Phase transitions at the crack tip in titanium-modified type 316 stainless steel cathodically hydrogen charged

Manor-Minkovitz, E.; Eliezer, D.

doi:10.1007/bf02385401

Cited by 2 publications

(2 citation statements)

References 36 publications

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“…Austenitic stainless steels are divided into two types, metastable and stable from a viewpoint of the stability of austenitic phase 10 . Metastable types, such as type 304, can develop higher strength and hardness by a coldwork, because of the strain‐induced martensitic transformation 9 , 11–16 .…”

Section: Introductionmentioning

confidence: 99%

“…Austenitic stainless steels are divided into two types, metastable and stable from a viewpoint of the stability of austenitic phase. 10 Metastable types, such as type 304, can develop higher strength and hardness by a coldwork, because of the strain-induced martensitic transformation. 9,[11][12][13][14][15][16] On the other hand, stable type, such as type 304N2 and 316 in the present study, has more stable austenitic phase than type 304 according to the higher nickel equivalent.…”

Section: Introductionmentioning

confidence: 99%

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Some factors exerting an influence on the coaxing effect of austenitic stainless steels

Akita

Nakajima

Uematsu

et al. 2012

Fatigue Fract Eng Mat Struct

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The present paper describes some factors exerting an influence on the coaxing effect of austenitic stainless steels. Particularly, the influence of prestrain was investigated in detail. The materials used were austenitic stainless steels, type 304 and 316. Type 304N2 was also used to examine the properties of the stabilized austenitic phase in type 304. Two types of rotating bending fatigue tests, i.e. the conventional constant amplitude tests and stress‐incremental tests, were performed using the specimens subjected to the several tensile‐prestrain levels. Under the constant amplitude tests, the fatigue strengths of type 304 and 316 increased with increasing prestrain. Under the stress‐incremental tests, type 304 showed a remarkable coaxing effect, where the fatigue failure stress significantly increased regardless of the prestrain level. The coaxing effect in the unprestrained specimens was larger than those of the prestrained ones. Type 304N2 showed lower coaxing effect than type 304. In addition, the strain‐induced martensitic transformation did not occur because of the higher stability of austenitic phase in type 304N2. In type 316, the coaxing effect was dependent on the prestrain level, i.e. below 15% prestrain the coaxing effect became smaller with increasing prestrain, whereas above 25% prestrain the coaxing effect reappeared. Based on the tests results, it was considered that the coaxing effect in austenitic stainless steel was due to the mechanisms such as work hardening, strain ageing and strain‐induced martensitic transformation. The contribution of these mechanisms to the coaxing effect was different among type 304, 304N2 and 316.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Some factors exerting an influence on the coaxing effect of austenitic stainless steels

Akita

Nakajima

Uematsu

et al. 2012

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

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Zum Einfluß des Ni‐Gehaltes austenitischer Stähle auf den Mechanismus der Rißausbreitung bei der chloridinduzierten transkristallinen Spannungsrißkorrosion

Engelmann

Mummert

1993

Materials & Corrosion

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Auf der Grundlage mikrostruktureller Untersuchungen im unmittelbaren Rilhpitzenbereich korrosiver Risse mittels TEM wird der EinfluB des Ni-Gehaltes austcnitischer Stahle auf den Mechanismus der RiRausbreitung bei der chloridinduzierten transkristallinen SpannungsriBkorrosion im Temperaturbereich von 150°C bis250"C diskutiert. Die an den Werkstoffen Nr. 1.4541 und Nr. 1.4558 gewonnenen Ergebnisse zeigen, daB der beim Korrosionsprozea entstehende Wasserstoff den ProzeR der RiRausbreitung entscheidend beeinfluBt. Der EinfluR des Wasserstoffs ist dabei von der Hohe der Stapelfehlerenergie und somit vom Ni-Gehalt der austenitischen Stahle abhangig. Durch den Ni-Gehalt wird aber auch die Diffusionsgeschwindigkeit des Wasserstoffs im Austenitgitter und damit die Moglichkeit der Ausbildung kritischer Wasserstoffkonzentrationen im unmittelbaren RiBspitzenbereich bestimmt. Mit Hilfe dieser Ergebnisse kann die aus der Literatur bekannte, mit wachsendem Ni-Gehalt abnehmende Anfalligkeit gegen transkristalline SpannungsriBkorrosion besser verstanden werden.The influence of Ni-content of austenitic stainless steels on the SCC crack growth mechanism in chloride solutions at elevated temperatures is discussed, based on crack tip characterization of corrosive cracks by means of Transmission Electron Microscopy. Samples of stainless steels AISI 321 and INCOLOY 800 were analyzed. The results indicate a cracking process highly influenced by hydrogen, which is produced by the cathodic reaction of the corrosion process inside the crack. The effect of corrosive hydrogen on the cracking process depends on the stacking fault energy and thus on the Ni-content of the steel. There is also an influence of Ni-content on the diffusion coefficients of hydrogen in the austenitic lattic, determining the formation of hydrogen up to a critical concentration in the crack tip region. Thus, the results give an opportunity for a better understanding of the decreasing transgranular SCC susceptibility, which is observed at stainless steels with increasing Ni-content.

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Phase transitions at the crack tip in titanium-modified type 316 stainless steel cathodically hydrogen charged

Cited by 2 publications

References 36 publications

Some factors exerting an influence on the coaxing effect of austenitic stainless steels

Some factors exerting an influence on the coaxing effect of austenitic stainless steels

Zum Einfluß des Ni‐Gehaltes austenitischer Stähle auf den Mechanismus der Rißausbreitung bei der chloridinduzierten transkristallinen Spannungsrißkorrosion

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