INVESTIGATION OF CHEMICAL COMPOSITION INFLUENCE ON MECHANICAL PROPERTIES OF API X65 MICROALLOYED STEEL
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Microalloyed steel
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The effects of tungsten (W) addition on the microstructure, impact toughness and tensile properties of a microalloyed cast steel were systematically investigated. The results indicate that W alloying in microalloyed cast steel plays a positive role in inhibiting dendrite during casting process, and the yield strength, ultimate tensile strength and fracture strain can be simultaneously improved after W addition. Both microalloyed cast steels with and without W additions show very low impact energies, indicating W addition has no significant effect on the impact toughness. The present work provides a possibility to develop new W-containing microalloyed steels with improved mechanical properties.
Microalloyed steel
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There currently is a strong interest in using ‘as-hot rolled’ steels instead of ‘heat treated’ steels within the field of microalloyed steels with superior strength and improved ductility. However, mechanical and microstructural characterization of these steels is less elaborated. The present work is an effort in that direction, focusing on the evaluation of the impact of a variable Nb and C content on the microstructure and mechanical properties for seven hot rolled microalloyed steels and deriving an empirical relation between the mechanical properties and the Nb/C ratio.
Ductility (Earth science)
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Hot rolled
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Carbon fibers
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Microalloyed steel
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Microalloyed steel
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Microalloyed steels are the product of extensive research of the eighties and are good examples of high strength steels produced by microstructural tailoring of materials through microalloying and thermomechanical processing. This paper is based on the work carried out at the author's laboratory on low carbon microalloyed steel containing minor additions of Nb and Ti and reports the parameters of melting, casting and thermomechanical proc-essing established . The microstructural developments and physical and mechanical properties achieved are discussed
Thermomechanical processing
Microalloyed steel
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Microalloyed steel
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Line (geometry)
Microalloyed steel
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Modeling strength of hot rolled strip based on industrial data may cause misleading predictions because of the high dimension, low quality and unbalanced original data. Industrial data processing is essential to building a successful composition-process-property corresponding relationship model. In current work, the Pauta criterion was implemented to eliminate abnormal data, and uniform grid technique was applied to select out the represented data for obtaining the balanced training data set. Prior to modeling by Bayesian regularization neural network, principal component analysis was applied to alleviate the effect of correlation variables on the modeling. The yield strength prediction model of Nb–Ti microalloyed steel was established with the relative error of ±8%, indicating a good agreement between predicted value and measured value. Finally, the relationship of chemical composition, process parameters and yield strength of hot rolled strip under specific process parameters was analyzed for a further investigation.
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A new type of Nb-V-Ti microalloyed cast steel was produced. Computer simulation was adopted to optimize the content of alloying elements. The microstructure of the microalloyed steel was analyzed. The fatigue property, wear and friction properties and rupture toughness of the steel were investigated. The service and operating properties of Nb-V-Ti microalloyed cast steel coupler were also examined. The results show that the steel has excellent comprehensive mechanical properties. The granular bainite structure and precipitation strengthening are the primary strengthening mechanism. The fine grain brings the steel good plasticity and excellent toughness. Various service and operating properties of Nb-V-Ti microalloyed cast steel automatic coupler are excellent.
Microalloyed steel
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