In situ observation of martensitic transformation in air-hardened 6Cr-1Mo-1C steel through hot-stage microscopy

1988 ◽  
Vol 7 (5) ◽  
pp. 435-436
Author(s):  
Amitava Ray ◽  
Santanu Kr. Ray ◽  
R. N. Mukherjee ◽  
S. R. Mediratta
Keyword(s):  
Martensitic Transformation ◽  
In Situ Observation ◽  
Hot Stage Microscopy

In situ observation of the martensitic transformation in (Mg,Y)-PSZ

1986 ◽  
Vol 44 ◽  
pp. 500-501
Author(s):  
R-R. Lee
Keyword(s):  
Martensitic Transformation ◽  
High Strength ◽  
Nucleation And Growth ◽  
In Situ Observation ◽  
Considerable Potential ◽  
Transmission Electron ◽  
Structural Applications ◽  
Applied Stresses ◽  
Kinetics Of

Partially-stabilized ZrO2 (PSZ) ceramics have considerable potential for advanced structural applications because of their high strength and toughness. These properties derive from small tetragonal ZrO2 (t-ZrO2) precipitates in a cubic (c) ZrO2 matrix, which transform martensitically to monoclinic (m) symmetry under applied stresses. The kinetics of the martensitic transformation is believed to be nucleation controlled and the nucleation is always stress induced. In situ observation of the martensitic transformation using transmission electron microscopy provides considerable information about the nucleation and growth aspects of the transformation.

scholarly journals Novel −75°C SEM cooling stage: application for martensitic transformation in steel

Microscopy ◽  
2020 ◽  
Author(s):  
Kaneaki Tsuzazki ◽  
Motomichi Koyama ◽  
Ryosuke Sasaki ◽  
Keiichiro Nakafuji ◽  
Kazushi Oie ◽  
...  
Keyword(s):  
Martensitic Transformation ◽  
Electron Backscatter Diffraction ◽  
Dislocation Slip ◽  
In Situ Observation ◽  
Contrast Imaging ◽  
Cooling Stage ◽  
Electron Channelling ◽  
Electron Backscatter ◽  
Backscatter Diffraction

Abstract Microstructural changes during the martensitic transformation from face-centred cubic (FCC) to body-centred cubic (BCC) in an Fe-31Ni alloy were observed by scanning electron microscopy (SEM) with a newly developed Peltier stage available at temperatures to  −75°C. Electron channelling contrast imaging (ECCI) was utilized for the in situ observation during cooling. Electron backscatter diffraction analysis at ambient temperature (20°C) after the transformation was performed for the crystallographic characterization. A uniform dislocation slip in the FCC matrix associated with the transformation was detected at −57°C. Gradual growth of a BCC martensite was recognized upon cooling from −57°C to −63°C.

In situ TEM study of irradiation-induced transformation in TiNi shape memory alloys

2003 ◽  
Vol 792 ◽  
Author(s):  
X. T. Zu ◽  
F.R. Wan ◽  
S. Zhu ◽  
L. M. Wang
Keyword(s):  
Phase Transformation ◽  
Martensitic Transformation ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Electron Irradiation ◽  
Room Temperature ◽  
Critical Voltage ◽  
In Situ Tem ◽  
In Situ Observation

ABSTRACTTiNi shape memory alloy (SMA) has potential applications for nuclear reactors and its phase stability under irradiation is becoming an important topic. Some irradiation-induced diffusion-dependent phase transformations, such as amorphization, have been reported before. In the present work, the behavior of diffusion-independent phase transformation in TiNi SMA was studied by electron irradiation at room temperature. The effect of irradiation on the martensitic transformation of TiNi shape memory alloys was studied by Transmission Electron Microscopy (TEM) with in-situ observation and differential scanning calorimeter (DSC). The results of TEM and DSC measurements show that the microstructure of samples is R phase at room temperature. Electron irradiations were carried out using several different TEM with accelerating voltage of 200 kV, 300 kV, 400 kV and 1000 kV. Also the accelerating voltage in the same TEM was changed to investigate the critical voltage for the effect of irradiation on phase transformation. It was found that a phase transformation occurred under electron irradiation above 320 kV, but never appeared at 300 kV or lower accelerating voltage. Such phase transformation took place in a few seconds of irradiation and was independent of atom diffusion. The mechanism of Electron-irradiation-induced the martensitic transformation due to displacements of atoms from their lattice sites produced by the accelerated electrons.

In situ observation of stress-induced martensitic transformation and plastic deformation in TiNi alloy

1997 ◽  
Vol 238 (2) ◽  
pp. 303-308 ◽  
Author(s):  
Xiaoping Jiang ◽  
Moritaka Hida ◽  
Yoshito Takemoto ◽  
Akira Sakakibara ◽  
Hidehiro Yasuda ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Martensitic Transformation ◽  
Tini Alloy ◽  
In Situ Observation

In-situ observation of martensitic transformation in Cu-Al-Mn cryogenic shape memory alloy

2017 ◽  
Vol 125 ◽  
pp. 603-607 ◽  
Author(s):  
Yu Lei ◽  
Xing Qin ◽  
Farong Wan ◽  
Pingping Liu ◽  
Liubiao Chen ◽  
...  
Keyword(s):  
Martensitic Transformation ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
In Situ Observation

In Situ Analysis of Effects of Transformation Strain on the Austenite Phase during Martenistic Transformation of Cr-Ni Steel

2011 ◽  
Vol 172-174 ◽  
pp. 1255-1260
Author(s):  
Hidenori Terasaki ◽  
Zhang Shouyuan ◽  
Yu Ichi Komizo
Keyword(s):  
Martensitic Transformation ◽  
Reciprocal Lattice ◽  
Transformation Strain ◽  
Observation System ◽  
In Situ Observation ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
X Ray ◽  
Lattice Space

A hybrid in-situ observation system has been developed to study the phase transformation behaviour simultaneously in both real and reciprocal lattice space. This paper presents the development of the observation system. Furthermore, as an example of the application of our developed system, martensitic transformation of Cr–Ni steel along a designed thermal cycle was in-situ tracked with the developed system. As a result of analysing the time-resolved X-ray diffraction data for the observed target, our system could directly detect the effect of transformation strain on austenite during martensitic transformation.

D-9 in Situ Observation of the Martensitic Transformation of Individual Grains Using a High-Energy X-ray Microbeam

2007 ◽  
Vol 22 (2) ◽  
pp. 180-180
Author(s):  
E. Jimenez-Melero ◽  
N. H. van Dijk ◽  
L. Zhao ◽  
J. Sietsma ◽  
S. E. Offerman ◽  
...  
Keyword(s):  
Martensitic Transformation ◽  
High Energy ◽  
In Situ Observation ◽  
X Ray ◽  
Individual Grains
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