Model of Magnetic Barkhausen Noise for Characterization of Steel Materials

本科学研究的目标是开发便携式表面磁性巴克豪森噪声（MBN）能力，用于铁磁性钢性能的无损表征。目标包括综合测量残余应力、塑性变形程度、晶粒尺寸、碳含量、晶体织构、磁各向异性，以及在电工钢的情况下，铁芯损耗。这项工作的动机是需要快速识别钢类型和评估结构内的应力状态，如潜艇和船体、石油和天然气管道、电机或变压器层压板、飞机起落架以及结构可能经历局部损坏和/或修复的情况。工具、分析方法和建模的发展，以及对影响测量结果的因素的识别，将促进MBN分析的应用，并提高其作为鉴定和表征钢材料的诊断工具的潜力。工作范围将包括广泛的钢材料表征，以开发MBN生成模型，该模型将允许提取关键材料参数以进行材料的非破坏性表征。这个为期五年的项目将检查许多钢铁类型的巴克豪森噪声排放，目标是开发描述微磁巴克豪森辐射的通用模型，以增强MBN检测能力，以供未来应用。要评估的特定铁磁性钢性能将包括表征磁性和优化无取向电工钢（NOES）的铁芯损耗和磁导率，检测和测量结构钢（包括海军舰艇）的残余弹性和/或塑性应力，重点是监测用于潜艇的HY80回火脆化过程中可能发生的疲劳和碳化物沉淀迁移。识别/评估特定的钢材等级，例如在石油和天然气行业中，安装的管道可能由未知的钢材制成。作为与加拿大自然资源部CanmetMATERIALS合作的一部分，将对在受控制造过程中获得的特定NOES钢材进行巴克豪森噪声检测（见附件中表明5年内实物支持15万至25万美元的信件）。海军钢状态的确定，包括弹性残余应力的存在，塑性变形和回火脆化的检测和表征的潜力，将与加拿大国防研究发展（DRDC），大西洋研究中心（见附件的支持信）合作进行。识别可用于识别钢材的信号参数将与皇后大学的Lynann Clapham和CanmetMATERIALS合作进行。

The goal of this scientific investigation is to develop portable surface magnetic Barkhausen noise (MBN) capability for non-destructive characterization of ferromagnetic steel properties. The goal includes combined measurement of residual stress, degree of plastic deformation, grain size, carbon content, crystallographic texture, magnetic anisotropy and, in the case of electrical steels, core loss. Motivation for this work is the requirement for rapid identification of steel type and evaluation of stress state within structures such as submarine and ship hulls, oil and gas pipelines, motor or transformer laminates, landing gear in aircraft and cases where structures may have undergone localized damage and/or repair. Development of tools, analysis methods and modeling, along with identification of factors that affect the measurement outcome will facilitate application of MBN analysis and advance its potential as a diagnostic tool for identification and characterization of steel materials.The scope of work will include characterization of a wide range of steel materials, in order to develop models of MBN generation that will allow the extraction of key material parameters for non-destructive characterization of materials. The five year project will examine Barkhausen noise emissions from a number of steel types with the goal of developing general models describing micro-magnetic Barkhausen emissions in order to enhance MBN inspection capabilities for future applications. The specific ferromagnetic steel properties to be evaluated will include characterization of magnetic properties and optimization of core loss and permeability in non-oriented electrical steels (NOES), the detection and measurement of residual elastic and/or plastic stress in structural steels, including naval vessels, with a focus on monitoring of fatigue and carbide precipitate migration, as may occur during tempering embrittlement in HY80, used for submarines, and identification/assessment of specific steel grades, such as would be useful in the oil and gas industry, where installed pipelines may be made of unknown steel material. Barkhausen noise will be examined for specific NOES steels obtained under controlled manufacturing processes, as part of a collaboration with CanmetMATERIALS, Natural Resources Canada (see attached letter indicating in-kind support of $150,000-$250,000 over 5 years). Determination of naval steel condition including presence of elastic residual stress, plastic deformation and potential for detection and characterization of tempering embrittlement will be performed in collaboration with Defence Research Development Canada (DRDC), Atlantic Research Centre (see attached letter of support). Identification of signal parameters that could be used to identify steels will be performed in collaboration with Lynann Clapham at Queen's University and CanmetMATERIALS.