scholarly journals Magnetization of α′ iron nitride produced through the fcc→bct martensitic transformation in high magnetic field

2006 ◽  
Vol 100 (3) ◽  
pp. 033906 ◽  
Author(s):  
T. Koyano ◽  
T. Nomiyama ◽  
N. Kanoh ◽  
H. Numata ◽  
T. Ohba ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Martensitic Transformation ◽  
High Magnetic Field ◽  
Iron Nitride

High magnetic field effect in martensitic transformation

1989 ◽  
Vol 155 (1-3) ◽  
pp. 207-210 ◽  
Author(s):  
K. Kindo ◽  
K. Hazumi ◽  
T. Kakeshita ◽  
K. Shimizu ◽  
H. Hori ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Martensitic Transformation ◽  
High Magnetic Field ◽  
Field Effect ◽  
Magnetic Field Effect

Control of iron nitride formation by a high magnetic field

2010 ◽  
Vol 25 (11) ◽  
pp. 2082-2085 ◽  
Author(s):  
W.P. Tong ◽  
H. Zhang ◽  
J. Sun ◽  
L. Zuo ◽  
J.C. He ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Magnetic Field ◽  
Nitriding Process ◽  
Iron Nitride ◽  
New Approach ◽  
Nitriding Reaction ◽  
Nitride Formation ◽  
Nitrogen Potential

The influence of high magnetic field on nitriding behavior was investigated in a mixture of NH3 and H2. It was found that high magnetic field could shift the equilibrium of nitriding reaction; this proved that the critical nitrogen potential to form γ′-Fe4N and ε-Fe3N phase was evidently enhanced compared with conventional nitriding. This research provides a new approach for a selective nitriding process.

scholarly journals Effects of High Magnetic Field and Tensile Stress on Martensitic Transformation Behavior and Microstructure at 4.2 K in Fe–Ni–C Alloys

1996 ◽  
Vol 37 (5) ◽  
pp. 1044-1049 ◽  
Author(s):  
Hideyuki Ohtsuka ◽  
Kotobu Nagai ◽  
Setsuo Kajiwara ◽  
Hitoshi Kitaguchi ◽  
Mitsuru Uehara
Keyword(s):  
Magnetic Field ◽  
Martensitic Transformation ◽  
Tensile Stress ◽  
High Magnetic Field ◽  
Transformation Behavior

Effects of High Magnetic Field and Tensile Stress on Martensitic Transformation Behavior and Microstructure At 4 K in Fe-Ni-C Alloys

1995 ◽  
Vol 398 ◽  
Author(s):  
H. Ohtsuka ◽  
K. Nagai ◽  
S. Kajiwara ◽  
H. Kitaguchi ◽  
M. Uehara
Keyword(s):  
Magnetic Field ◽  
Martensitic Transformation ◽  
Tensile Stress ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
High Magnetic Field ◽  
Constant Magnetic Field ◽  
Critical Magnetic Field ◽  
Transformation Behavior ◽  
The Magnetic Field

ABSTRACTEffects of high magnetic field and tensile stress on martensitic transformation behavior and microstructure at 4 K have been studied in Fe-31Ni-0.4C and Fe-27Ni-0.8C shape memory alloys. It was found that the critical magnetic field to induce martensitic transformation is between 7.5 T and 10 T. In the case of Fe-27Ni-0.8C, martensitic transformation is stress-induced at lower level of stress in magnetic field than in the case when no magnetic Field is applied. The amount of martensite formed by increasing the magnetic field under constant stress is larger than that formed by increasing the stress in the constant magnetic field.

Magnetic Field and Annealing Influence on the Martensitic Transition in Ni45.8Mn42.6In11.6 Shape Memory Alloy Ribbons

2012 ◽  
Vol 190 ◽  
pp. 307-310 ◽  
Author(s):  
Lorena González ◽  
J. García ◽  
M. Nazmunnahar ◽  
W.O. Rosa ◽  
L. Escoda ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Martensitic Transformation ◽  
Low Temperature ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
High Magnetic Field ◽  
Heusler Alloy ◽  
Vacuum Annealing ◽  
Martensitic Transition ◽  
Two Peaks

We report the effect of shorttime vacuum annealing, during 10 minutes at 923 K, 973 K, 1023 K and 1073 K, on magnetostructural properties of as-quenched ribbons of Ni45.5Mn43In11.5 Heusler alloy. The martensitic transformation is strongly sensitive to annealing treatments. The martensitic phase starting temperature is significantly shifted from 239 K towards higher temperatures around 370 K. It suffers a break down in two peaks when a field equal or higher than 500 Oe is applied to the as-quenched sample. This effect is not detected in the transformation of annealed ribbons but its signature can be observed at low temperature. Moreover, under high magnetic field up to 30 kOe temperatures associated with both martensitic and reverse transitions do not change for annealed samples, meanwhile the magnetization difference between austenite and martensite increases with the field. Nevertheless, it almost remains unchanged in the as-quenched ribbon.

Phase Transformation in Fe-Based Alloys in High Magnetic Fields

2005 ◽  
Vol 475-479 ◽  
pp. 301-304 ◽  
Author(s):  
X.J. Hao ◽  
H. Ohtsuka
Keyword(s):  
Magnetic Field ◽  
Phase Transformation ◽  
Martensitic Transformation ◽  
Magnetic Fields ◽  
Maraging Steel ◽  
High Magnetic Field ◽  
Transformation Temperature ◽  
High Magnetic Fields ◽  
Martensitic Transformation Temperature ◽  
Pearlitic Transformation

The effects of a high magnetic field on phase transformation behaviors and microstructures in Fe-based alloys have been extensively studied. It was found that a magnetic field accelerates ferritic and martensitic transformation, changes the morphology of the transformed microstructures and increases the A3 and A1 temperature. In a magnetic field of 10 Tesla, the A1 temperature increases by about 15°C for Fe-0.8C, the A3 temperature for pure Fe increases by about 8°C and the martensitic transformation temperature Ms in 18Ni maraging steel increases by 20°C. Ferrite grains are elongated and aligned along the direction of magnetic field in Fe-0.4C and Fe-0.6C alloys by ferritic transformation, but elongation was not found in pure Fe, Fe-0.05C alloy and Fe-1.5Mn-0.11C-0.1V alloy. Aligned structure was not found either by pearlitic transformation in Fe-0.8C alloy or by cementite precipitation from martensite.

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