Effects of ε-martensitic transformation on crack tip deformation, plastic damage accumulation, and slip plane cracking associated with low-cycle fatigue crack growth
Source abstract
Abstract
Abstract Fatigue crack propagation behavior and associated plastic strain evolution in the vicinity of crack planes were investigated at different crack lengths for Fe-30Mn-6Al, Fe-30Mn-4Si-2Al, and Fe-30Mn-6Si alloys. In particular, fractographic analyses and electron backscatter diffraction measurements underneath the fracture surfaces were carried out. It was found that austenite of the Fe-30Mn-6Al alloy was completely stable at ambient temperature, and the Fe-30Mn-6Si and Fe-30Mn-4Si-2Al alloys showed deformation-induced e-martensitic transformation. Both the Fe-30Mn-4Si-2Al and Fe-30Mn-6Si alloys showed γ/e interface cracking. However, ductile cracking was observed in the former, while the latter showed brittle-like cracking. Additionally, both the Fe-30Mn-4Si-2Al and Fe-30Mn-6Al alloys showed ductile fatigue striation when the cracks became long, but the critical crack length to induce the striations in the Fe-30Mn-4Si-2Al alloy was longer than that in the Fe-30Mn-6Al. In contrast, the Fe-30Mn-6Si alloy did not show striation, not even just before failure. These observations are all related to e-martensite transformation. In terms of the crack tip deformation, the key roles of e-martensitic transformation are (1) brittle-like cracking along the γ/e interface, (2) inhibition of fatigue damage accumulation, and (3) geometrical constraint of e-martensite crystallographic structure at a fatigue crack tip. When e-martensite is ductile, such as in the case of the Fe-30Mn-4Si-2Al alloy, the brittle-like cracking does not occur. Because of the roles (2) and (3) mentioned above, the Fe-30Mn-4Si-2Al alloy showed the lowest fatigue crack growth compared to the other tested alloys. This paper presents the proposed e-martensite-related crack growth mechanism in detail.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Microstructure and Mechanical Properties of Steels · Metal Alloys Wear and Properties · Hydrogen embrittlement and corrosion behaviors in metals
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (41)
Show source-provided references
1. Twinning and strain-induced F.C.C.→H.C.P. transformation in the Fe-Mn-Cr-C system10.1016/0025-5416(77)90093-3 ↗
2. Effects of Si on tensile properties associated with deformation-induced ε-martensitic transformation in high mn austenitic alloys10.2320/matertrans.M2015042 ↗
3. Metastable high-entropy dual-phase alloys overcome the strength-ductility trade-off10.1038/nature17981 ↗
4. High strength Fe–Mn–(Al, Si) TRIP/TWIP steels development – properties – application10.1016/S0749-6419(00)00015-2 ↗
5. Revealing the strain-hardening behavior of twinning-induced plasticity steels: theory, simulations, experiments10.1016/j.actamat.2012.09.064 ↗
6. TWIP effect and plastic instability condition in an Fe–Mn–C austenitic steel10.2355/isijinternational.53.323 ↗
7. Influence of Al on shape memory effect and twinning induced plasticity of Fe-Mn-Si-Al system alloy10.2320/matertrans.MRA2007124 ↗
8. The effects of thermomechanical training treatment on the deformation characteristics of Fe–Mn–Si–Al alloys10.1016/j.msea.2008.07.026 ↗
9. Microstructural dependence of Fe-high Mn tensile behavior10.1007/BF02643961 ↗
10. Work hardening associated with ɛ-martensitic transformation, deformation twinning and dynamic strain aging in Fe–17Mn–0.6C and Fe–17Mn–0.8C TWIP steels10.1016/j.msea.2011.06.011 ↗
11. Strain hardening behavior of a Fe–18Mn–0.6C–1.5Al TWIP steel10.1016/j.msea.2009.08.028 ↗
12. Quasi-cleavage fracture along annealing twin boundaries in a Fe-Mn-C austenitic steel10.2355/isijinternational.52.161 ↗
13. Premature fracture mechanism in an Fe-Mn-C austenitic steel10.1007/s11661-012-1220-7 ↗
14. Influence of carbon content on the microstructure, martensitic transformation and mechanical properties in austenite/ε-martensite dual-phase Fe–Mn–C steels10.1016/j.actamat.2012.09.078 ↗
15. Effect of alloying composition on low-cycle fatigue properties and microstructure of Fe–30Mn–(6−x)Si–xAl TRIP/TWIP alloys10.1016/j.msea.2013.08.061 ↗
16. Designing Fe–Mn–Si alloys with improved low-cycle fatigue lives10.1016/j.scriptamat.2014.11.024 ↗
17. Effect of γ to ε martensitic transformation on low-cycle fatigue behaviour and fatigue microstructure of Fe–15Mn–10Cr–8Ni–xSi austenitic alloys10.1016/j.actamat.2015.12.002 ↗
18. Effect of strain amplitude on the low-cycle fatigue behavior of a new Fe–15Mn–10Cr–8Ni–4Si seismic damping alloy10.1016/j.ijfatigue.2016.03.021 ↗
19. Design concept and applications of Fe-Mn-Si-based alloys-from shape-memory to seismic response control10.2320/matertrans.MB201510 ↗
20. Vibration mitigation by the reversible fcc/hcp martensitic transformation during cyclic tension–compression loading of an Fe–Mn–Si-based shape memory alloy10.1016/j.scriptamat.2006.02.013 ↗
21. Mechanism of reversible transformation-induced plasticity of Fe–Mn–Si shape memory alloys10.1016/j.scriptamat.2008.06.030 ↗
22. Importance of crack-propagation-induced ε-martensite in strain-controlled low-cycle fatigue of high-Mn austenitic steel
23. In situ microscopic observations of low-cycle fatigue-crack propagation in high-Mn austenitic alloys with deformation-induced ε-martensitic transformation10.1016/j.actamat.2016.04.042 ↗
24. Positive and negative effects of hydrogen on tensile behavior in polycrystalline Fe–30Mn–(6−x) Si–xAl austenitic alloys10.1016/j.scriptamat.2015.05.007 ↗
25. Characteristics of hydrogen-assisted intergranular fatigue crack growth in interstitial-free steel: role of plastic strain localization
26. Impact of Mn–C couples on fatigue crack growth in austenitic steels: Is the attractive atomic interaction negative or positive?10.1016/j.ijfatigue.2017.02.009 ↗
27. Microscopic observation of the brittle-striation formation mechanism in low carbon steel fatigued in hydrogen gas (TEM and EBSD observation corresponding to fractography)10.1299/jmmp.5.179 ↗
28. Initial stages of damage in high stress fatigue in some pure metals10.1080/14786436308209084 ↗
29. Fatigue damage and crack growth in aluminium alloys10.1016/0001-6160(63)90008-7 ↗
30. Effect of Si and Al additions on the low temperature toughness and fracture mode of Fe-27Mn alloys10.2355/isijinternational.30.632 ↗
31. New experiments concerning the slip processes at propagating fatigue cracks—I10.1016/0001-6160(74)90071-6 ↗
32. AFM and SEM observation on mechanism of fatigue crack growth in an Fe-Si single crystal10.1023/A:1014211617958 ↗
33. Fatigue crack growth along planar slip bands10.1016/0001-6160(84)90229-3 ↗
34. Remarkable improvement of shape memory effect in Fe-Mn-Si based shape memory alloys by producing NbC precipitates10.1016/S1359-6462(01)00978-2 ↗
35. Remarkable improvement of shape memory effect in an Fe–Mn–Si–Cr–Ni–C alloy through controlling precipitation direction of Cr23C610.1016/j.msea.2007.05.043 ↗
36. A general mechanism of martensitic nucleation: Part I. General concepts and the FCC→HCP transformation
37. In-situ observation of partial dislocation motion during γ→ε; transformation in a Fe–Mn–Si shape memory alloy10.2320/matertrans1989.33.253 ↗
38. Ogawa K, Sawaguchi T, Kikuchi T, Koyama M, Murakami M. Influence of al concentration on deformation behavior and fracture mode of Fe-30Mn-6 (SI, AL) alloys. In: International conference on shape memory and superelastic technologies, SMST-2007; 2008.
39. Effect of Si on the reversibility of stress-induced martensite in Fe–Mn–Si shape memory alloys10.1016/j.actamat.2010.08.041 ↗
40. Laird C. The influence of metallurgical structure on the mechanisms of fatigue crack propagation. Ny:ASTM International; 196710.1520/STP47230S ↗
41. Additional evidence for the plastic blunting process of fatigue crack propagation10.1007/BF02676989 ↗