Structural Changes in Austenitic-Ferritic Steel 03Kh14N10K5M2Yu2T During Heating and Cooling

2018 ◽  
pp. 19-25
Author(s):  
L. Mal’tseva ◽  
A. Levina ◽  
T. Mal’tseva ◽  
V. Sharapova
Keyword(s):  
Ferritic Steel ◽  
Structural Changes ◽  
Heating And Cooling

Changes of Selected Structural and Mechanical Properties of the Strzelin Granites As Induced By Thermal Loads / Wpływ Obciążeń Termicznych Na Zmiany Niektórych Strukturalnych I Mechanicznych Właściwości Granitów Strzelińskich

2012 ◽  
Vol 57 (4) ◽  
pp. 951-974 ◽  
Author(s):  
Andrzej Nowakowski ◽  
Mariusz Młynarczuk
Keyword(s):  
Mechanical Properties ◽  
Nuclear Waste ◽  
Structural Changes ◽  
Structural Parameters ◽  
Total Porosity ◽  
Fracture Network ◽  
Qualitative Description ◽  
Temperature Changes ◽  
Heating And Cooling ◽  
Waste Repositories

Abstract Temperature is one of the basic factors influencing physical and structural properties of rocks. A quantitative and qualitative description of this influence becomes essential in underground construction and, in particular, in the construction of various underground storage facilities, including nuclear waste repositories. The present paper discusses the effects of temperature changes on selected mechanical and structural parameters of the Strzelin granites. Its authors focused on analyzing the changes of granite properties that accompany rapid temperature changes, for temperatures lower than 573ºC, which is the value at which the β - α phase transition in quartz occurs. Some of the criteria for selecting the temperature range were the results of measurements carried out at nuclear waste repositories. It was demonstrated that, as a result of the adopted procedure of heating and cooling of samples, the examined rock starts to reveal measurable structural changes, which, in turn, induces vital changes of its selected mechanical properties. In particular, it was shown that one of the quantities describing the structure of the rock - namely, the fracture network - grew significantly. As a consequence, vital changes could be observed in the following physical quantities characterizing the rock: primary wave velocity (vp), permeability coefficient (k), total porosity (n) and fracture porosity (η), limit of compressive strength (Rσ1) and the accompanying deformation (Rε1), Young’s modulus (E), and Poisson’s ratio (ν).

scholarly journals Viscosity of CuPb, CuPbSn, CuPbSnGa and CuPbSnGaBi melts of equiatomic compositions

2019 ◽  
Vol 25 (1) ◽  
pp. 33
Author(s):  
Olga Chikova ◽  
Vladimir Tsepelev ◽  
Kseniya Shmakova
Keyword(s):  
Optical Microscopy ◽  
Structural Changes ◽  
Ternary Eutectic ◽  
Equiatomic Composition ◽  
Structural Components ◽  
Melt Structure ◽  
High Entropy ◽  
Heating And Cooling ◽  
Temperature Dependences ◽  
Specific Temperature

<p class="AMSmaintext">We investigated the viscosity of CuPb, CuPbSn, CuPbSnGa and CuPbSnGaBi melts of equiatomic compositions by the method of damped torsion vibrations of a crucible. We see the melts of equiatomic composition as the melts high-entropy. All the investigated melts demonstrated the different temperature dependences of viscosity for heating and cooling. There is an anomalous reduction in viscosity resulted when the melt is heated to a specific temperature. The anomalous behaviour for viscosity we interpreted in terms of melt structure. This structural changes in the melt resulted when the melt is heated to a specific temperature.  The microstructure of CuPbSnGaBi ingot of equiatomic composition we investigated using optical microscopy and measurement of microhardness. Collations data of the microstructures with of the microhardness gave three structural components: CuGa<sub>2</sub> dendrites, (Sn) + (Bi) + Bi<sub>3</sub>Pb<sub>7</sub> ternary eutectic and rounded Pb inclusions having dimensions of  »5 mm.</p>

Structural Changes of Soymilk Proteins during Heating and Cooling, and Freeze-Gelation of Soymilk

2003 ◽  
pp. 290-299
Author(s):  
Makoto Shimoyamada ◽  
Kayoko Tômatsu ◽  
Satomi Oku ◽  
Wataru Koseki ◽  
Kenji Watanabe
Keyword(s):  
Structural Changes ◽  
Heating And Cooling

Phases and Structure Characteristics of the Near Eutectic Al-Sl-Cu Alloy Using Derivative Thermo Analysis

2010 ◽  
Vol 638-642 ◽  
pp. 475-480 ◽  
Author(s):  
Leszek Adam Dobrzański ◽  
Mariusz Krupinski ◽  
Krzysztof Labisz ◽  
Beata Krupinska ◽  
Adam Grajcar
Keyword(s):  
Structural Changes ◽  
Cast Alloy ◽  
Ternary Eutectic ◽  
Heating And Cooling ◽  
Cu Alloy ◽  
Electron Scanning Microscopy ◽  
Cooling Speed ◽  
Alloy Microstructure ◽  
Liquid Metal Processing ◽  
Iron And Manganese

For determining of the micro-structural changes taking place in a near eutectic Al-Si-Cu aluminium cast alloy during heating and cooling process the UMSA device (Universal Metallurgical Simulator and Analyzer) was used. In this work the dependence between the regulated cooling speed and structure on the basis of the thermo-analysis was carried out. The thermal analysis was performed at a cooling rate in a range of 0,2 °C to 1,25 °C. The changes were examined and evaluated qualitatively by optical and electron scanning microscopy methods and the EDS microanalysis. During the investigation the formation of aluminium reach (α-Al) dendrites was revealed and also the occurrence of the α+β eutectic, the ternary eutectic α+Al2Cu+β, as well a iron and manganese containing phase was confirmed. The performed investigation are discussed for the reason of an possible improvement of thermal and structural properties of the alloy. The achieved results can be used for liquid metal processing in science and industry – for example foundry for developing and obtaining of a required alloy microstructure and properties influenced by a proper production conditions.

Adjustment of Solid-Solid Phase Transition Temperature of Polyalcohols by the Use of Dopants*

1985 ◽  
Vol 29 ◽  
pp. 305-313 ◽  
Author(s):  
D. Chandra ◽  
C. S. Barrett ◽  
D. K. Benson
Keyword(s):  
Boron Trifluoride ◽  
Structural Changes ◽  
Solid Phase ◽  
Phase Changes ◽  
Transition Temperatures ◽  
Plastic Crystals ◽  
Potential Value ◽  
Heating And Cooling ◽  
Enthalpy Changes ◽  
Solid Phase Transition

AbstractThe transition temperatures of solid-solid phase changes in selected polyalcohols, “plastic crystals,” can be adjusted by using interstitial and substitutional dopants. An investigation is under way of the structural changes in these during heating and cooling, and of the thermodynamic properties such as the transition, temperatures and enthalpy changes, as a function of the percent of dopant. The purpose of the investigation is to find and evaluate materials having potential value In thermal storage applications. Dopants for pentaerythritol discussed in this report are trimethylolpropane (TMP), ammonia, boron trifluoride, pentaglycerine (PG) and neopentylglycol (NPG).

scholarly journals VISCOSITY OF CuPb, CuPbSn, CuPbSnGa AND CuPbSnGaBi MELTS OF EQUIATOMIC COMPOSITIONS

2021 ◽  
Vol 25 (1) ◽  
pp. 33-40
Author(s):  
Olga Chikova ◽  
Vladimir Tsepelev ◽  
Kseniya Shmakova
Keyword(s):  
Optical Microscopy ◽  
Structural Changes ◽  
Ternary Eutectic ◽  
Equiatomic Composition ◽  
Structural Components ◽  
Melt Structure ◽  
High Entropy ◽  
Heating And Cooling ◽  
Temperature Dependences ◽  
Specific Temperature

We investigated the viscosity of CuPb, CuPbSn, CuPbSnGa and CuPbSnGaBi melts of equiatomic compositions by the method of damped torsion vibrations of a crucible. We saw the melts of equiatomic composition as the melts high-entropy. All the investigated melts demonstrated the different temperature dependences of viscosity for heating and cooling. There is an anomalous reduction in viscosity resulted when the melt is heated to a specific temperature. The anomalous behaviour for viscosity we interpreted in terms of melt structure. This structural changes in the melt resulted when the melt is heated to a specific temperature. The microstructure of CuPbSnGaBi ingot of equiatomic composition we investigated using optical microscopy and measurement of microhardness. Collations data of the microstructures with of the microhardness gave three structural components: CuGa2 dendrites, (Sn) + (Bi) + Bi3Pb7 ternary eutectic and rounded Pb inclusions having dimensions of 5 m.

Raman spectroscopic studies on the structural changes of poly(3-methylthiophene) during heating and cooling processes

2002 ◽  
Vol 47 (21) ◽  
pp. 1791-1793
Author(s):  
Feng’en Chen ◽  
Jiaxin Zhang ◽  
Mingxiao Fu ◽  
Gaoquan Shi
Keyword(s):  
Structural Changes ◽  
Spectroscopic Studies ◽  
Raman Spectroscopic ◽  
Heating And Cooling
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