Dilatometric analysis tool steel X153CrMoV12

2021 ◽  
Vol 16 (1) ◽  
pp. 14-18
Author(s):  
Michal Krbaťa ◽  
◽  
Róbert Cíger ◽  
Keyword(s):  
Experimental Data ◽  
Phase Transformations ◽  
Tool Steel ◽  
High Strength ◽  
Cooling Curve ◽  
Analysis Tool ◽  
Heat Treatment Regime ◽  
Temperature Ranges ◽  
Continuous Cooling Transformation Diagram

The article deals with phase transformations and austenitizing behavior of the X155CrMoV12 tool steel. Dilatation analyses of a series of samples were performed at various cooling rates, chosen in the range from 10 °C·s-1 to 0.1 °C·s-1. Acquired experimental data were used for evaluation of dilatometric curves in order to map the temperature ranges of phase transformations of the austenite to pearlite, bainite or martensite. All experimental samples from dilatometric analyses were then subjected to microstructural analyses and hardness measurements to characterize the microstructure and hardness for every tested heat treatment regime. The second part of this article, entitled "EXPERIMENTAL DETERMINATION OF CONTINUOUS COOLING TRANSFORMATION DIAGRAM FOR HIGH STRENGTH STEEL X153CRMOV12", deals with these analyses of the cooling curve microstructure.

scholarly journals Experimental determination of continuous cooling transformation diagram for high strength steel X153CrMoV12

2021 ◽  
Vol 16 (1) ◽  
pp. 19-24
Author(s):  
Michal Krbaťa ◽  
◽  
Róbert Cíger ◽  
Keyword(s):  
Experimental Data ◽  
Heat Treatment ◽  
High Strength Steel ◽  
Microstructural Analysis ◽  
High Strength ◽  
Cooling Curves ◽  
Treatment Mode ◽  
Heat Treatment Mode ◽  
Continuous Cooling Transformation Diagram

The article is a continuation of the article ,DILATOMETRIC ANALYSIS OF COOLING CURVES FOR HIGH STRENGTH STEEL X153CrMoV12”, which deals with the phase transformations of tool steel X153CrMoV12. The experimental data obtained was used to evaluate the resulting CCT diagram, which consists of seven dilation curves. All experimental samples from dilatometric analyses were then subjected to microstructural analysis and hardness measurements to characterize the microstructure and hardness for each heat treatment mode tested. AFM microscopy was also used to study the carbides present in steels and their size and shape for all selected cooling modes.

In situ Temperature Measurement During Spray Forming of A2-tool Steel and Axisymmetric Two-dimensional Analysis

2000 ◽  
Vol 15 (8) ◽  
pp. 1669-1678 ◽  
Author(s):  
B. C. Moon ◽  
Z. H. Lee ◽  
D. R. White ◽  
E. J. Lavernia
Keyword(s):  
Experimental Data ◽  
Temperature Measurement ◽  
Tool Steel ◽  
Video Camera ◽  
Spray Forming ◽  
Cooling Curve ◽  
Two Dimensional ◽  
Forming Process ◽  
Infrared Video

An in situ temperature measurement was performed during spraying of A2-tool steel, and the results were used to verify an axisymmetric two-dimensional computer simulation program, which was developed for the prediction of shape and temperature variation in a spray-forming process. A thin thermocouple was placed inside of the chamber in advance and brought to the surface of the deposit during spraying. The temperature was then recorded. The surface temperature of the deposit was also measured by an infrared video camera. The emissivity of the surface of A2-tool steel during spraying was determined to be 0.23 through comparison of the temperatures measured by the thermocouple with the ones measured by the infrared video camera. The heat transfer coefficient at the top surface was estimated by comparing the calculated results with the experimental data. The cooling curve predicted on the basis of the numerical simulation showed good agreement with the experimental data.

scholarly journals On Experimental Thermal Analysis of Solid Materials

2014 ◽  
Vol 14 (6) ◽  
pp. 317-322 ◽  
Author(s):  
Pavel Koštial ◽  
Ivo Špička ◽  
Zora Jančikova ◽  
Jan Valiček ◽  
Marta Harničarova ◽  
...  
Keyword(s):  
Experimental Data ◽  
Thermal Conductivity ◽  
Thermal Analysis ◽  
Heat Capacity ◽  
Cooling Curve ◽  
Solid Materials ◽  
Experimental Conditions ◽  
Capacitance Model ◽  
Special Case

Abstract The paper is devoted to the presentation of a method for measurement of thermal conductivity k, specific heat capacity cp, and thermal diffusivity applying the lumped capacitance model (LCM) as a special case of Newton’s model of cooling. At the specific experimental conditions resulting from the theoretical analysis of the used model, we present a method for experimental determination of all three above mentioned thermal parameters for materials with different thermal transport properties. The input experimental data provide a cooling curve of the tested material. The evaluation of experimental data is realized by software, the fundamental features of which are presented here. The statistical analysis of experimental data was performed.

Numerical Models of Hardening Phenomena of Tools Steel Base on the TTT and CCT Diagrams

2011 ◽  
Vol 56 (2) ◽  
pp. 325-344 ◽  
Author(s):  
T. Domański ◽  
A. Bokota
Keyword(s):  
Finite Elements ◽  
Phase Transformations ◽  
Tool Steel ◽  
Numerical Models ◽  
Stress And Strain ◽  
Steel Base ◽  
Thermal Phenomena ◽  
Cct Diagrams ◽  
Mechanical Phenomena

Numerical Models of Hardening Phenomena of Tools Steel Base on the TTT and CCT DiagramsIn work the presented numerical models of tool steel hardening processes take into account thermal phenomena, phase transformations and mechanical phenomena. Numerical algorithm of thermal phenomena was based on the Finite Elements Methods in Galerkin formula of the heat transfer equations. In the model of phase transformations, in simulations heating process, isothermal or continuous heating (CHT) was applied, whereas in cooling process isothermal or continuous cooling (TTT, CCT) of the steel at issue. The phase fraction transformed (austenite) during heating and fractions of ferrite, pearlite or bainite are determined by Johnson-Mehl-Avrami formulas. The nescent fraction of martensite is determined by Koistinen and Marburger formula or modified Koistinen and Marburger formula. In the model of mechanical phenomena, apart from thermal, plastic and structural strain, also transformations plasticity was taken into account. The stress and strain fields are obtained using the solution of the Finite Elements Method of the equilibrium equation in rate form. The thermophysical constants occurring in constitutive relation depend on temperature and phase composite. For determination of plastic strain the Huber-Misses condition with isotropic strengthening was applied whereas for determination of transformation plasticity a modified Leblond model was used. In order to evaluate the quality and usefulness of the presented models a numerical analysis of temperature field, phase fraction, stress and strain associated hardening process of a fang lathe of cone shaped made of tool steel was carried out.

Determination of Junction-to-Case Thermal Resistance from One Transient Cooling Curve

2019 ◽  
Vol 24 (1) ◽  
pp. 30-41
Author(s):  
Natalia L. Еvdokimova ◽  
◽  
Vladimir V. Dolgov ◽  
Kirill A. Ivanov ◽  
◽  
...  
Keyword(s):  
Thermal Resistance ◽  
Cooling Curve
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