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MAGNETIC FREEZING BY USING THE TRANSFORMATION OF MATERIAL

利用材料转变进行磁冷冻

基本信息

批准号：
07650507
负责人：
ISHIGAKI Hiroyuki
金额：
$ 1.34万
依托单位：
HIMEJI INSTITUTE OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

项目摘要

A new magnetic recording, which uses the phase-transformation of austenitic stainless steel, is proposed. The transformation from austenito to martensite occurs as a result of tribological stress. Martensite is ferromagnetic while austenite is not. memorizing phenomena of magnetic field in stainless steel were observed. After a uniform tensile stress generated the phase-transformation of a stainless steel thin plate in a magnetic field, the magnetic force distribution on the steel surface was measured. The distribution was similar to that of the magnetic field that was induced by the exciting coil. This result means that the information about the external magnetic field distribution was frozen in the tension test specimen. The freezing characteristics obtained by conducting the study were as follws ;1)There is a good correlation between the stress applied by stretching a stainless steel plate and the magnitude of the magnitic force, which is stored in the plate. And the relationship shows good linearity.2)As the amount of plastic deformation increases, both magnetic force and distortion of the frozen field increase. This means that there exists an optimal condition for the freezing. These conditions depend on materials. The optimal stress for SUS 304 is 410 MPa.3)The frozen magnetic field was contained in the stainless steel plate for more than 2 month. the magnetic field is quite stable for the external magnetic field wnen the direction coincides with that of the frozen magnetic field.4)The frozen magnetic field is erased by the irradiation of CO2 laser5)The irradiation of CO2 laser has a capability to be used as a trigger for the freezing of magnetic field.

提出了一种利用奥氏体不锈钢相变的新型磁记录方法。由于摩擦应力的作用，发生了从马氏体到马氏体的转变。马氏体是铁磁性的，而奥氏体不是。观察到磁场在不锈钢中的记忆现象。不锈钢薄板在磁场作用下产生均匀拉应力相变后，测量了钢板表面的磁力分布。其分布与激励线圈感应的磁场分布相似。这一结果意味着关于外部磁场分布的信息被冻结在拉伸试样中。通过研究得到的冻结特性如下：1）拉伸不锈钢板所施加的应力与板中储存的磁力大小之间有很好的相关性。随着塑性变形量的增加，磁场力和冻结场的变形量都增加。这意味着存在最佳的冷冻条件。这些条件取决于材料。SUS 304的最佳应力为410 MPa。3）在不锈钢板中保持冻结磁场2个月以上。当外加磁场的方向与冻结磁场的方向一致时，磁场是相当稳定的。4）冻结磁场被CO_2激光的照射所消除。5）CO_2激光的照射具有作为磁场冻结的触发器的能力。