A new method to predict mechanical properties for microalloyed steels via industrial data and mechanism analysis

The paper deals with modification of cement composite and concrete with nanocellulose in low and high density. The author presents the study results of the influence of nanocellulose on the cement composite hardening process, as well as the physical and mechanical properties of heavy concrete. The influence of the used additive on the rheological and strength characteristics of concrete is revealed. A new method is proposed to improve the material performance.

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New Method for Diagnostic of Heat Engineering and Mechanical Properties of Cellular Concrete

International Journal of Engineering and Advanced Technology - Regular Issue ◽

10.35940/ijeat.a2993.109119 ◽

2019 ◽

Vol 9 (1) ◽

pp. 6885-6887

Keyword(s):

Mechanical Properties ◽

Thermal Conductivity ◽

Information Technology ◽

Optical Method ◽

New Method ◽

Modern Approach ◽

Heat Engineering ◽

Aerated Concrete ◽

Pore Arrangement ◽

Cellular Concrete

The article presents the results of studies assessing the structure of cellular concrete using a photo-optical method based on the use of a modern approach from the standpoint of information technology. Based on the photo-optical method, a reverse formulation of the problem is also possible: on the basis of a given percentage of porosity of the material, obtain the most optimal pore arrangement (type of packaging) that meets the specified strength and thermal conductivity of aerated concrete. Having a specific type of image of aerated concrete obtained as a result of modeling, otherwise, a specific type of packing of pores of certain sizes that meets the required (specified) characteristics, then, we can set the technological task of obtaining it.

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Effect of the Time between Last Deformation Pass and Accelerated Cooling on the Mechanical Properties in Nb and Nb-Mo Microalloyed Steels

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.716.281 ◽

2016 ◽

Vol 716 ◽

pp. 281-290

Author(s):

Gorka Larzabal ◽

Nerea Isasti ◽

J.M. Rodriguez-Ibabe ◽

Isabel Gutiérrez ◽

P. Uranga

Keyword(s):

Mechanical Properties ◽

Charpy Impact ◽

Holding Time ◽

Microalloyed Steels ◽

Accelerated Cooling ◽

Low Carbon ◽

Compression Tests ◽

Electron Backscattered Diffraction ◽

Microstructural Refinement ◽

Deformation Pass

The microstructural refinement induced when the holding time between last deformation pass and accelerated cooling is reduced, affects the mechanical properties in low carbon Nb and Nb-Mo microalloyed steels. Plane strain compression tests were performed and mechanical property samples machined in order to quantify this effect using tensile and Charpy impact tests. A complete microstructural characterization was carried out using electron backscattered diffraction (EBSD) measuring unit size distributions and homogeneity of complex microstructures. The synergetic combination of Nb and Mo elements modifies the final microstructures and, therefore, affects the contribution of different strengthening mechanisms, such as substructure, precipitation hardening and dislocation density. Even though strength is not clearly affected by the reduction of the holding time after the last deformation pass, Charpy properties are considerably improved in the case of the Nb steel. The presence of MA islands in the Nb-Mo steel limits the beneficial effect of the microstructural refinement and toughness remains unmodified.

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