نتایج جستجو برای: induced martensite

تعداد نتایج: 981957  

Journal: :Materials Letters 2021

In the work reported here, mechanical properties of a newly developed Fe-Ni-Co-Mn-Ti-Si medium-entropy alloy with heterogeneous microstructure were investigated. High yield strength (~930 MPa), high ultimate tensile (~1100 and good ductility (~30%) achieved using hetero-deformation-induced strengthening plastic-incompatibility between mechanically induced-martensite austenitic matrix.

2014

Numerous experimental studies have shown that evolution of the martensite microstructure in shape memory alloys can lead to plastic deformation. This results in poor functional fatigue in many commercial applications, whereby strain incrementally advances with repeated thermal cycling under stress. This can also affect structural fatigue, whereby repeated cycling initiates and grows fatigue cra...

2006
R. Kainuma Y. Imano W. Ito H. Morito Y. Sutou K. Oikawa A. Fujita K. Ishida O. Kitakami T. Kanomata

Shape memory and magnetic properties of a Ni43Co7Mn39Sn11 Heusler polycrystalline alloy were investigated by differential scanning calorimetry, the sample extraction method, and the three-terminal capacitance method. A unique martensitic transformation from the ferromagnetic parent phase to the antiferromagneticlike martensite phase was detected and magnetic-field-induced “reverse” transition w...

2016
S. Kajiwara T. Kikuchi H. Pal T. Asano M. Kosuge M. Yuyama K. Inoue H. Wada

Effects of ultra high magnetic field of both pulse and steady types on martensitic transformation have been studied, using Fe-Ni-Mn, Fe-Ni-Mn-C alloys with the supplemental tests on Fe-Ni-C and Fe-NiCo-Ti alloys. It is found that the martensitic transformation is induced at room temperature not only athermally but also isothermally either by pulse magnetic field or by steady magnetic field for ...

2017
F. Nishimura N. Watanabe K. Tanaka

The uniaxial thermomechanical behavior of a polycrystalline Fe-9%Cr-5%Ni-14%Mn-6%Si (all wt.%) shape memory alloy is investigated for both tensile and compressive stress states. The martensite start stresses measured upon tension and compression loading of austenite depend linearly on temperature, thus forming straight lines in the stress-temperature regime. The lines belonging to tension and c...

Journal: :Journal of the Japan Institute of Metals and Materials 1960

2008
H.-S. Yang H. K. D. H. Bhadeshia

The possibility of producing bainite at low temperatures by suppressing transformation using substitutional solutes has been investigated, as an alternative to using large carbon concentrations to achieve the same purpose. It is found that although transformation temperatures can indeed be suppressed in this way, the difference between the bainite and martensite start temperatures diminishes. T...

2015
Suvi PAPULA Tapio SAUKKONEN Juho TALONEN Hannu HÄNNINEN

In metastable austenitic stainless steels, strain-induced martensitic transformation during plastic deformation enhances work hardening of the material, increasing its strength and in some cases also ductility.1,2) The presence of α’-martensite, however, may increase the susceptibility of these materials to hydrogen embrittlement phenomena, for example delayed cracking.3–6) Delayed cracking can...

2017
P. Scherrer S. Rubini C. Dimitropoulos F. Borsa

l13Cd NMR measurements in two Ag-Cd samples cycled between room temperature and temperatures below M, are presented. The growth curve of the martensite on cooling presents a discontinuity in the cycling temperature region. It is shown that the method of analysis of the NMR data recently developed by us [Phys.Rev.B 46, 10563 (1992)], allows to detect subtle memory effects and the absolute determ...

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