共查询到20条相似文献,搜索用时 0 毫秒
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C. J. Bennett M. M. Attallah M. Preuss P. H. Shipway T. H. Hyde S. Bray 《Metallurgical and Materials Transactions A》2013,44(11):5054-5064
Finite element (FE) process modeling of inertia friction welding between dissimilar high-strength steels, AerMet® 100 and SCMV, has been carried out using the DEFORM?-2D (v10.0) software. This model was validated against experimental data collected for a test weld performed between the materials; this included process data such as upset and rotational velocities as well as thermal data collected during the process using embedded thermocouples. The as-welded hoop residual stress from the FE model was also compared with experimental measurements taken on the welded component using synchrotron X-ray and neutron diffraction techniques. The modeling work considered the solid-state phase transformations which occur in the steels, and the trends in the residual stress data were well replicated by the model. 相似文献
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Metallurgist - Based on the analysis of the Russian-made 4 to 16 mm thick rolled products produced by thermomechanical rolling from high-strength (yield point: 433 to 828 MPa) low-alloyed welding... 相似文献
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Development of New High-Strength Carbide-Free Bainitic Steels 总被引:1,自引:0,他引:1
An attempt was made to optimize the mechanical properties by tailoring the process parameters for two newly developed high-strength
carbide-free bainitic steels with the nominal compositions of 0.47 pct C, 1.22 pct Si, 1.07 pct Mn, 0.7 pct Cr (S1), and 0.30 pct
C, 1.76 pct Si, 1.57 pct Mn, and 0.144 pct Cr (S2) (wt pct), respectively. Heat treatment was carried out via two different routes: (1) isothermal transformation and (2) quenching followed by isothermal tempering. The results for the
two different processes were compared. The bainitic steels developed by isothermal heat treatment were found to show better
mechanical properties than those of the quenched and subsequently tempered ones. The effect of the fraction of the phases,
influence of the transformation temperatures, the holding time, and the stability of retained austenite on the mechanical
properties of these two steels was critically analyzed with the help of X-ray diffraction, optical metallography, scanning
electron microscopy, and atomic force microscopy. Finally, a remarkable combination of yield strength of the level of 1557 MPa
with a total elongation of 15.5 pct was obtained. 相似文献
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Gianfranco Lovicu Mauro Bottazzi Fabio D’Aiuto Massimo De Sanctis Antonella Dimatteo Ciro Santus Renzo Valentini 《Metallurgical and Materials Transactions A》2012,43(11):4075-4087
Advanced high-strength steels (AHSS) have a better combination between strength and ductility than conventional HSS, and higher crash resistances are obtained in concomitance with weight reduction of car structural components. These steels have been developed in the last few decades, and their use is rapidly increasing. Notwithstanding, some of their important features have to be still understood and studied in order to completely characterize their service behavior. In particular, the high mechanical resistance of AHSS makes hydrogen-related problems a great concern for this steel grade. This article investigates the hydrogen embrittlement (HE) of four AHSS steels. The behavior of one transformation induced plasticity (TRIP), two martensitic with different strength levels, and one hot-stamping steels has been studied using slow strain rate tensile (SSRT) tests on electrochemically hydrogenated notched samples. The embrittlement susceptibility of these AHSS steels has been correlated mainly to their strength level and to their microstructural features. Finally, the hydrogen critical concentrations for HE, established by SSRT tests, have been compared to hydrogen contents absorbed during the painting process of a body in white (BIW) structure, experimentally determined during a real cycle in an industrial plant. 相似文献
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O. A. Bannykh A. M. Sorokin I. O. Bannykh E. I. Lukin 《Russian Metallurgy (Metally)》2018,2018(6):528-532
The structure and the mechanical properties of the high-strength structural martensitic steels used in manufacturing the mechanism parts subjected to significant cyclic dynamical loads are considered. All the steels have a similar martensitic–bainite structure and a high stability of their mechanical properties. At the same time, their structures are found to contain secondary phases, which can degrade their functional properties. 03Kh11N10M2T maraging steel exhibits fairly high impact toughness for this class of steels despite a brittle character of fracture during bending impact tests. 相似文献
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《钢铁研究学报(英文版)》2011,(Z1):72-79
After research and development for decades,low-alloy high-strength steels have been widely used and playing an important role in economy.This article introduces,from the perspective of environmental protection,the Baosteel’s latest progress of low-alloy high-strength steels continuously innovated with the focus of achieving high-strength,high-toughness,long service life and versatile functions,and with the aim of providing energy-saving and pollution-reduction solutions to down-stream sectors. 相似文献
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The article describes principles of developing steels for maritime structures and main pipelines.The scientific approach lies in forming an ultra fine-grained and submicrocrystal structure through thermomechanical treatment of low-carbon low-alloyed steels,providing higher strength and resistance to brittle fracture.The article presents results of assessing the operability characteristics and introducing new steels. 相似文献
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Dieter Isheim Allen H. Hunter Xian J. Zhang David N. Seidman 《Metallurgical and Materials Transactions A》2013,44(7):3046-3059
Austenite reversion in martensitic steels is known to improve fracture toughness. This research focuses on characterizing mechanical properties and the microstructure of low-carbon, high-nickel steels containing 4.5 and 10 wt pct Ni after a QLT-type austenite reversion heat treatment: first, martensite is formed by quenching (Q) from a temperature in the single-phase austenite field, then austenite is precipitated by annealing in the upper part of the intercritical region in a lamellarization step (L), followed by a tempering (T) step at lower temperatures. For the 10 wt pct Ni steel, the tensile strength after the QLT heat treatment is 910 MPa (132 ksi) at 293 K (20 °C), and the Charpy V-notch impact toughness is 144 J (106 ft-lb) at 188.8 K (?84.4 °C, ?120 °F). For the 4.5 wt pct Ni steel, the tensile strength is 731 MPa (106 ksi) at 293 K (20 °C) and the impact toughness is 209 J (154 ft-lb) at 188.8 K (?84.4 °C, ?120 °F). Light optical microscopy, scanning electron and transmission electron microscopies, synchrotron X-ray diffraction, and local-electrode atom-probe tomography (APT) are utilized to determine the morphologies, volume fractions, and local chemical compositions of the precipitated phases with sub-nanometer spatial resolution. The austenite lamellae are up to 200 nm in thickness, and up to several micrometers in length. In addition to the expected partitioning of Ni to austenite, APT reveals a substantial segregation of Ni at the austenite/martensite interface with concentration maxima of 10 and 23 wt pct Ni for the austenite lamellae in the 4.5 and 10 wt pct Ni steels, respectively. Copper-rich and M2C-type metal carbide precipitates were detected both at the austenite/martensite interface and within the bulk of the austenite lamellae. Thermodynamic phase stability, equilibrium compositions, and volume fractions are discussed in the context of Thermo-Calc calculations. 相似文献
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Byoungchul Hwang Chang Gil Lee Sung-Joon Kim 《Metallurgical and Materials Transactions A》2011,42(3):717-728
High-strength low-alloy (HSLA) steels were fabricated by varying thermomechanical processing conditions such as rolling and
cooling conditions in the intercritical region, and the low-temperature toughening mechanism was investigated in terms of
microstructure and the associated grain boundary characteristics. The steels acceleratedly cooled to relatively higher temperature
had lower tensile strength than those acceleratedly cooled to room temperature due to the increased volume fraction of granular
bainite or polygonal ferrite (PF) irrespective of rolling in the intercritical region, while the yield strength was dependent
on intercritical rolling, and start and finish cooling temperatures, which affected the formation of PF and low-temperature
transformation phases. The steel rolled in the intercritical region and cooled to 673 K (400 °C) provided the best combination
of high yield strength and excellent low-temperature toughness because of the presence of fine PF and appropriate mixture
of various low-temperature transformation phases such as granular bainite, degenerate upper bainite (DUB), lower bainite (LB),
and lath martensite (LM). Despite the high yield strength, the improvement of low-temperature toughness could be explained
by the reduction of overall effective grain size based on the electron backscattered diffraction (EBSD) analysis data, leading
to the decrease in ductile-to-brittle transition temperature (DBTT). 相似文献
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Nabeel Muhammad Alba Michelia Karasev Andrey Jönsson Pär G. Dogan Neslihan 《Metallurgical and Materials Transactions B》2019,50(4):1674-1685
Metallurgical and Materials Transactions B - Samples taken from laboratory-produced 3rd generation advanced high-strength steels, solidified at a low cooling rate, have been investigated to study... 相似文献
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Understanding the Behavior of Advanced High-Strength Steels Using Atom Probe Tomography 总被引:1,自引:0,他引:1
Elena Pereloma Hossein Beladi Laichang Zhang Ilana Timokhina 《Metallurgical and Materials Transactions A》2012,43(11):3958-3971
The key evidence for understanding the mechanical behavior of advanced high strength steels was provided by atom probe tomography (APT). Chemical overstabilization of retained austenite (RA) leading to the limited transformation-induced plasticity (TRIP) effect was deemed to be the main factor responsible for the low ductility of nanostructured bainitic steel. Appearance of the yield point on the stress-strain curve of prestrained and bake-hardened transformation-induced plasticity steel is due to the unlocking from weak carbon atmospheres of newly formed during prestraining dislocations. 相似文献
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介绍了单面埋弧焊、气电立焊以及电渣焊3种在钢制结构制造行业应用最为广泛的大线能量焊接技术。针对大线能量焊接技术的大线能量、高自动化、强迫成型的特点,指出大线能量焊接用钢开发的关键技术是降碳、增锰、加钛、精确控制Ti/N比的成分设计及微合金化,优化冶炼工艺,加强热影响区中细小针状铁素体形成的组织控制和控冷中的板形控制,配套焊接工艺优化及焊材的研究等。 相似文献
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A detailed characterization of two dissimilar high-strength steels, SCMV and Aermet 100, joined by inertia friction welding
(IFW)—a solid-state welding technique—was undertaken using high energy synchrotron X-ray diffraction and advanced electron
microscopy in order to understand the dramatic hardness variation across such a weld. It was found that the severe high-temperature
deformation in the thermomechanically affected zones (TMAZs) of the weld, stabilized ordered, and nanosized FeCo zones in
Aermet 100 and about 12 to 14 vol pct austenite in SCMV (Ni equivalent 9 wt pct). The ordered FeCo zones in Aermet 100 resulted
in exceptionally high hardness values of 700 to 725 HV. Very close to the weld line, the TMAZ of Aermet 100 also displayed
a region with about 15 vol pct austenite, while in the parent material, 8 to 9 vol pct was typically observed. No indication
of martensite was found in the weld region of Aermet 100. Ferrite texture analysis at different locations within the TMAZs
on either side of the weld showed that SCMV develops a very strong α-fiber texture near the weld line and, in addition, a γ-fiber texture toward the heat-affected zone (HAZ), suggesting the presence of ferrite during welding near the weld line and
recrystallization further away. The ferrite texture development in the TMAZ of Aermet 100 was relatively weak, suggesting
that austenite is a dominant phase in the TMAZ during IFW. 相似文献