The present study aims to clarify the possibility of rapid heating in preparation low-carbon ultrafine (UFG) steel. effects rate on phase transformation, microstructure and precipitation a microalloyed steel were elaborately investigated. results manifest that potentially provides simple innovative process for UFG steels just by increasing rate. parent austenite grains refined due more reserved (Nb, Ti, V)C precipitates dislocations within short heating. However, an effective holding time...

The rapid heating treatment with different tempering temperatures of 160, 200 and 320 °C was innovatively applied in one developed martensitic wear-resistant steel. elaborate characterization on the evolution microstructure-mechanical properties including wear performance were compared. Results manifested that yielded a peak steel when tempered at °C, by which tensile strength elongation 1762.46 MPa 13.13%, respectively, accompanied highest product 23.14 GPa·%. enhanced work hardening...

In this work, three low-carbon bainitic steels, with different Mo contents, were designed to investigate the effects of addition on microstructure and mechanical properties. Two-step cooling, i.e., initial accelerated cooling subsequent slow was used obtain desired bainite microstructure. The results show that product strength elongation first increases then shows no significant change increasing Mo. Compared Mo-free steel, in Mo-containing steel tends have a lath-like morphology due...

Two low carbon carbide-free bainitic steels (with and without Cr addition) were designed, each steel was treated by two kinds of heat treatment procedure (austempering continuous cooling). The effects addition on transformation, microstructure, properties investigated dilatometry, metallography, X-ray diffraction, a tensile test. results show that hinders the isothermal this effect is more significant at higher transformation temperatures. In addition, increases strength elongation...

Rapid heating is a promising technique for achieving excellent mechanical properties. This study innovatively applies rapid to novel Ti–Mo martensite steel through in-situ observation experiments. By comparing the microstructure evolutions at rates of 1 and 30 °C/s, relationship between property evolution was elucidated. The results indicate that refined austenite grains resulting from stem enhanced grain nucleation, accumulated dislocations, increased formation new carbides under large...

Based on reanalysis data from 1968 to 2021, this study investigates the characteristics of Silk Road Pattern (SRP), a teleconnection pattern embedded in Asian jet during summer, intraseasonal timescale. Results showed that 10–30-day oscillations are main component SRP variability. The results correlation for base points along axis indicate timescale, hereafter referred as Bi-weekly Oscillation (BSRP), is characterized by 3 alternatively-signed cells 200-hPa meridional wind...

Metal-based composite coatings have been widely studied for their excellent properties. In order to improve the properties of nickel tungsten boron (Ni-W-B) matrix, Ni-W-B/PC were prepared by electrodeposition in presence polydopamine functionalized VC (P-VC) and cerium oxide (CeO2) nanoparticles. The effect content nanomaterials on Ni-W-B was investigated. results showed that dense, uniform, crack-free, best performance achieved at a 2 g/L. addition CeO2 nanoparticles can fill tiny defects...

In order to study the effect of Si content on morphology, amount, and distribution fayalite (Fe2SiO4), three low-carbon steels with different contents were selected, reheating tests conducted in an industrial furnace a hot strip plant. The results show that distributes two forms—first, Fe2SiO4, innermost layer oxide scale, and, second, granular SiO2, dispersively distributed matrix near scale. addition, Fe2SiO4 appears net-like form scale close iron when is 1.21 wt. %. However, no obvious...

An advanced bainite rail with high strength–toughness combination was produced in a steel mill and the effects of tempering on microstructure properties were investigated by optical microscopy, transmission electron back-scattering diffraction X-ray diffraction. Results indicate that tensile strength, elongation impact toughness about 1470 MPa, 14.5% 83 J/cm2, respectively, after at 400 °C for 200 min. Therefore, high-strength good developed. In addition, amount retained austenite (RA)...

The oxidation behavior of silicon-containing steel was studied by applying segmented heating routes similar to the atmosphere and process in an industrial reheating furnace. tests were carried out on a simultaneous thermal analyzer at temperatures 1150 °C–1300 °C. morphologies Fe2SiO4 observed SEM, penetration depths layer different determined using Image-Pro Plus 6.0 software. results show that ≥1235 °C, rate total mass gain have no relation with temperature; versus time follows linear law...

The bainite transformation behavior and properties of low carbon carbide‐free bainitic steels containing different silicon (Si) contents are investigated by two types heat treatment processes: isothermal process (ITP) continuous cooling (CCP). results indicate that for ITP CCP, the kinetics is retarded final amount decreases with increasing Si content. However, both strength total elongation improve increase content in range 1.0–2.0 wt%, resulting an apparent increment comprehensive property...

In the present study, thermo‐mechanical controlled processing (TMCP) technology was applied to produce Ti–Nb–Mo microalloyed hot‐rolled steels. The strength at tail of a strip coil is often found be non‐uniform. microstructural and mechanical properties specimens in outermost circle as well third fifth from were analyzed detail. optical microscopy (OM) electron backscatter diffraction (EBSD) techniques are employed for characterization ferrite grains grain boundaries. precipitates revealed...

A novel method of cryorolling martensite for fabricating ultrafine grained low-carbon steel with attractive strength was proposed. The results indicate that ultrafine-grain structured could be manufactured by and the subsequent annealing martensite. mean ferrite size 132.0 nm tensile 978.1 MPa were obtained in a specimen reduction 70% thickness. There peak value valley grain increase from 50% to 80%, respectively. further growth at 80% is attributed heavier distortion energy large reduction,...

Four different isothermal treatment processes were designed to investigate the effect of parameters on comprehensive property in an ultrafine bainite steel. processes, including two kinds one-step transformation procedures at temperature above MS and below MS, respectively, two-step employed this study. The results indicate that compared with steel was not improved by austempering MS. However, it process. In addition, condition total time multi-step process same, product tensile strength...

Ultrafine grained low‐carbon steels are fabricated by cryorolling and cold‐rolling martensite starting microstructure at liquid nitrogen temperature ambient temperature, respectively. The results indicate that process present more potential in refining ferrite grains steel (132 nm) than deformation (330 nm). tensile strength increase from 867.0 to 970.2 MPa for the specimen cryorolled compared rolled temperature. decreased elongation is attributed coarse Fe 3 C particles during annealing....