Synchronously improved fatigue strength and fatigue crack growth resistance in twinning-induced plasticity steels

The tensile, high-cycle fatigue (HCF) and fatigue crack growth (FCG) rate tests of Fe-30Mn-0.9C and Fe-30Mn-0.3C twinning-induced plasticity (TWIP) steels were performed. Meanwhile, the corresponding surface damages, fatigue fracture morphologies and microstructure evolutions were also investigated....

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2018-01, Vol.711, p.533-542
Main Authors: Wang, B., Zhang, P., Duan, Q.Q., Zhang, Z.J., Yang, H.J., Pang, J.C., Tian, Y.Z., Li, X.W., Zhang, Z.F.
Format: Article
Language:English
Subjects:
Crack propagation
Fatigue
Fatigue crack growth
Fatigue failure
Fatigue strength
Fatigue tests
Fracture mechanics
Fractures
High cycle fatigue
Manganese
Materials science
Materials selection
Microstructure
Plasticity
Short range order
Slip planarity
Steel
Twinning induced plasticity (TWIP) steel
TWIP steels
Yield strength
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Summary:The tensile, high-cycle fatigue (HCF) and fatigue crack growth (FCG) rate tests of Fe-30Mn-0.9C and Fe-30Mn-0.3C twinning-induced plasticity (TWIP) steels were performed. Meanwhile, the corresponding surface damages, fatigue fracture morphologies and microstructure evolutions were also investigated. It is detected that both the fatigue strength and FCG resistance of Fe-30Mn-0.9C steel are higher than those of Fe-30Mn-0.3C steel, because Fe-30Mn-0.9C steel possesses higher yield strength, plasticity and slip planarity than Fe-30Mn-0.3C steel. Furthermore, it is proposed that, for the Fe-Mn-C TWIP steel, increasing the C content to enhance the short range order (SRO) would lead to the synchronous increment in the fatigue strength and FCG resistance. This study may have a certain guiding significance for the selection of materials to against fatigue fracture.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2017.11.074