Inverse effect of strain rate on mechanical behavior and phase transformation of superaustenitic stainless steel

Wu, Chi-Chang; Wang, Shing-Hoa; Chen, Chih-Yuan; Yang, Jer−Ren; Chiu, Po-Kai; Fang, Jason

doi:10.1016/j.scriptamat.2006.08.064

Cited by 37 publications

(11 citation statements)

References 18 publications

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“…Microstructural examination of the as-received superaustenitic stainless steel revealed tangled dislocations along the two primary intersected slip traces. The total elongations of these UNS S31254 superaustenitic stainless steels are conspicuously promoted upon increasing the strain rate; this trend of the ductility versus strain rate violates the normal condition that the elongation reduces as the strain rate increases [10].…”

Section: Resultsmentioning

confidence: 87%

Cyclic deformation and phase transformation of 6Mo superaustenitic stainless steel

Wang

Chen

et al. 2007

Met. Mater. Int.

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A fatigue behavior analysis was performed on superaustenitic stainless steel UNS S31254 (Avesta Sheffield 254 SMO), which contains about 6 wt.% molybdenum, to examine the cyclic hardening/softening trend, hysteresis loops, the degree of hardening, and fatigue life during cyclic straining in the total strain amplitude range from 0.2 to 1.5 %. Independent of strain rate, hardening occurs first, followed by softening. The degree of hardening is dependent on the magnitude of strain amplitude. The cyclic stress-strain curve shows material softening. The lower slope of the degree of hardening versus the strain amplitude curve at a high strain rate is attributed to the fast development of dislocation structures and quick saturation. The H martensite formation, either in band or sheath form, depending on the strain rate, leads to secondary hardening at the high strain amplitude of 1.5 %.

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Section: Resultsmentioning

confidence: 87%

Cyclic deformation and phase transformation of 6Mo superaustenitic stainless steel

Wang

Chen

et al. 2007

Met. Mater. Int.

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“…Present results are in agreement with early investigations focused on the tensile deformation of metastable austenitic alloys, which established the alloy's softening by introducing of e-martensite. [29][30][31] Thus, we conclude that the cyclic softening, improved plasticity, and sample temperature decrease in the range of 40 to 400 cycles ( Figure 4) are associated with the relaxation and accommodation of plastic deformation through the simultaneous development of PLBs, increase in dislocation density in PLBs, and transformation of PLBs into e-martensite.…”

Section: B Microstructure Evolution Of the Fe-30mn-4si-2al Alloymentioning

confidence: 99%

Microstructure Evolution Associated with a Superior Low-Cycle Fatigue Resistance of the Fe-30Mn-4Si-2Al Alloy

Nikulin

Sawaguchi

Ogawa

et al. 2015

Metall Mater Trans A

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ILYA NIKULIN, TAKAHIRO SAWAGUCHI, KAZUYUKI OGAWA, and KANEAKI TSUZAKI The microstructure evolution responsible for the superior low-cycle fatigue (LCF) resistance (N f > 8000 cycles at a total strain range of 2 pct) was studied in the Fe-30Mn-4Si-2Al alloy susceptible to strain-induced martensitic transformation. To investigate the microstructure effect on the LCF behaviors of the alloy, a series of interrupted fatigue tests at total strain range of 2 pct were carried out. A characteristic softening stage followed by the secondary hardening was observed during cyclic loading of the studied alloy. This softening is associated with the strain localization caused by persistent Lu¨ders bands formation and the transformation of Lu¨ders bands into strain-induced e-martensite is found to have a key role in the delayed fatigue fracture of the alloy being studied. Therefore, the continuous transformation process involving Lu¨ders bands and e-martensite formation associated with intermediate stacking fault energy (SFE) (c SF of 14 mJ/m 2 ) is necessary to prevent the rearrangement of dislocations into walls/ channels and substructures inherent to high-SFE (c SF higher 20 mJ/m 2 ) alloys capable to accelerated fatigue damage. However, sluggish martensite transformation kinetics is necessary to delay the formation of the e-martensite associated with the development and propagation of fatigue crack in alloys with very low SFE.

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“…Higher strain rates create adiabatic conditions, in which the heat of plastic deformation is not dissipated fast enough. The corresponding specimen temperature rise can be estimated by computing the mechanical energy transferred to the specimen (i.e., the area under the stress-strain curve) and considering that a certain percentage of it (in general 90-95%) is converted to thermal energy available to heat the specimen, e.g., [202,203]. This model was validated experimentally, for instance on 304 steel, where at 0.125 s -1 temperature increased from 24°C to 83°C by test end [204].…”

Section: Effect Of Strain Ratementioning

confidence: 99%

Tailoring plasticity of austenitic stainless steels for nuclear applications: Review of mechanisms controlling plasticity of austenitic steels below 400 °C

Bellefon

Duysen

2016

Journal of Nuclear Materials

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AISI 304 and 316 austenitic stainless steels were invented in the early 1900s and are still trusted by materials and mechanical engineers in numerous sectors because of their good combination of strength, ductility, and corrosion resistance, and thanks to decades of experience and data. This article is part of an effort focusing on tailoring the plasticity of both types of steels to nuclear applications. It provides a synthetic and comprehensive review of the plasticity mechanisms in austenitic steels during tensile tests below 400°C. In particular, formation of twins, extended stacking faults, and martensite, as well as irradiation effects and grain rotation are discussed in details.

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Inverse effect of strain rate on mechanical behavior and phase transformation of superaustenitic stainless steel

Cited by 37 publications

References 18 publications

Cyclic deformation and phase transformation of 6Mo superaustenitic stainless steel

Cyclic deformation and phase transformation of 6Mo superaustenitic stainless steel

Microstructure Evolution Associated with a Superior Low-Cycle Fatigue Resistance of the Fe-30Mn-4Si-2Al Alloy

Tailoring plasticity of austenitic stainless steels for nuclear applications: Review of mechanisms controlling plasticity of austenitic steels below 400 °C

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