An Experimental Investigation on Rate Sensitivity of Fracture-Mechanical Characteristics in 304 Austenitic Stainless Steel under Bending Deformation

Pham, Hang Thi; Iwamoto, Takeshi

doi:10.2355/isijinternational.isijint-2015-397

Cited by 14 publications

(7 citation statements)

References 18 publications

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“…12, it might be said that the material shows higher value of equivalent fracture strain at higher displacement rate in the investigated range of displacement rate. This tendency is consistent with the results on J-integral for determine fracture toughness as reported in Pham et al [20] for the same material. As a result, a correlation between equivalent fracture strain in the small punch test and fracture toughness of the material can be obtained in the small range of displacement rate in quasi-static condition.…”

Section: Resultssupporting

confidence: 93%

Application of small punch test to estimate mechanical behaviour of SUS304 austenitic stainless steel

Doan,

Pham

2024

Vietnam J. Mech.

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The small punch test with an application of a relatively small specimen has recently become a reliable material mechanics testing method. In this study, the small punch test is set up based on the conventional mechanical testing machine for SUS304 stainless steel to evaluate the mechanical properties of SUS304 steel at different displacement rates of the punch in quasi-static loading condition in the case of with and without heat treatment. Although heat treatment has an insignificant effect on the microstructure and hardness of the material, the mechanical properties of the material in the small punch test are greatly reduced after heat treatment. Both cases with and without heat treatment have a similar tendency for the rate - sensitivity of the applied force - displacement curve. A higher value of force is applied to obtain the same value of displacement at a low displacement rate in the stable plastic deformation zone. Meanwhile, the maximum value of applied force is higher at a higher displacement rate in the stage that initiation of crack might appear. In the examined range of displacement rate, a positive rate - sensitivity of displacement at the maximum force. Therefore, a correlation between equivalent fracture strain and fracture toughness of the material can be achieved.

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Section: Resultssupporting

confidence: 93%

Application of small punch test to estimate mechanical behaviour of SUS304 austenitic stainless steel

Doan,

Pham

2024

Vietnam J. Mech.

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“…The rate sensitivity of austenitic stainless steel is, thus, an important research object. Previous studies have described the rate sensitivity of mechanical characteristics in austenitic stainless steel; research works have also confirmed the mechanical properties of these materials per the strain‐induced martensitic transformation (SIMT) under inelastic deformation . In other words, SIMT is directly related to the reliability of the steel.…”

Section: Introductionmentioning

confidence: 94%

An Experimental Study on Strain Rate Sensitivity of Strain‐induced Martensitic Transformation in SUS304 by Real‐time Measurement of Relative Magnetic Permeability

Cao

Iwamoto

2017

steel research int.

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With excellent mechanical properties because of strain-induced martensitic transformation (SIMT), applications of austenitic stainless steels can be extended to a further broad range of engineering fields. In order to discover applications from a clarification of their mechanical properties, especially at higher deformation rate, it is important to evaluate an amount of martensite, which can control such excellent performances of the steels during deformation. However, until now, it is quite hard to find experimental studies for the evaluation during deformation at various strain rates. In the past, volume resistivity and impedance have been measured during deformation. However, these studies have not been successful to evaluate it with a higher precision. Instead of those, it is useful to measure directly relative magnetic permeability, which has a correlation with the amount of martensite, because of focusing on a ferromagnetic characteristic of martensite. In this study, at first, SUS304, which is a kind of austenitic stainless steels, is deformed plastically under tension at various strain rates. Then, it is attempted to evaluate the amount of martensite during deformation by measuring the relative magnetic permeability expressing ferromagnetism directly. Finally, the strain and strain rate sensitivity of SIMT in the steel is discussed by obtained results.[ Ã ] T. Iwamoto

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“…On the other hand, Pham and Iwamoto [2] conduct a small punch test by using tiny disk specimens made of SUS304 at various strain rate. In addition, Talonen et al [3] report that martensitic phase is suppressed at high strain rate by conducting tensile tests targeted on a smooth specimen of SUS304 in a wide range of strain rate.…”

Section: Introductionmentioning

confidence: 99%

An Evaluation on Fracture Toughness in SUS304 at High Strain Rate Considering Process Zone

Yoshida

Iwamoto

2021

EPJ Web Conf.

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Some research works report the relationships between transformation toughening and process zone. In SUS304, the reduction of transformation toughening at high strain rate is expected from the result of a small punch test. Currently, the process zone in SUS304 is fuzzily defined. Therefore, a consideration of damaging process is necessary in order to understand a fracture mechanism associated with transformation toughening and process zone. In this study, at first, tensile tests of pre-cracked sheet specimens made of SUS304 are conducted by the split Hopkinson pressure bar in order to understand the fracture mechanism phenomenologically at high deformation rate. During the test, a DC potential difference method is introduced to capture onset time of fracture.

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An Experimental Investigation on Rate Sensitivity of Fracture-Mechanical Characteristics in 304 Austenitic Stainless Steel under Bending Deformation

Cited by 14 publications

References 18 publications

Application of small punch test to estimate mechanical behaviour of SUS304 austenitic stainless steel

Application of small punch test to estimate mechanical behaviour of SUS304 austenitic stainless steel

An Experimental Study on Strain Rate Sensitivity of Strain‐induced Martensitic Transformation in SUS304 by Real‐time Measurement of Relative Magnetic Permeability

An Evaluation on Fracture Toughness in SUS304 at High Strain Rate Considering Process Zone

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