Tensile Stress-Induced Structural Changes Associated with Martensite Transformations in Fe-Mn-Si Based Shape Memory Alloys

Mihai Mocanu; Elena Mihalache; Radu-Ioachim Comăneci; Bogdan Pricop; Burak Özkal; Leandru Gheorghe Bujoreanu

doi:10.4028/www.scientific.net/MSF.907.25

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HomeMaterials Science ForumMaterials Science Forum Vol. 907Tensile Stress-Induced Structural Changes...

Tensile Stress-Induced Structural Changes Associated with Martensite Transformations in Fe-Mn-Si Based Shape Memory Alloys

Abstract:

Tensile specimens, with the chemical composition Fe-28Mn-6Si-5Cr (mass. %), were obtained by ingot metallurgy, hot rolling, solution treatment (1100°C/ 5 min/ water) and spark erosion cutting. Tensile tests were performed to failure and to prescribed strains, by loading-unloading. Ultimate strain and strength increased up to 80.8 % and 1033 MPa, respectively, with decreasing the cross section of specimens’ gauge down to 2 mm². The specimens were pre-strained by static tensile loading-unloading tests, to permanent strains as high as 60 %. This procedure aimed to stress-induce martensite, which was further analyzed, on the gauges of pre-strained specimens, by optical and scanning electron microscopy (SEM) as well as X-ray diffraction (XRD). Thermally induced reversion to austenite, of stress-induced martensite, was emphasized, during heating, by differential scanning calorimetry (DSC).

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Periodical:

Materials Science Forum (Volume 907)

Pages:

25-30

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.907.25

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Online since:

September 2017

Authors:

Mihai Mocanu, Elena Mihalache*, Radu-Ioachim Comăneci, Bogdan Pricop, Burak Özkal, Leandru Gheorghe Bujoreanu

Keywords:

Martensite, Microstructure, Shape Memory Alloys, Tensile Tests, X-Ray Diffraction (XRD)

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