Zone of fatique crack growth of stainless steel: Structure-phase states evolution

S. V. Vorob'ev, A. V. Gromova, Yu F. Ivanov, S. V. Konovalov, K. D. Lukin

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The transmission electron microscopy was used to analyze formation of the structural phase states in the fatigue crack growth area in 08X18N10T austenite (0,1%C; 17,5%Cr; 10%N; 1%Ti) stainless steel subjected to highcycle fatigue. In the initial state up to 75% of the total volume was occupied by a chaotic dislocation substructure, the rest was shared in equal proportion by reticular and cellular-reticular substructures. Average scalar density of dislocations amounted to 1.5.1010cm-2. Carbide phase was represented by chromium carbides M23C6 sized 0.1-1 μm comprised of (FeCr)23C6 and TiC with average size of 62±5 nm. High-cycle fatigue testing resulted in higher (up to 5.2 *1010cm-2) scalar density of dislocations in the ruptured zone which increased share of material in the total volume with ordered dislocation substructures against the chaotic ones. In steel fractured after 170 thousand stress cycles the fatigue growth area has the following proportion of dislocation substructures: chaotic - 5%, reticular - 70%, cells and balls comprise the rest in equal proportion. In strained steel stacking faults and microtwins are formed, channels for slip and twinning steel deformation are triggered. Deformation twinning leads to martensite γ→ε transformation. Steel fatigue loading entails partial dissolution of carbides M23C6 near grain boundaries and isolation of Cr3C2 on carbide interlayer boundaries, as well as coagulation of TiC particles up to 120±7 nm in ruptured state. At the same time their size variety is substantially expanded. Microcracks form near carbide-matrix phase boundaries and within the volume of carbide phase particles that are some nanometers in size. Such locations are stress concentrators which lead to failure of the whole sample.

Original languageEnglish
Title of host publicationAdvances in Heterogeneous Material Mechanics 2008 - Proceedings of the 2nd International Conference on Heterogeneous Material Mechanics, ICHMM 2008
Pages435
Number of pages1
Publication statusPublished - 2008
EventAdvances in Heterogeneous Material Mechanics 2008 - 2nd International Conference on Heterogeneous Material Mechanics, ICHMM 2008 - Huangshan, China
Duration: 3 Jun 20088 Jun 2008

Other

OtherAdvances in Heterogeneous Material Mechanics 2008 - 2nd International Conference on Heterogeneous Material Mechanics, ICHMM 2008
CountryChina
CityHuangshan
Period3.6.088.6.08

Fingerprint

Stainless Steel
Steel structures
Carbides
Crack propagation
Stainless steel
Steel
Twinning
Fatigue of materials
Fatigue testing
Stacking faults
Microcracks
Phase boundaries
Chromium
Coagulation
Fatigue crack propagation
Martensite
Austenite
Dissolution
Grain boundaries
Transmission electron microscopy

Keywords

  • Dislocation substructure
  • Fatigue
  • Steel

ASJC Scopus subject areas

  • Materials Science (miscellaneous)
  • Materials Chemistry

Cite this

Vorob'ev, S. V., Gromova, A. V., Ivanov, Y. F., Konovalov, S. V., & Lukin, K. D. (2008). Zone of fatique crack growth of stainless steel: Structure-phase states evolution. In Advances in Heterogeneous Material Mechanics 2008 - Proceedings of the 2nd International Conference on Heterogeneous Material Mechanics, ICHMM 2008 (pp. 435)

Zone of fatique crack growth of stainless steel : Structure-phase states evolution. / Vorob'ev, S. V.; Gromova, A. V.; Ivanov, Yu F.; Konovalov, S. V.; Lukin, K. D.

Advances in Heterogeneous Material Mechanics 2008 - Proceedings of the 2nd International Conference on Heterogeneous Material Mechanics, ICHMM 2008. 2008. p. 435.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Vorob'ev, SV, Gromova, AV, Ivanov, YF, Konovalov, SV & Lukin, KD 2008, Zone of fatique crack growth of stainless steel: Structure-phase states evolution. in Advances in Heterogeneous Material Mechanics 2008 - Proceedings of the 2nd International Conference on Heterogeneous Material Mechanics, ICHMM 2008. pp. 435, Advances in Heterogeneous Material Mechanics 2008 - 2nd International Conference on Heterogeneous Material Mechanics, ICHMM 2008, Huangshan, China, 3.6.08.
Vorob'ev SV, Gromova AV, Ivanov YF, Konovalov SV, Lukin KD. Zone of fatique crack growth of stainless steel: Structure-phase states evolution. In Advances in Heterogeneous Material Mechanics 2008 - Proceedings of the 2nd International Conference on Heterogeneous Material Mechanics, ICHMM 2008. 2008. p. 435
Vorob'ev, S. V. ; Gromova, A. V. ; Ivanov, Yu F. ; Konovalov, S. V. ; Lukin, K. D. / Zone of fatique crack growth of stainless steel : Structure-phase states evolution. Advances in Heterogeneous Material Mechanics 2008 - Proceedings of the 2nd International Conference on Heterogeneous Material Mechanics, ICHMM 2008. 2008. pp. 435
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abstract = "The transmission electron microscopy was used to analyze formation of the structural phase states in the fatigue crack growth area in 08X18N10T austenite (0,1{\%}C; 17,5{\%}Cr; 10{\%}N; 1{\%}Ti) stainless steel subjected to highcycle fatigue. In the initial state up to 75{\%} of the total volume was occupied by a chaotic dislocation substructure, the rest was shared in equal proportion by reticular and cellular-reticular substructures. Average scalar density of dislocations amounted to 1.5.1010cm-2. Carbide phase was represented by chromium carbides M23C6 sized 0.1-1 μm comprised of (FeCr)23C6 and TiC with average size of 62±5 nm. High-cycle fatigue testing resulted in higher (up to 5.2 *1010cm-2) scalar density of dislocations in the ruptured zone which increased share of material in the total volume with ordered dislocation substructures against the chaotic ones. In steel fractured after 170 thousand stress cycles the fatigue growth area has the following proportion of dislocation substructures: chaotic - 5{\%}, reticular - 70{\%}, cells and balls comprise the rest in equal proportion. In strained steel stacking faults and microtwins are formed, channels for slip and twinning steel deformation are triggered. Deformation twinning leads to martensite γ→ε transformation. Steel fatigue loading entails partial dissolution of carbides M23C6 near grain boundaries and isolation of Cr3C2 on carbide interlayer boundaries, as well as coagulation of TiC particles up to 120±7 nm in ruptured state. At the same time their size variety is substantially expanded. Microcracks form near carbide-matrix phase boundaries and within the volume of carbide phase particles that are some nanometers in size. Such locations are stress concentrators which lead to failure of the whole sample.",
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N2 - The transmission electron microscopy was used to analyze formation of the structural phase states in the fatigue crack growth area in 08X18N10T austenite (0,1%C; 17,5%Cr; 10%N; 1%Ti) stainless steel subjected to highcycle fatigue. In the initial state up to 75% of the total volume was occupied by a chaotic dislocation substructure, the rest was shared in equal proportion by reticular and cellular-reticular substructures. Average scalar density of dislocations amounted to 1.5.1010cm-2. Carbide phase was represented by chromium carbides M23C6 sized 0.1-1 μm comprised of (FeCr)23C6 and TiC with average size of 62±5 nm. High-cycle fatigue testing resulted in higher (up to 5.2 *1010cm-2) scalar density of dislocations in the ruptured zone which increased share of material in the total volume with ordered dislocation substructures against the chaotic ones. In steel fractured after 170 thousand stress cycles the fatigue growth area has the following proportion of dislocation substructures: chaotic - 5%, reticular - 70%, cells and balls comprise the rest in equal proportion. In strained steel stacking faults and microtwins are formed, channels for slip and twinning steel deformation are triggered. Deformation twinning leads to martensite γ→ε transformation. Steel fatigue loading entails partial dissolution of carbides M23C6 near grain boundaries and isolation of Cr3C2 on carbide interlayer boundaries, as well as coagulation of TiC particles up to 120±7 nm in ruptured state. At the same time their size variety is substantially expanded. Microcracks form near carbide-matrix phase boundaries and within the volume of carbide phase particles that are some nanometers in size. Such locations are stress concentrators which lead to failure of the whole sample.

AB - The transmission electron microscopy was used to analyze formation of the structural phase states in the fatigue crack growth area in 08X18N10T austenite (0,1%C; 17,5%Cr; 10%N; 1%Ti) stainless steel subjected to highcycle fatigue. In the initial state up to 75% of the total volume was occupied by a chaotic dislocation substructure, the rest was shared in equal proportion by reticular and cellular-reticular substructures. Average scalar density of dislocations amounted to 1.5.1010cm-2. Carbide phase was represented by chromium carbides M23C6 sized 0.1-1 μm comprised of (FeCr)23C6 and TiC with average size of 62±5 nm. High-cycle fatigue testing resulted in higher (up to 5.2 *1010cm-2) scalar density of dislocations in the ruptured zone which increased share of material in the total volume with ordered dislocation substructures against the chaotic ones. In steel fractured after 170 thousand stress cycles the fatigue growth area has the following proportion of dislocation substructures: chaotic - 5%, reticular - 70%, cells and balls comprise the rest in equal proportion. In strained steel stacking faults and microtwins are formed, channels for slip and twinning steel deformation are triggered. Deformation twinning leads to martensite γ→ε transformation. Steel fatigue loading entails partial dissolution of carbides M23C6 near grain boundaries and isolation of Cr3C2 on carbide interlayer boundaries, as well as coagulation of TiC particles up to 120±7 nm in ruptured state. At the same time their size variety is substantially expanded. Microcracks form near carbide-matrix phase boundaries and within the volume of carbide phase particles that are some nanometers in size. Such locations are stress concentrators which lead to failure of the whole sample.

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