the interdependence of these two dis ciplines foster the conference. Its manifest purpose is sharing the latest advances in low temperature materials science and technology. Equally im portant, areas of needed research are identified, prioriti-es for new research are set, and an increased appreciation of interdisciplinary, interlaboratory, and international cooperation ensues. The success of the conference is the result of the. able leadership and hard work of many people: S. Foner of M.I.T. coordinated ICMC efforts as its Conference Chairman. A. I. Braginski of Westinghouse R&D Center planned the program with the assistance of Cochairmen E. N. C. Dalder of Lawrence Livermore National Laboratory, T. P. Orlando of M.I.T., D. O. Welch of Brookhaven National Laboratory, and numerous other committee members. A. M. Dawson of M.I.T., Chairman of Local Arrangements, and G. M. Fitzgerald, Chairman of Special Events, skillfully managed the joint conference. The contributions of the CEC Board, and particularly its conference chairman, J. L. Smith, Jr. of M.I.T., to the organization of the joint conference are also gratefully acknm.ledged.