Tensile properties of metastable stainless steels

Rosen, A.; Jago, R. A.; Kjer, Torben

doi:10.1007/bf00550434

Cited by 65 publications

(32 citation statements)

References 3 publications

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“…It has been found that there is a certain temperature, characteristic of the steel composition, at which the maximum elongation is achieved. [5,6] In this condition, ␣Ј-martensite is formed only at high strains, and thus, it improves the ductility by preventing the onset of necking, [5,6,7] which is referred to as so-called transformation induced plasticity (TRIP) effect.…”

Section: Introductionmentioning

confidence: 99%

Effect of strain rate on the strain-induced γ → α′-martensite transformation and mechanical properties of austenitic stainless steels

Talonen¹,

Hänninen²,

Nenonen

et al. 2005

Metall Mater Trans A

456

286

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The effect of strain rate on strain-induced -martensite transformation and mechanical behavior of austenitic stainless steel grades EN 1.4318 (AISI 301LN) and EN 1.4301 (AISI 304) was studied at strain rates ranging between 3 ϫ 10 Ϫ4 and 200 s Ϫ1 . The most important effect of the strain rate was found to be the adiabatic heating that suppresses the strain-induced transformation. A correlation between the work-hardening rate and the rate of transformation was found. Therefore, the changes in the extent of the ␣Ј-martensite formation strongly affected the work-hardening rate and the ultimate tensile strength of the materials. Changes in the martensite formation and workhardening rate affected also the ductility of the studied steels. Furthermore, it was shown that the square root of the ␣Ј-martensite fraction is a linear function of flow stress. This indicates that the formation of ␣Ј-martensite affects the stress by influencing the dislocation density of the austenite phase. Olson-Cohen analysis of the martensite measurement results did not indicate any effect of strain rate on shear band formation, which was contrary to the transmission electron microscopy (TEM) examinations. The ␤ parameter decreased with increasing strain rate, which indicates a decrease in the chemical driving force of the transformation. g S a¿ g S a¿ g S a¿ g S a¿ g S a¿

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Section: Introductionmentioning

confidence: 99%

Effect of strain rate on the strain-induced γ → α′-martensite transformation and mechanical properties of austenitic stainless steels

Talonen¹,

Hänninen²,

Nenonen

et al. 2005

Metall Mater Trans A

456

286

View full text Add to dashboard Cite

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“…1 has a dashed segment of about 10% true strain corresponding to the decrease in load from ultimate strength to fracture in the engineering curve. This extension of the necking was earlier attributed to the amount of martensite 7,8 . Another point worth noticing in Fig.…”

Section: Martensitic Transformationmentioning

confidence: 58%

“…On the contrary Rosen et al 8 argued that it was not the total amount of martensite, but its distribution, which was important in governing the ductility of the steel. Fatigue crack propagation has also in the past been studied in austenitic stainless steels 10,11 .…”

Section: Introductionmentioning

confidence: 96%

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Fracture Modes of AISI Type 302 Stainless Steel Under Metastable Plastic Deformation

et al. 2017

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Martensitic transformation can be induced by plastic deformation in metastable iron-based alloys, such as stainless steels containing limited amounts of C, Ni and Cr. This transformation takes place at the temperature range from M s and M d , usually at relatively lower temperature values. The transformed martensite has been associated with maximum ultimate strength and relatively high ductility. In the present work, the tensile fracture characteristics of a metastable AISI type 302 stainless steel was investigated in the range of temperatures from -196°C to 25°C. Mechanical properties were compared to those of a stable AISI type 310 austenitic stainless steel. It was found that in 302 steel, its high degree of metastability and dilute dispersion of inclusions result in higher strength and complex modes of fracture, one of which consisting of martensite surrounding globular inclusions.

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“…In fact, in the case of uniaxial tension, and then Hecker (1982) demonstrated that the ductility appears to depend on both the extent of martensite formation and the strain at which martensite forms. According to Rosen et al (1972) and confirmed by Talyan et al (1998), the ductility in metastable austenitic stainless steels is dominated by the formation and distribution of martensite over the tensile specimen and not by the total amount of martensite. There are two types of martensite formed sequentially from the austenite γ (FCC) : martensite ε (HCP) then martensite α' (BCC) (Mangonon Jr andThomas, 1970;Solomon andSolomon, 2010;.…”

Section: Microstructural Analysismentioning

confidence: 99%