A new life extension method for high cycle fatigue using micro-martensitic transformation in an austenitic stainless steel

Myeong, T. H.; Yamabayashi, Y.; Shimojo, M.; Higo, Yakichi

doi:10.1016/s0142-1123(97)00060-1

Cited by 32 publications

(27 citation statements)

References 4 publications

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“…While in [25] the authors have found a slight decrease of m and C Paris constants after DCT, indicating a reduction in crack growth rate, the result has not been confirmed in [26] by the same authors. In the discussion about crack initiation life extension, the authors have suggested a dislocation-pinning mechanism in agreement with the TEM observation and with the diffractometric analysis performed in [27][28][29], which have revealed the presence of nanomartensitic particles in pre-strained austenitic stainless steels after an SCT performed with a few hours hold-time at 3 K above Ms (martensite start temperature).…”

Section: Ferrous Alloyssupporting

confidence: 66%

“…The cryogenic treatment does not seem to be effective on tensile properties of AISI 304 and 316 stainless steels [27][28][29].…”

Section: Tensile and Bending Strengthmentioning

confidence: 99%

“…Some studies about CT and fatigue have been conducted at the Precision and Intelligence Laboratory of the Tokyo Institute of Technology [27][28][29]. During these researches the authors have measured the Ms (martensite start temperature) of a stainless steel with the acoustic emission technique, then they have cooled the samples just 3 K above Ms and they have returned the samples to the room temperature.…”

Section: Fatigue Resistancementioning

confidence: 99%

“…During these researches the authors have measured the Ms (martensite start temperature) of a stainless steel with the acoustic emission technique, then they have cooled the samples just 3 K above Ms and they have returned the samples to the room temperature. In [27] the test has been conducted on an austenitic Fe-18Cr-8Ni stainless steel pre-strained by 2% in order to increase the dislocation density. The result, as reported in Fig.…”

Section: Fatigue Resistancementioning

confidence: 99%

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Deep Cryogenic Treatment: A Bibliographic Review

Baldissera¹,

Delprete²

2008

TOMEJ

197

101

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Abstract:The use of cryogenic treatment (CT) to improve mechanical properties of materials has been developed from the end of the Sixties. At the present time, the initial mistrust about CT has been cleared up and many papers about different materials reporting laboratory tests results, microstructural investigations and hypothesis on CT strengthening mechanisms have been published. The removal of retained austenite combined with fine dispersed -carbides precipitation have been widely observed and their effects on mechanical properties have been measured. In addition, some recent studies have pointed out a different mechanism for fatigue strengthening of stainless steels, which involves nano-martensite formation during the CT. The present paper summarizes the state of art about CT, focusing on methods, parameters, results and assumed microstructural mechanisms, in order to get a starting point for new researches to come.

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Section: Ferrous Alloyssupporting

confidence: 66%

“…The cryogenic treatment does not seem to be effective on tensile properties of AISI 304 and 316 stainless steels [27][28][29].…”

Section: Tensile and Bending Strengthmentioning

confidence: 99%

Section: Fatigue Resistancementioning

confidence: 99%

Section: Fatigue Resistancementioning

confidence: 99%

See 2 more Smart Citations

Deep Cryogenic Treatment: A Bibliographic Review

Baldissera¹,

Delprete²

2008

TOMEJ

197

101

View full text Add to dashboard Cite

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“…The influence of strain-induced martensite on high cycle fatigue (HCF) life is discussed in a contrary manner: on the one hand, additional microstructural barriers and additional volume are introduced by small martensite needles (cf. [10] ), which may block and (by means of transformation-induced crack closure [2,3] ) retard crack propagation. On the other hand, martensite formation can be considered as local fatigue damage promoting crack initiation and easy propagation along austenite-martensite interfaces.…”

mentioning

confidence: 99%

In Situ SEM Observation and Analysis of Martensitic Transformation During Short Fatigue Crack Propagation in Metastable Austenitic Steel

et al. 2010

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Fatigue life of structures made of metastable austenitic steels, e.g., in civil engineering or chemical industry, depends strongly on the phenomenon of strain-induced phase transformation from g austenite to a 0 martensite. Due to the higher strength and the higher specific volume of the martensite phase, pronounced cyclic hardening throughout the fatigue life [1] and transformation-induced crack closure during fatigue crack propagation [2,3] can be observed.Contrary to stable austenitic steels, the Ni concentration in the metastable materials is rather low (approximately 8 wt%), and hence, cooling should result in g austenite, d ferrite, and a 0 martensite, according to the Schaeffler diagram, [4] as shown in Figure 1.From a thermodynamic point of view, cooling to room temperature is not sufficient to cause spontaneous transformation. Only when mechanical strain contributes with DG mech to the energy level of the parent austenite phase, the critical Gibbs energy difference DG as driving force for martensite formation is reached. This is schematically shown in Figure 2. By means of the following phenomenologic equations (cf. [5] , the concentration of alloying elements to be inserted in wt%) the martensite start temperature M s and the temperature M d30 where 30% plastic strain results in 50% martensite formation can be calculated:M d30 ¼ 413 À 462ð%C þ %NÞ À 9; 2ð%SiÞ À 8; 1ð%MnÞ À 13; 7ð%CrÞ À 20ð%NiÞ À 18; 5ð%MoÞAccording to earlier work, [6,7] a 0 martensite nucleates at hcp e marteniste band intersections. The e martensite bands are caused by an accumulation of stacking faults in the {111} slip planes of the fcc austenite phase, i.e., plasticity occurring in the g austenite leads to the formation of shear bands which transforms to e martensite with the {0001} basal planes being parallel to the {111} slip planes of the parent austenite phase. [7] During monotonic tension the transformation into a 0 martensite follows a sigmoidal relationship, as it is described COMMUNICATION [**] Acknowledgements, The financial support by Deutsche Forschungsgemeinschaft and the material supply by Deutsche Edelstahlwerke Südwestfalen are gratefully acknowledged.High cycle fatigue (HCF) life of metastable austenitic steels is governed by the ability of the parent austenite phase to transform into a 0 martensite via metastable e martensite. The mechanism of this strain-induced transformation is closely related to the grain size, the crystallographic orientation distribution, as well as to amplitude, and cyclic accumulation of plastic strain. Aim of the present study is to identify and to quantitatively describe the basic principles of strain-induced martensite formation by means of in situ cyclic deformation experiments in a scanning electron microscope (SEM) in combination with electron back-scattered diffraction (EBSD) and numerical modeling using a boundary element approach. It was shown that during HCF loading martensite formation is inhomogeneous and not directly linked with crack initiation. Only when the fatigue crack pro...

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Enhancement of the mechanical properties of EN52CrMoV4 spring steel by deep cryogenic treatment

Özden

Anık

2020

Materialwissenschaft Werkst

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The effect of the deep cryogenic treatment on the micro-structure and mechanical properties (tensile strength, toughness, residual stress and fatigue strength) of the medium carbon spring steel, which is subjected to different heat treatment steps, is investigated. Deep cryogenic treatment causes spring steel to keep compressive residual stress more efficiently due to an increase in the density of the crystalline defects, retardation in the stress relief after the phase transformations and nano-cluster carbide formations. If deep cryogenic treatment is applied before the tempering then the homogeneously distributed fine carbides form after the tempering and the grains remain relatively fine. The microstructure with homogeneously distributed fine carbides and fine grains cause spring steels to have simultaneously enhanced tensile strength, ductility and fatigue strength. If deep cryogenic treatment is applied after the conventional heat treatment (quenching + tempering), however, the coarse carbides form in the micro-structure and the improvement in the mechanical properties of the spring steel is limited.

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A new life extension method for high cycle fatigue using micro-martensitic transformation in an austenitic stainless steel

Cited by 32 publications

References 4 publications

Deep Cryogenic Treatment: A Bibliographic Review

Deep Cryogenic Treatment: A Bibliographic Review

In Situ SEM Observation and Analysis of Martensitic Transformation During Short Fatigue Crack Propagation in Metastable Austenitic Steel

Enhancement of the mechanical properties of EN52CrMoV4 spring steel by deep cryogenic treatment

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