Effect of high magnetic field on phase transformation temperature in Fe-C alloys

被引：45

作者：

Hao, XJ ^{[1
]}

Ohtsuka, H ^{[1
]}

机构：

[1] Natl Inst Mat Sci, Tsukuba Magnet Lab, Tsukuba, Ibaraki 3050003, Japan

来源：

MATERIALS TRANSACTIONS | 2004年 / 45卷 / 08期

关键词：

ferrite transformation; pearlite transformation; transformation temperature; iron-carbon alloys; high magnetic field; molecular field theory;

D O I：

10.2320/matertrans.45.2622

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Magnetic field can affect the transformation temperature and microstructure if a transformed phase has different susceptibility with parent phase. Fe-C alloy is an ideal system to show the magnetic field effect since in this system, austenite (fee structure) is a paramagnetic phase and ferrite (bee structure) is a ferromagnetic phase below 770degreesC. In this paper, phase transformation temperature in Fe-C alloys in a magnetic field was measured from cooling curve. It was found that the transformation temperature for pure Fe from austenite to ferrite has a linear relationship with magnetic field strength, increasing about 0.8degreesC per unit of magnetic field of 1 T. For eutectoid transformation in Fe-0.8C alloy, similar relationship exists, the transformation temperature increases about 1.5degreesC per unit of magnetic field of 1 T. Experimental results do not agree well with that calculated by molecular field theory. An elongated and aligned microstructure by transformation in a high magnetic field was found in an Fe-0.4C alloy, but was not found in pure Fe and Fe-0.8C alloy.

引用

页码：2622 / 2625

页数：4

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