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作者:

Gong, Liqiang (Gong, Liqiang.) | Du, Hejun (Du, Hejun.) | Absi, Rafik (Absi, Rafik.) | Huang, Longxiao (Huang, Longxiao.) | Fu, Hanguang (Fu, Hanguang.) (学者:符寒光)

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EI Scopus SCIE

摘要:

The corrosive wear resistance of copper-bearing HHCCI was tested through experiments and HRTEM, combined with first-principles calculations to study the atomic structure, interface fracture work, thermodynamic stability, electronic structure and bonding structure of six Fe3Cr4C3(01 1 0)/gamma-Fe(101) interface models with different termination methods. The HRTEM results show that the interface formed by (01 1 0) of M7C3-type carbide and (101) of the austenite matrix is a coherent interface. The first principles calculation results show that the interface formed by the Fe3Cr4C3(01 1 0)-Cr termination model and the gamma- Fe (101)-2 termination model has the highest interface bonding strength. The Fe-end/7Fe-2 interface model is the most stable. Both the interfacial chemical energy and the interfacial elastic energy will affect the overall thermodynamic stability of the Fe3Cr4C3(01 1 0)/gamma-Fe (101) interface. The fracture work of Fe3Cr4C3(01 1 0) and gamma- Fe (101) is greater than the corresponding interface adhesion work. Moreover, the fracture work on each terminal end of M7C3 along the (01 1 0) surface is higher than that on each terminal end of gamma- Fe along the (101) surface. The failure of HHCCI during corrosive wear may mainly occur in the interface area or the side close to the gamma- Fe matrix. The chemical bonds in the Fe-end/7Fe interface are mainly Fe-Fe metal bonds, Fe-Cr metal bonds and some Fe-C polar covalent bonds. The chemical bonds in the Cr-end/7Fe interface are mainly Cr-Fe metal bonds and some Cr-C polar covalent bonds. The chemical bonds in the C-end/7Fe interface are mainly composed of Cr-Fe metal bonds, C-Fe polar covalent bonds and part of C-Cr polar covalent bonds, as a result, each interface exhibits different corrosive wear resistance potentials.

关键词:

Hypereutectic high chromium cast iron First principles calculation Corrosive wear resistance Interface

作者机构:

  • [ 1 ] [Gong, Liqiang]Beijing Univ Technol, Sch Mat Sci & Engn, Key Lab Adv Funct Mat, Minist Educ, Beijing 100124, Peoples R China
  • [ 2 ] [Huang, Longxiao]Beijing Univ Technol, Sch Mat Sci & Engn, Key Lab Adv Funct Mat, Minist Educ, Beijing 100124, Peoples R China
  • [ 3 ] [Fu, Hanguang]Beijing Univ Technol, Sch Mat Sci & Engn, Key Lab Adv Funct Mat, Minist Educ, Beijing 100124, Peoples R China
  • [ 4 ] [Gong, Liqiang]Nanyang Technol Univ, Sch Mech & Aerosp Engn, Singapore 639798, Singapore
  • [ 5 ] [Du, Hejun]Nanyang Technol Univ, Sch Mech & Aerosp Engn, Singapore 639798, Singapore
  • [ 6 ] [Gong, Liqiang]ECAM EPMI, LR2E Lab, Lab Quartz, 13 Blvd Hautil, F-95092 Cergy Pontoise, France
  • [ 7 ] [Absi, Rafik]ECAM EPMI, LR2E Lab, Lab Quartz, 13 Blvd Hautil, F-95092 Cergy Pontoise, France

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来源 :

INTERMETALLICS

ISSN: 0966-9795

年份: 2024

卷: 175

4 . 4 0 0

JCR@2022

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