Metallurgical and Materials Transactions A

artykuł

Factors Affecting Impact Toughness in Stabilized Intermediate Purity 21Cr Ferritic Stainless Steels and Their Simulated Heat-Affected Zones

Severi Anttila, Tuomas Alatarvas, David A. Porter

Metallurgical and Materials Transactions A > 2017 > 48 > 12 > 5879-5889

The correlation between simulated weld heat-affected zone microstructures and toughness parameters has been investigated in four intermediate purity 21Cr ferritic stainless steels stabilized with titanium and niobium either separately or in combination. Extensive Charpy V impact toughness testing was carried out followed by metallography including particle analysis using electron microscopy. The results...

artykuł

In Situ Observation of Kinetic Processes of Lath Bainite Nucleation and Growth by Laser Scanning Confocal Microscope in Reheated Weld Metals

Gaojun Mao, Rui Cao, Xili Guo, Yong Jiang, więcej

Metallurgical and Materials Transactions A > 2017 > 48 > 12 > 5783-5798

The kinetic processes of nucleation and growth of bainite laths in reheated weld metals are observed and analyzed by a combination of a laser confocal scanning microscope and an electron backscattering diffraction with a field emission scanning electron microscope. The results indicate that the surface relief induced by phase transformation is able to reveal the real microstructural morphologies of...

artykuł

Grain Growth in Nanocrystalline Mg-Al Thin Films

Karen Kruska, Aashish Rohatgi, Rama S. Vemuri, Libor Kovarik, więcej

Metallurgical and Materials Transactions A > 2017 > 48 > 12 > 6118-6125

An improved understanding of grain growth kinetics in nanocrystalline materials, and in metals and alloys in general, is of continuing interest to the scientific community. In this study, Mg-Al thin films containing ~10 wt pct Al and with 14.5 nm average grain size were produced by magnetron sputtering and subjected to heat treatments. The grain growth evolution in the early stages of heat treatment...

artykuł

Microstructure Optimization of Dual-Phase Steels Using a Representative Volume Element and a Response Surface Method: Parametric Study

Tarek M. Belgasam, Hussein M. Zbib

Metallurgical and Materials Transactions A > 2017 > 48 > 12 > 6153-6177

Dual-phase (DP) steels have received widespread attention for their low density and high strength. This low density is of value to the automotive industry for the weight reduction it offers and the attendant fuel savings and emission reductions. Recent studies on developing DP steels showed that the combination of strength/ductility could be significantly improved when changing the volume fraction...

artykuł

Correlation Among the Variant Group, Effective Grain Size, and Elastic Strain Energy During the Phase Transformation in 9Ni Steels

Hidenori Terasaki, Koji Moriguchi, Yusaku Tomio, Hideki Yamagishi, więcej

Metallurgical and Materials Transactions A > 2017 > 48 > 12 > 5761-5765

The effect of carbon content on the density of variant-pair boundaries was investigated in 9Ni steel using an electron backscatter diffraction patterns method. The changes in the density of variant-pair boundaries were correlated with the nondestructive measured values of shear modulus of the austenite phase at the phase transformation point. Furthermore, the effective grain size was correlated with...

artykuł

Upward Continuous Casting in the Manufacture of Cu-Cr-Ag Alloys: Potential for Enhancing Strength Whilst Maintaining Ductility

Dawei Yuan, Bin Yang, Jinshui Chen, Huiming Chen, więcej

Metallurgical and Materials Transactions A > 2017 > 48 > 12 > 6083-6090

Upward continuous casting was used to manufacture Cu-Cr-Ag high-strength high-conductivity alloys, for comparison with conventional processing methods. The behavior of the alloy samples was measured, including tensile strength, microhardness, and electrical conductivity. The microstructure was characterized using optical microscopy and transmission electron microscopy after each processing step. It...

artykuł

The Effect of Aging on the Microstructure of Selective Laser Melted Cu-Ni-Si

Anthony P. Ventura, Christopher J. Marvel, Gregory Pawlikowski, Martin Bayes, więcej

Metallurgical and Materials Transactions A > 2017 > 48 > 12 > 6070-6082

Precipitation hardening copper alloy C70250 was selectively laser melted to successfully produce components around 98 pct dense with high mechanical strength and electrical conductivity. Aging heat treatments were carried out at 723 K (450 °C) directly on as-printed samples up to 128 hours. Mechanical testing found that peak yield strength of around 590 MPa could be attained with an electrical conductivity...

artykuł

Effects of Heating and Cooling Rates on Phase Transformations in 10 Wt Pct Ni Steel and Their Application to Gas Tungsten Arc Welding

Erin J. Barrick, Divya Jain, John N. DuPont, David N. Seidman

Metallurgical and Materials Transactions A > 2017 > 48 > 12 > 5890-5910

10 wt pct Ni steel is a high-strength steel that possesses good ballistic resistance from the deformation induced transformation of austenite to martensite, known as the transformation-induced-plasticity effect. The effects of rapid heating and cooling rates associated with welding thermal cycles on the phase transformations and microstructures, specifically in the heat-affected zone, were determined...

artykuł

Dilatometry Analysis of Dissolution of Cr-Rich Carbides in Martensitic Stainless Steels

Qiuliang Huang, Olena Volkova, Horst Biermann, Javad Mola

Metallurgical and Materials Transactions A > 2017 > 48 > 12 > 5771-5777

The dissolution of Cr-rich carbides formed in the martensitic constituent of a 13 pct Cr stainless steel was studied by dilatometry and correlative electron channeling contrast examinations. The dissolution of carbides subsequent to the martensite reversion to austenite was associated with a net volume expansion which in turn increased the dilatometry-based apparent coefficient of thermal expansion...

artykuł

Effect of Rolling and Subsequent Annealing on Microstructure, Microtexture, and Properties of an Experimental Duplex Stainless Steel

Arka Mandal, Sudipta Patra, Debalay Chakrabarti, Shiv Brat Singh

Metallurgical and Materials Transactions A > 2017 > 48 > 12 > 5960-5977

A lean duplex stainless steel (LDSS) has been prepared with low-N content and processed by different thermo-mechanical schedules, similar to the industrial processing that comprised hot-rolling, cold-rolling, and annealing treatments. The microstructure developed in the present study on low-N LDSS has been compared to that of high-N LDSS as reported in the literature. As N is an austenite stabilizer,...

artykuł

Structural and Magnetic Studies of Thermally Treated NiFe₂O₄ Nanoparticles

Surajit Ghosh, Prayas Chandra Patel, Debraj Gangopadhyay, Poornima Sharma, więcej

Metallurgical and Materials Transactions A > 2017 > 48 > 12 > 6135-6141

The heat treatment of nanoparticles can have a direct effect on their particle sizes, which, in turn, can influence many of their structural and magnetic properties. Here, we report the effect of sintering temperature on the chemically synthesized high-quality NiFe₂O₄ nanoparticles. The structural studies show the formation of pure NiFe₂O₄ nanoparticles with the space group $$ Fd{\bar{\text{3}}}m...

artykuł

Tracking the Evolution of Annealing Textures from Individual Deformed Grains in a Cross-Rolled Non-oriented Electrical Steel

Mehdi Sanjari, Mehdi Mehdi, Youliang He, Erik J. Hilinski, więcej

Metallurgical and Materials Transactions A > 2017 > 48 > 12 > 6013-6026

The evolution of microtexture and microstructure of a cross-rolled 0.88 wt pct Si non-oriented electrical steel was investigated using a quasi-in situ electron backscatter diffraction (EBSD) technique, where individual deformed grains with various initial orientations were tracked during annealing at the same temperature for different times. The textures recrystallized from different deformed grains...

artykuł

A Novel Thermodynamic Model for Obtaining Solid–Liquid Interfacial Energies

Cong Zhang, Yong Du

Metallurgical and Materials Transactions A > 2017 > 48 > 12 > 5766-5770

The modeling of solid–liquid interfacial energies is developed in the present work. The total interfacial energy is separated into chemical and structure contributions, which are estimated by applying reported Gibbs energies, as well as correlated with molar interfacial area and melting temperature of solid phase. The present model is well validated with comprehensive datasets of measured solid–liquid...

artykuł

Effect of Cooling Rate on Precipitation Behavior and Micromechanical Properties of Ferrite in V-N Alloyed Steel During a Simulated Thermomechanical Process

Jing Zhang, Fu-Ming Wang, Zhan-Bing Yang, Chang-Rong Li

Metallurgical and Materials Transactions A > 2017 > 48 > 12 > 6142-6152

The effect of the cooling rate after finish deformation at 1223 K (950 °C) on the microstructural evolution, V(C,N) precipitation, and micromechanical properties of ferrite in high-N V-alloyed building steel was comparatively investigated using a Gleeble-1500 thermomechanical simulator. Metallographic analysis shows that polygonal ferrite (PF) and pearlite (P) were dominant microconstituents at cooling...

artykuł

Magnetostriction Increase of Polycrystalline Fe-Al-B Thin Sheets after Thermomechanical Process

M. B. S. Dias, G. O. Fulop, C. A. Baldan, C. Bormio-Nunes

Metallurgical and Materials Transactions A > 2017 > 48 > 12 > 5951-5959

Magnetostrictive materials are applied in several types of sensors, actuators, and energy harvesting. In particular, for AC devices, thin materials are desired to reduce eddy current losses. It is well known that the magnetostriction of single crystals and textured materials is higher than in polycrystalline ones, however, the cost and manufacture speed are crucial to be used as parts of commercial...

artykuł

In-Plane Anisotropy in Mechanical Behavior and Microstructural Evolution of Commercially Pure Titanium in Tensile and Cyclic Loading

Subhasis Sinha, N. P. Gurao

Metallurgical and Materials Transactions A > 2017 > 48 > 12 > 5813-5832

Tensile and cyclic deformation behavior of three samples oriented at 0, 45, and 90 deg to the rolling direction in the rolling direction–transverse direction (RD–TD) plane of cold-rolled and annealed plate of commercially pure titanium is studied in the present investigation. The sample along the RD (R0) shows the highest strength but lowest ductility in monotonic tension. Although ultimate tensile...

artykuł

Internal Friction of Austenitic Fe-Mn-C-Al Alloys

Young-Kook Lee, Sohee Jeong, Jee-Hyun Kang, Sang-Min Lee

Metallurgical and Materials Transactions A > 2017 > 48 > 12 > 6102-6110

The internal friction (IF) spectra of Fe-Mn-C-Al alloys with a face-centered-cubic (fcc) austenitic phase were measured at a wide range of temperature and frequency (f) to understand the mechanisms of anelastic relaxations occurring particularly in Fe-Mn-C twinning-induced plasticity steels. Four IF peaks were observed at ~346 K (73 °C) (P₁), 389 K (116 °C) (P₂), 511 K (238 °C) (P₃), and 634 K (361 °C)...

artykuł

In Situ Neutron Diffraction Study of the Influence of Microstructure on the Mechanical Response of Additively Manufactured 304L Stainless Steel

D. W. Brown, D. P. Adams, L. Balogh, J. S. Carpenter, więcej

Metallurgical and Materials Transactions A > 2017 > 48 > 12 > 6055-6069

In situ neutron diffraction measurements were completed during tensile and compressive deformation of stainless steel 304L additively manufactured (AM) using a high power directed energy deposition process. Traditionally produced wrought 304L material was also studied for comparison. The AM material exhibited roughly 200 MPa higher flow stress relative to the wrought material. Crystallite size, crystallographic...

artykuł

Effect of Chemical Composition on Susceptibility to Weld Solidification Cracking in Austenitic Weld Metal

Kota Kadoi, Kenji Shinozaki

Metallurgical and Materials Transactions A > 2017 > 48 > 12 > 5860-5869

The influence of the chemical composition, especially the niobium content, chromium equivalent Cr_eq, and nickel equivalent Ni_eq, on the weld solidification cracking susceptibility in the austenite single-phase region in the Schaeffler diagram was investigated. Specimens were fabricated using the hot-wire laser welding process with widely different compositions of Cr_eq, Ni_eq, and niobium in the region...

artykuł

Development of High-Strength High-Temperature Cast Al-Ni-Cr Alloys Through Evolution of a Novel Composite Eutectic Structure

P. Pandey, S. Kashyap, C. S. Tiwary, K. Chattopadhyay

Metallurgical and Materials Transactions A > 2017 > 48 > 12 > 5940-5950

Aiming to develop high-strength Al-based alloys with high material index (strength/density) for structural application, this article reports a new class of multiphase Al alloys in the Al-Ni-Cr system that possess impressive room temperature and elevated temperature (≥ 200 °C) mechanical properties. The ternary eutectic and near eutectic alloys display a complex microstructure containing intermetallic...

INFONA - portal komunikacji naukowej

Metallurgical and Materials Transactions A

Factors Affecting Impact Toughness in Stabilized Intermediate Purity 21Cr Ferritic Stainless Steels and Their Simulated Heat-Affected Zones

In Situ Observation of Kinetic Processes of Lath Bainite Nucleation and Growth by Laser Scanning Confocal Microscope in Reheated Weld Metals

Grain Growth in Nanocrystalline Mg-Al Thin Films

Microstructure Optimization of Dual-Phase Steels Using a Representative Volume Element and a Response Surface Method: Parametric Study

Correlation Among the Variant Group, Effective Grain Size, and Elastic Strain Energy During the Phase Transformation in 9Ni Steels

Upward Continuous Casting in the Manufacture of Cu-Cr-Ag Alloys: Potential for Enhancing Strength Whilst Maintaining Ductility

The Effect of Aging on the Microstructure of Selective Laser Melted Cu-Ni-Si

Effects of Heating and Cooling Rates on Phase Transformations in 10 Wt Pct Ni Steel and Their Application to Gas Tungsten Arc Welding

Dilatometry Analysis of Dissolution of Cr-Rich Carbides in Martensitic Stainless Steels

Effect of Rolling and Subsequent Annealing on Microstructure, Microtexture, and Properties of an Experimental Duplex Stainless Steel

Structural and Magnetic Studies of Thermally Treated NiFe₂O₄ Nanoparticles

Tracking the Evolution of Annealing Textures from Individual Deformed Grains in a Cross-Rolled Non-oriented Electrical Steel

A Novel Thermodynamic Model for Obtaining Solid–Liquid Interfacial Energies

Effect of Cooling Rate on Precipitation Behavior and Micromechanical Properties of Ferrite in V-N Alloyed Steel During a Simulated Thermomechanical Process

Magnetostriction Increase of Polycrystalline Fe-Al-B Thin Sheets after Thermomechanical Process

In-Plane Anisotropy in Mechanical Behavior and Microstructural Evolution of Commercially Pure Titanium in Tensile and Cyclic Loading

Internal Friction of Austenitic Fe-Mn-C-Al Alloys

In Situ Neutron Diffraction Study of the Influence of Microstructure on the Mechanical Response of Additively Manufactured 304L Stainless Steel

Effect of Chemical Composition on Susceptibility to Weld Solidification Cracking in Austenitic Weld Metal

Development of High-Strength High-Temperature Cast Al-Ni-Cr Alloys Through Evolution of a Novel Composite Eutectic Structure

Opcje filtrowania

Data publikacji

INFONA - portal komunikacji naukowej

Metallurgical and Materials Transactions A

Dodaj adresata

Anulowanie wysłania wiadomości

Czy na pewno chcesz anulować wysłanie wiadomości?

Wyślij wiadomość

Opcje filtrowania

Data publikacji

Ustawianie zakresu dat

Podaj zakres dat dla filtrowania wyświetlonych wyników. Możesz podać datę początkową, końcową lub obie daty. Daty możesz wpisać ręcznie lub wybrać za pomocą kalendarza.

Zgłaszanie błędu / nadużycia

Nieudane wysłanie zgłoszenia

Ułatwienia dostępu