Influence of strain rate on mechanical properties of thin-sheet austenitic-martensitic TRIP-steel with low martensite content

For automotive industries, weight of an automobile can be reduced if TRIP steel which has excellent mechanical properties dominated by strain-induced martensitic transformation (SIMT) can be applied to shock absorption members. However, strain rate sensitivity of TRIP steels has not been fully understood because a relationship between a strain rate and an amount of martensite produced by SIMT is still unclear. In previous studies, volume resistivity and impedance have been measured to obtain information on the amount of produced martensite, however, these studies have not been succeeded to clarify the relationship. Here, by focusing a property that martensite shows ferromagnetism, it is attempted that impedance of TRIP steel is measured at various strain rates during the deformation by using prototype coil and circuits.

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Effect of surface layer removal on mechanical properties and form of static expansion curves of thin-sheet austenite-martensitic trip-steel

Deformation and Fracture of Materials ◽

10.31044/1814-4632-2017-12-16-20 ◽

2017 ◽

pp. 16-20

Author(s):

V.F. Terentyev ◽

◽

A.K. Slizov ◽

D.V. Prosvirnin ◽

A.A. Ashmarin ◽

...

Keyword(s):

Mechanical Properties ◽

Surface Layer ◽

Trip Steel ◽

Thin Sheet ◽

Layer Removal ◽

Effect Of Surface

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Effect of strain rate on mechanical properties and microstructure of TRIP steel

E3S Web of Conferences ◽

10.1051/e3sconf/202125202058 ◽

2021 ◽

Vol 252 ◽

pp. 02058

Author(s):

Libo Pan ◽

Wanjun Zhu ◽

Zhaojun Deng ◽

Zhijiang Zuo

Keyword(s):

Mechanical Properties ◽

Strain Rate ◽

Trip Steel ◽

Volume Fraction ◽

Aging Effect ◽

Tensile Tests ◽

Total Elongation ◽

Dynamic Strain ◽

Soaking Time ◽

The Difference

TRIP effect is one of the important features for TRIP steel. A Nb-Mo microalloyed TRIP steel was developed by employing two different soaking time during annealing, and tensile tests at three different strain rate for specimens after annealing were performed. The microstructures and the volume fraction of retained martensite were examined and analyzed. The result indicated that TRIP steel showed significantly different behaviour at different strain rates. The ultimate tensile strength and total elongation decreased with the strain rate increasing. The dynamic strain aging effect might occur at low strain rate. With shorter soaking time during annealing, microstructure with ultra-refined grain size could be achieved. Fracture surfaces were different at different strain rate. As strain rate increases, the fraction of retained austenite to martensite transformation at failure point decreases which leads to the difference of mechanical properties.

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Finite element and experimental investigation on the effects of temperature, strain and strain rate on microstructure and mechanical properties of FSSWed TRIP steel joints

Materials Research Express ◽

10.1088/2053-1591/aae8f3 ◽

2018 ◽

Vol 6 (1) ◽

pp. 016559 ◽

Cited By ~ 3

Author(s):

Ali Ebrahimpour ◽

Amir Mostafapour ◽

Kaveh Samadian

Keyword(s):

Mechanical Properties ◽

Experimental Investigation ◽

Finite Element ◽

Strain Rate ◽

Trip Steel ◽

Microstructure And Mechanical Properties ◽

Strain And Strain Rate ◽

Effects Of Temperature ◽

Steel Joints ◽

Temperature Strain

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An Evaluation on Strain Dependency and Strain Rate Sensitivity of Martensitic Transformation Generated in TRIP Steel by Measurement of Magnetic Permeability

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.626.432 ◽

2014 ◽

Vol 626 ◽

pp. 432-437

Author(s):

Yutaro Moriyama ◽

Daiki Inoshita ◽

Takeshi Iwamoto

Keyword(s):

Mechanical Properties ◽

Martensitic Transformation ◽

Strain Rate ◽

Strain Rate Sensitivity ◽

Magnetic Permeability ◽

Trip Steel ◽

Shock Absorber ◽

Rate Sensitivity ◽

Volume Resistivity ◽

Relative Magnetic Permeability

If TRIP steel with excellent mechanical properties dominated by strain induced martensitic transformation (SIMT) can be applied to a shock absorber in automobiles, it becomes possible to reduce a weight of the automobiles by decreasing the thickness of their components. In order to improve its reliability by clarification of the mechanical properties, it is necessary to evaluate continuous evolution of martensite during deformation in TRIP steel. In the previous studies, volume resistivity and impedance have been measured during deformation. However, these studies have not been succeeded for the evaluation of martensite with higher precision. Here, because of focusing on a characteristic which martensite indicates ferromagnetism, the evolution of martensite is evaluated by measuring relative magnetic permeability in TRIP steel during deformation at various strain rate.

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