File Name: duplex stainless steels microstructure properties and applications .zip
The purpose of this paper is to present an introduction to Duplex stainless steels by reviewing their main properties in terms of chemical composition, microstructure, mechanical characteristics and corrosion resistance. Toughness results obtained on base materials and welded specimens at various temperatures will be provided.
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When duplex stainless steel is melted it solidifies from the liquid phase to a completely ferritic structure. The duplex structure gives this family of stainless steels a combination of attractive properties:. Strength: Duplex stainless steels are about twice as strong as regular austenitic or ferritic stainless steels. Toughness and ductility: Duplex stainless steels have significantly better toughness and ductility than ferritic grades; however, they do not reach the excellent values of austenitic grades. Corrosion resistance: As with all stainless steels, corrosion resistance depends mostly on the composition of the stainless steel.
This paper aims to establish the microstructures and the process-structure relationships in duplex stainless steel powders consolidated by selective laser melting SLM. A priori data on energy density levels most appropriate to consolidation of duplex stainless steel powders through SLM served as the basis to converge on the laser settings. Experimental designs with varying laser power and scan speeds and test pieces generated allowed metallographic evaluations based on optical and scanning electron microscopy and electro backscatter diffraction analyses. Duplex stainless steel powders are established for processing by SLM. However, the dynamic point heat source and associated transient thermal fields affect the microstructures to be predominantly ferritic, with grains elongated in the build direction. Considerable CrN precipitation is also evidenced. Duplex stainless steels are relatively new candidates to be brought into the additive manufacturing realm.
Microstructure characterization of a duplex stainless steel weld by electron backscattering diffraction and orientation imaging microscopy techniques. Paulo J. Modenesi 1. This paper describes the electron backscatter diffraction EBSD technique used to characterize the microstructure especially the morphology and constitution of the base metal BM , the heat-affected zone HAZ and the fusion zone FZ on a lean duplex stainless steel LDX. This technique provides advantages due to its simplicity of use and greater depth of information, thereby increasing the amount of information obtained by traditional characterization techniques such as optical microscopy OM , scanning electron microscopy SEM , and transmission electron microscopy TEM. The use of EBSD together with orientation imaging microscopy OIM as a tool to understand phase transformation paths and ferrite-austenite variant selection was discussed.
Stainless steel is not a single material but the name for a family of corrosion resistant steels. Like many scientific discoveries the origins of stainless steel lies in a serendipitous accident. In Sheffield, England, Harry Brearley was investigating the development of new steel alloys for use in gun barrels. The first application of these steels was in cutlery for which Sheffield subsequently became world famous. Simultaneous work in France led to the development of the first austenitic stainless steels. Annual consumption is now well over 20 million tonnes and is rising in areas such as the construction industry and household appliances.
Duplex stainless steels      are a family of stainless steels. These are called duplex or austenitic-ferritic grades because their metallurgical structure consists of two phases, austenite face-centered cubic lattice and ferrite body centered cubic lattice in roughly equal proportions. They are designed to provide better corrosion resistance, particularly chloride stress corrosion and chloride pitting corrosion, and higher strength than standard austenitic stainless steels such as Type or Both the low nickel content and the high strength enabling thinner sections to be used give significant cost benefits. They are therefore used extensively in the offshore oil and gas industry for pipework systems, manifolds, risers, etc and in the petrochemical industry in the form of pipelines and pressure vessels. In addition to the improved corrosion resistance compared with the series stainless steels duplex steels also have higher strength.
Pranut Potiyaraj, PhD. This journal is published under the terms of the Creative Commons Attribution 4. The duplex steel grades exhibit high strength property and excellent corrosion resistance. However, after welding and heat treatment their toughness and corrosion resistance could be significantly decreased due to the occurrences of various detrimental intermetallic phases like sigma phase.
Developments, grades and specifications; Alloy design; Microstructure; Forming and machining; Physical and mechanical properties; Corrosion; Stress corrosion cracking; Welding metallurgy; Welding processes; Weld properties; Non-destructive testing of welds; Applications; Service experience. Two very successful conferences - in Glasgow and Beaune - were held on duplex stainless steels during the first half of the '90s. This book takes keynote papers from each, and develops and expands them to bring the topics right up to date.
Все, что полицейский мог сделать, - это проводить его до маленькой муниципальной клиники неподалеку от парка. Там он его и оставил.
Он приближался к двери. - Черт его дери! - почти беззвучно выругалась Сьюзан, оценивая расстояние до своего места и понимая, что не успеет до него добежать. Хейл был уже слишком близко. Она метнулась к буфету в тот момент, когда дверь со звуковым сигналом открылась, и, остановившись у холодильника, рванула на себя дверцу. Стеклянный графин на верхней полке угрожающе подпрыгнул и звонко опустился на место. - Проголодалась? - спросил Хейл, подходя к .
Microstructure and Property Evolution by Surface Duplex stainless steels with a PREN higher than 40 are extremely resistant With respect to applications, one of the main restrictions of duplex stainless steels has been the.OrГgenes S. 17.12.2020 at 07:22
Duplex Stainless Steels Microstructure Properties and Applications In summary, nickel does have some direct effect on corrosion properties, for instance.Bayard H. 17.12.2020 at 08:41
Duplex Stainless Steels - 1st Edition - ISBN: , DRM-free (Mobi, PDF, EPub) Microstructure; Forming and machining; Physical and mechanical properties; Corrosion; Stress corrosion cracking; Welding metallurgy; Welding processes; Weld properties; Non-destructive testing of welds; Applications; Service.