Thermodynamic Approach to the Development and Selection of Hardfacing Materials in Energy Industry

Abstract

<jats:title>Abstract</jats:title><jats:p>The overall study objection is selection and optimization all available thermodynamic data required for using calculation of phase diagram (CALPHAD) technique within the Fe-C-Cr-Mn-Si-Ti system. Such data collected in the thermodynamic database can be used for predicting the phase constitution states of a given composition for Fe-based hardfacing materials, which often use in energy industry in order to increase the abrasion and impact wear resistance of equipment parts. In order to compare theroretical calculation results with experimental data, four different types of hardfacing were deposited using flux-cored arc welding. Microstructure and chemical composition of deposited layers was investigated using optical and scanning electron microscopy together with energy dispersive X-ray spectroscopy. Comparison of experimental and computed results shows that they are in good agreement in meaning of presence of all-important phase equilibrium regions. The developed database can be used for rational selection of hardfacing materials for energy industry equipment and reasonable choice of new alloying systems.</jats:p>

Development of the material homogeneity criterion for the analysis of processes of technological inheritability for quality parameters of machine parts

“…Technological damageability D (9) is interpreted as the ratio of the difference in the Weibull coefficients of the base material and in the i-th section of the part to the Weibull coefficient of the base material. At the same time, the intensity of of growth of technological damageability jD (10) is the ratio of the difference in the Weibull coefficients of the base material and in the i-th cross-section of the part to the Weibull coefficient in the i-th cross-section of the part.…”

“…The service life of machines is closely related to the physical, chemical and mechanical properties of materials and coatings [10,11], accuracy indicators [12,13] and quality characteristics of the surface layers of the functional surfaces of parts [14,15], including taking into account technological inheritability [7], during the Life Cycles of the mechanical engineering parts [8].…”

Development of the material homogeneity criterion for the analysis of processes of technological inheritability for quality parameters of machine parts

“…Technological damageability D (9) is interpreted as the ratio of the difference in the Weibull coefficients of the base material and in the i-th section of the part to the Weibull coefficient of the base material. At the same time, the intensity of of growth of technological damageability jD (10) is the ratio of the difference in the Weibull coefficients of the base material and in the i-th cross-section of the part to the Weibull coefficient in the i-th cross-section of the part.…”

“…The service life of machines is closely related to the physical, chemical and mechanical properties of materials and coatings [10,11], accuracy indicators [12,13] and quality characteristics of the surface layers of the functional surfaces of parts [14,15], including taking into account technological inheritability [7], during the Life Cycles of the mechanical engineering parts [8].…”

Analysis of the effects of alloying with Si and Cr on the properties of manganese austenite based on AB INITIO modelling

“…Thermodynamic calculations were carried out using the CALPHAD (CALculation of PHAse Diagrams) procedure employing the OpenCalphad programming code [25] and the thermodynamic functions given in works [26][27][28].…”

Restoration of the Impact Crusher Rotor Using FCAW with High-Manganese Steel Reinforced by Complex Carbides

“…Another effective improvement in repair technology is, in particular, the use of new tungsten-free alloys for the restoration of worn surfaces of parts by surfacing. Theoretical approaches to the development of such new compositions of wear-resistant alloys are considered in papers [58,59,60,61]. The authors [62,63] investigated the influence of the filling factor of powder electrodes and exothermic applications on stable arc combustion during electric arc welding of coatings with powder electrodes.…”

Development of the material homogeneity criterion for the analysis of processes of technological inheritability for quality parameters of machine parts

“…Technological damageability D (9) is interpreted as the ratio of the difference in the Weibull coefficients of the base material and in the i-th section of the part to the Weibull coefficient of the base material. At the same time, the intensity of of growth of technological damageability jD (10) is the ratio of the difference in the Weibull coefficients of the base material and in the i-th cross-section of the part to the Weibull coefficient in the i-th cross-section of the part.…”

“…The service life of machines is closely related to the physical, chemical and mechanical properties of materials and coatings [10,11], accuracy indicators [12,13] and quality characteristics of the surface layers of the functional surfaces of parts [14,15], including taking into account technological inheritability [7], during the Life Cycles of the mechanical engineering parts [8].…”

Analysis of the effects of alloying with Si and Cr on the properties of manganese austenite based on AB INITIO modelling

“…Thermodynamic calculations were carried out using the CALPHAD (CALculation of PHAse Diagrams) procedure employing the OpenCalphad programming code [25] and the thermodynamic functions given in works [26][27][28].…”

Restoration of the Impact Crusher Rotor Using FCAW with High-Manganese Steel Reinforced by Complex Carbides

“…Another effective improvement in repair technology is, in particular, the use of new tungsten-free alloys for the restoration of worn surfaces of parts by surfacing. Theoretical approaches to the development of such new compositions of wear-resistant alloys are considered in papers [58,59,60,61]. The authors [62,63] investigated the influence of the filling factor of powder electrodes and exothermic applications on stable arc combustion during electric arc welding of coatings with powder electrodes.…”

Development of the material homogeneity criterion for the analysis of processes of technological inheritability for quality parameters of machine parts

“…Technological damageability D (9) is interpreted as the ratio of the difference in the Weibull coefficients of the base material and in the i-th section of the part to the Weibull coefficient of the base material. At the same time, the intensity of of growth of technological damageability jD (10) is the ratio of the difference in the Weibull coefficients of the base material and in the i-th cross-section of the part to the Weibull coefficient in the i-th cross-section of the part.…”

“…The service life of machines is closely related to the physical, chemical and mechanical properties of materials and coatings [10,11], accuracy indicators [12,13] and quality characteristics of the surface layers of the functional surfaces of parts [14,15], including taking into account technological inheritability [7], during the Life Cycles of the mechanical engineering parts [8].…”

Analysis of the effects of alloying with Si and Cr on the properties of manganese austenite based on AB INITIO modelling

“…Thermodynamic calculations were carried out using the CALPHAD (CALculation of PHAse Diagrams) procedure employing the OpenCalphad programming code [25] and the thermodynamic functions given in works [26][27][28].…”

Restoration of the Impact Crusher Rotor Using FCAW with High-Manganese Steel Reinforced by Complex Carbides

“…Another effective improvement in repair technology is, in particular, the use of new tungsten-free alloys for the restoration of worn surfaces of parts by surfacing. Theoretical approaches to the development of such new compositions of wear-resistant alloys are considered in papers [58,59,60,61]. The authors [62,63] investigated the influence of the filling factor of powder electrodes and exothermic applications on stable arc combustion during electric arc welding of coatings with powder electrodes.…”