Download or read book The Work Hardening of Austenitic Stainless Steel Applied to the Fabrication of High strength Conductors microform written by Kevin Spencer and published by Library and Archives Canada = Bibliothèque et Archives Canada. This book was released on 2004 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt: The kinetics of the martensite transformation was studied, and the detailed structure of the transformation product. This information was used to model the kinetics of the transformation, and the resultant strengthening which occurs from the strain-induced martensite transformation.
Download or read book Electron Beam Melting of Metastable Austenitic Stainless Steel written by Johannes Günther and published by BoD – Books on Demand. This book was released on 2020-01-01 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary focus of this work is the processing – microstructure – property correlation of EBM manufactured high-alloyed austenitic CrMnNi stainless steel. Independent of the applied process parameters, to this point this alloy exhibits a fine-grained and weak textured microstructure in the as-built state upon EBM processing. As detailed in the literature review, this is opposite to numerous alloys like the benchmark AISI 316L stainless steel, which are commonly characterized by epitaxial growth of columnar grains elongated parallel to building direction. A theory for this unusual observation is presented based on a grain refinement due the process-inherent cyclic heat-treatment, i.e. repetitive reheating and partial melting of the consolidated material due to the energy input during melting of subsequent layers and resulting solid-liquid as well as solid-solid (ferritic bcc to austenitic fcc phase and vice versa) phase transformations. A calculation of the phase diagram, differential thermal II Abstract analysis and the investigation of the uppermost layers of bulky and thin-walled EBM processed structures are conducted to support this assumption. Moreover, the CrMnNi stainless steel specimens are characterized by an outstanding damage tolerance, which is demonstrated by tensile testing and examination of the fracture surfaces revealing large lack-of-fusion defects due to unsuitable process parameters. Combined EBSD and X-ray diffraction analysis attribute the high damage tolerance to a pronounced strain hardening and mitigation of the effect of defects due to the transformation-induced plasticity (TRIP) effect. The deformation-induced martensitic transformation and associated strain hardening has also been correlated to a considerable low-cycle fatigue performance even under the presence of large inhomogeneities. The chemical composition of the alloy upon EBM processing is strongly dependent on the process parameters, i.e. it is demonstrated that the evaporation rate of Mn varies with the scan strategy and volumetric energy density. This phenomenon is utilized for the fabrication of homogeneous specimens with different Mn concentrations and resulting mechanical properties.These findings are subsequently employed for a prove-of-concept of the possibility to produce functionally graded material by a spatial adjustment of the scan strategy throughout the layer-wise built-up of objects. This is a novel approach for the synthetization of functionally graded materials based on the processing of one homogenous precursor powder feedstock. In summary, the particular CrMnNi stainless steel is introduced as a novel alloy design for AM because it addresses current material-related issues inherent in layer-wise technologies and potentially further contributes to the exploitation of the full potential of AM.
Download or read book Properties of austenitic stainless steels and their weld metals influence of slight chemistry variations written by C. R. Brinkman and published by ASTM International. This book was released on 1979 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Work hardening of dual phase steel written by Rieger, Florian and published by KIT Scientific Publishing. This book was released on 2016-07-01 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dual-phase steels exhibit good mechanical properties due to a microstructure of strong martensitic inclusions embedded in a ductile ferritic matrix. This work presents a two-scale model for the underlying work-hardening effects; such as the distinctly different hardening rates observed for high-strength dual-phase steels. The model is based on geometrically necessary dislocations and comprises the average microstructural morphology as well as a direct interaction between the constituents.
Download or read book Deformation Processing of Precipitation hardening Stainless Steels written by D. E. Strohecker and published by . This book was released on 1967 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Work Hardening Strength Restorative Mechanisms and Ductility in the Hot Working of 300 Series Stainless Steels written by Norman Daniel Ryan and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect Of Work Hardening On Sensitization Of Austenitic Ss written by Partha Pratim Dey and published by LAP Lambert Academic Publishing. This book was released on 2013-01 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main objective of the work is to present the entire scope of sensitization of stainless steel pertaining to environmental effect. The work starts with a continuum description of stainless steel, extends this background to the types of attack in stainless steel and then considers the major practical analysis of the topic conforming to the laboratory testing. The entire procedure of the testing has been pursued based on Standard practices for detecting susceptibility to Intergranular attack in austenitic stainless steels - ASTM A262 - 02A. All of the experiments has been done in the laboratory & workshops of Metallurgical Enginering of Bengal Engineering & Science University, Shibpur. Nos of research topics related to the corrosion investigation of S.S, have been studied thoroughly and taken the guidance of the achievers triumph.
Download or read book On the Assessment of Tensile Work Hardening Behaviour of Type 316L N Austenitic Stainless Steel in the Framework of d Vs d Using Flow Stress Contribution from Dislocations written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advanced High Strength Steel And Press Hardening Proceedings Of The 4th International Conference On Advanced High Strength Steel And Press Hardening Ichsu2018 written by Yisheng Zhang and published by World Scientific. This book was released on 2018-12-18 with total page 631 pages. Available in PDF, EPUB and Kindle. Book excerpt: The automotive industry requirements for vehicle weight reduction, weight containment, improved part functionality and passenger safety have resulted in the increased use of steel grades with a fully martensitic microstructure. These steel grades are essential to improve the anti-intrusion resistance of automotive body parts and the related passenger safety during car collisions. Standard advanced high strength steel (AHSS) grades are notoriously difficult to be formed by cold stamping; they are characterized by elastic springback, poor stretch flangeability and low hole expansion ratios. Hot stamping has therefore received much attention recently as an alternative technology to produce AHSS automotive parts.In this book, selected articles from the Fourth International Conference on Advanced High Strength Steel and Press Hardening held on August 20-22th, 2018 in Hefei, China, are compiled. It focuses on AHSS for the development of press hardening of high performance sheet metal for lightweight vehicle, advanced digital manufacturing technology, as well as the physical metallurgy principles of the hot stamping process.Aiming at the process design and industrial application for hot stamping of press hardened steel and high strength aluminium alloy sheet, the effect of temperature and strain rate on the formability and mechanical properties of the products is discussed. In addition, more practical cases are provided concerning accurate modelling and multi-physics coupling simulation of the hot stamping process. Furthermore, the influence of tool design on forming process, more precise process control strategies to increase production efficiency, and the improvement of hot stamping equipment by advanced design methods will also be presented.
Download or read book Advanced High Strength Steel and Press Hardening written by Yisheng Zhang and published by World Scientific Publishing Company. This book was released on 2018 with total page 614 pages. Available in PDF, EPUB and Kindle. Book excerpt: The automotive industry requirements for vehicle weight reduction, weight containment, improved part functionality and passenger safety have resulted in the increased use of steel grades with a fully martensitic microstructure. These steel grades are essential to improve the anti-intrusion resistance of automotive body parts and the related passenger safety during car collisions. Standard advanced high strength steel (AHSS) grades are notoriously difficult to be formed by cold stamping; they are characterized by elastic springback, poor stretch flangeability and low hole expansion ratios. Hot stamping has therefore received much attention recently as an alternative technology to produce AHSS automotive parts. In this book, selected articles from the Fourth International Conference on Advanced High Strength Steel and Press Hardening held on August 20-22th, 2018 in Hefei, China, are compiled. It focuses on AHSS for the development of press hardening of high performance sheet metal for lightweight vehicle, advanced digital manufacturing technology, as well as the physical metallurgy principles of the hot stamping process. Aiming at the process design and industrial application for hot stamping of press hardened steel and high strength aluminium alloy sheet, the effect of temperature and strain rate on the formability and mechanical properties of the products is discussed. In addition, more practical cases are provided concerning accurate modelling and multi-physics coupling simulation of the hot stamping process. Furthermore, the influence of tool design on forming process, more precise process control strategies to increase production efficiency, and the improvement of hot stamping equipment by advanced design methods will also be presented.
Download or read book Reducing Tool Wear When Machining Austenitic Stainless Steels written by T. Kosa and published by . This book was released on 1998 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Austenitic stainless steels are considered more difficult to machine than carbon steels due to their high work hardening rate, large spread between yield and ultimate tensile strength, high toughness and ductility, and low thermal conductivity. These characteristics can result in a built-up edge or excessive tool wear during machining, especially when the cutting speed is too high. The practical solution is to lower the cutting speed until tool life reaches an acceptable level. However, lower machining speed negatively impacts productivity. Thus, in order to overcome tool wear at relatively high machining speeds for these alloys, on-going research is being performed to improve cutting fluids, develop more wear-resistant tools, and to modify stainless steels to make them less likely to cause tool wear.
Download or read book Effect of Work Hardening on Rolling Contact Fatigue Strength of High manganese Austenitic Steel written by T. Fukui and published by . This book was released on 1989 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Strain Hardening of Austenitic Stainless Steel written by Gordon W. Powell and published by . This book was released on 1955 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Mechanisms of Deformation and Work Hardening in Aisi Type 301 Stainless Steel written by W. F. Barclay and published by . This book was released on 1965 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The mechanical properties of austenitic and martensitic stainless steels have been the subject of numerous research papers. The most complex types of materials, however, are the semiaustenitic steels which transform from austenite to martensite during plastic deformation. The most common commercial material which makes use of this characteristic is AISI Type 301. The research reported here had as its goal the determination of the mechanisms which control strain hardening and plastic deformation in commercially produced Type 301. The primary research tools used to reveal the mechanisms of deformation were the measurement of martensite forming during plastic deformation and the examination, by electron transmission and electron diffraction, of tension specimens deformed to various increments of plastic strain.
Download or read book Directed Energy Deposited Austenitic Stainless Steels written by Thale Ranger Smith and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The promise of greater design flexibility, resource savings, and lead time reductions has generated great interest in additive manufacturing (AM) technologies, such as laser directed energy deposition (DED), for small-lot production of relatively complex engineering components. Although austenitic stainless steels are among the most commonly fabricated materials by DED, the relationships between the thermomechanical history experienced by the materials, distinct microstructures and processing defects, and spatially heterogeneous tensile and fatigue properties developed in DED austenitic stainless steels are still not well understood. Therefore, the goal of this work was to systematically characterize spatially distributed microstructural features and processing defects in DED austenitic stainless steels to elucidate their effects on the tensile and fatigue loading response of these materials. First, a metallurgical basis for the development and evolution of microstructural features was established by considering the welding metallurgy of austenitic stainless steels as an analog for the DED process. Small differences in alloy composition are shown to influence solidification behavior and produce distinct microstructures that exhibit, for example, different grain sizes of ~30 [mu]m (primary austenite solidified) and ~10 [mu]m (primary ferrite solidified). However, having experienced similar thermomechanical history, the materials had tensile yield strengths of ~550 MPa. Annealing was then used to evolve the microstructure and properties of the DED materials. Although the tensile properties of DED and conventional forged materials may be nearly identical, DED microstructural features influenced annealing behavior, effectively increasing the temperature required to cause recrystallization and grain growth for the same annealing time. While the hardness of forged material was entirely correlated with geometrically necessary dislocation density, the homogenization of compositional microsegregation in the DED materials appeared to additionally contribute to decreased hardness. Differences in tensile yield strength across DED austenitic stainless steel structures was further attributed to the evolution of thermomechanical constraints experienced by as-deposited materials away from the deposition baseplate. Corresponding differences in microstructural features were quantitatively characterized and used in an analysis of microstructural strengthening mechanisms. Dislocation strengthening and compositional microsegregation strengthening were found to have the greatest contributions to yield strength differences with distance from the baseplate and accounted for nearly the entire difference in estimated yield strength between an as-deposited and fully annealed DED material. Processing defects that may be produced in DED AM were found to accelerate fatigue crack initiation, thereby shortening notched fatigue life. However, the fatigue crack growth behavior of DED austenitic stainless steels did not exhibit a strong dependence on processing defects or microstructure. A conservative tolerance boundary for notched fatigue life suggested a fatigue limit of ~0.15 the tensile strength, accounting for the stress concentration of processing defects, for both wrought and DED austenitic stainless steels.
Download or read book The Effect of Work Hardening on the Fatigue Properties of Ferritic Stainless Steel at Elevated Temperature written by William A Skinner and published by Hassell Street Press. This book was released on 2021-09-09 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work has been selected by scholars as being culturally important and is part of the knowledge base of civilization as we know it. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. To ensure a quality reading experience, this work has been proofread and republished using a format that seamlessly blends the original graphical elements with text in an easy-to-read typeface. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
Download or read book Work hardening of Dual phase Steel written by Florian Rieger and published by . This book was released on 2020-10-09 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dual-phase steels exhibit good mechanical properties due to a microstructure of strong martensitic inclusions embedded in a ductile ferritic matrix. This work presents a two-scale model for the underlying work-hardening effects; such as the distinctly different hardening rates observed for high-strength dual-phase steels. The model is based on geometrically necessary dislocations and comprises the average microstructural morphology as well as a direct interaction between the constituents. This work was published by Saint Philip Street Press pursuant to a Creative Commons license permitting commercial use. All rights not granted by the work's license are retained by the author or authors.
