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Development and Application of the simultanious electron, X-ray and gamma-ray Mossbauer Detector

电子、X射线、伽马射线同时穆斯堡尔探测器的研制与应用

基本信息

批准号：
05555184
负责人：
NASU Saburo
金额：
$ 3.58万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

项目摘要

Backscattering Fe Mossbauer detector has been developed for the use in in-situ non-destructive testing of the large scale component like steel building wall, ships and so on. This detector can make possible to count the internal conversion electrons, backscattered X-ray and gamma-ray, simultaniously and measure the so called backscattering Mossbauer spectrum which can indicate the change in microscopic structure of steels and materials containing iron. Using this detector, the microstructural change in duplex-stainless-steel has been investigated by the bacscattering Mssbauer spectra obtained by the conversion electron, X-ray and gamma-ray. Commercial duplex-stainless-steel has usually been manufactured by a continuous casting technique and consists of a paramagnetic austenite and a ferromagnetic ferrite phase. ^<57>Fe Mossbauer spectra obtained from the duplex-stainless-steel consist of two components. One is a predominant component of the single resonance line rising from a paramagnetic austenite and the other is a minor component of a magnetically split sextet rising from ferromagnetic ferrite. Paramgentic austenite has a face-centered cubic (fcc) structure and a quite stable for heat treatments by annealing at elevated temperatures, but ferromagnetic ferrite has a body-centered cubic (bcc) structure and shows a phase decomposition by annealing at appropriate temperatures. Present Mossbauer study shows clearly that a phase decomposition occurred in ferrite of duplex-stainless steel by annealing at rather low temperature like 723 K.^<57>Fe Mossbauer spectra from ferrite show a change in magnitude of the averaged hyperfine magnetic fields suggesting a change in Cr concentration in ferrite by annealing.

研制了用于钢结构墙体、船舶等大型构件原位无损检测的背散射Fe穆斯堡尔谱探测器，该探测器能准确地计数内转换电子、背散射X射线和γ射线，并能测量反映钢和含铁材料微观结构变化的背散射穆斯堡尔谱。利用该探测器，用转换电子、X射线和γ射线的背散射穆斯堡尔谱研究了不锈钢的显微组织变化。商业的奥氏体不锈钢通常通过连续铸造技术制造，并且由顺磁性奥氏体和铁磁性铁素体相组成。不锈<57>钢样品的穆斯堡尔谱由两部分组成。一个是从顺磁性奥氏体上升的单共振线的主要成分，另一个是从铁磁性铁氧体上升的磁分裂六重态的次要成分。仲晶奥氏体具有面心立方（fcc）结构，并且对于通过在高温下退火的热处理是相当稳定的，但是铁磁铁素体具有体心立方（bcc）结构，并且通过在适当温度下退火显示相分解。穆斯堡尔谱研究清楚地表明，在723K这样的较低温度下退火，铁素体发生了相分解。<57>从铁氧体的Fe穆斯堡尔谱显示的平均超精细磁场的大小的变化，这表明在铁素体中的Cr浓度的变化，通过退火。