Effects of Magnetic Field and Prior Austenite Grain Size on the Structure Formed by Reverse Transformation from Lath Martensite to Austenite in an Fe-0.4C Alloy

Abstract

Effects of magnetic field strength and prior austenite grain size on the microstructure formed by the reverse transformation from lath martensite to austenite have been investigated in Fe-0.4C alloy. The degree of elongation of reverse-transformed austenite increases with increasing applied magnetic field, which is a similar result with that for austenite to ferrite transformation. However, well-elongated austenite is formed not only in small prior austenite grains but also in relatively large prior austenite grains, which is different from the case of austenite to ferrite transformation.

Effect of High Magnetic Field on Phase Transformation Temperature in Fe-C Alloys

“…With a maximum magnetic field of 10 T, the transformation temperature is about 914.9 C, which is 8. 7 C higher than that without magnetic field. The increased temperature (ÁT ¼ TðHÞ À Tð0Þ), the transformation temperature difference between with (TðHÞ) and without (Tð0Þ) a magnetic field (H) was plotted against magnetic field strength in Fig.…”

Effect of high magnetic field on alloy carbide precipitation in an Fe–C–Mo alloy

“…In recent years, the effects of strong magnetic fields on various phase transformations in steels, including martensite [15,16], bainite [17,18], ferrite [19,20] and pearlite [21] transformations have attracted much research interest. It is usually considered that strong magnetic field has a significant influence on ferromagnetic materials.…”

Structural control of Fe-based alloys through diffusional solid/solid phase transformations in a high magnetic field

“…Chiba et al [58] reported that a Co-Ni-based superalloy aged in a magnetic field exhibits higher strain-age hardening. Ohtsuka et al [59] investigated the transformed structure in a reverse transformation from lath martensite to austenite in a magnetic field and observed an elongated and aligned structure. Watanabe et al [60] spot-welded stainless steel in a magnetic field and observed the structure of the heat-affected zone (HAZ) and found that the area of the HAZ increases with increasing magnetic field.…”