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A Sensitivity Mapping Technique for Tensile Force and case depth Characterization Based on Magnetic Minor Hysteresis Loops

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Chinese Journal of Mechanical Engineering 2020年第6期33卷 93-104页

作者： Cunfu He Wenqiao Dou Xiucheng Liu Meng Yang Ruifang Zhang Faculty of Materials and Manufacturing Beijing University of TechnologyBeijing 100124China

In the nondestructive testing and evaluation area,magnetic major hysteresis loop measurement technology are widely applied for ferromagnetic material *** the characterization ability of major hysteresis loop measurement technology greatly varies as the evaluated target *** solve this limitation,magnetic minor hysteresis loops,which reflect the responses of ferromagnetic material magnetization in a systematic way,is *** by plenty of information carried by the minor loops,the sensitivity mapping technique was developed to achieve the highest sensitivity of minor-loop parameters to the nondestructively evaluated *** this study,for the first time,the sensitivity mapping technique is used to measure the tensile force in a steel strand and evaluate the effective case depth in induction-hardened steel *** method and procedures for the sensitivity mapping technique are given before experimental *** obtained experimental results indicate that the linear correlation between the induced voltage(or the magnetic induction intensity)and the tensile force(or effective case depth)exists at most of the locations in the cluster of minor *** obtained sensitivity maps can be used to optimize the applied magnetic field(or excitation current)and the analyzed locations at the minor loops for achieving the highest *** the purpose of tensile force measurement,it is suggested that the strand should be firstly magnetized to the near-saturation state and then restored to the remanent *** this way,the highest sensitivity is obtained as about 15.26 mV/*** for the induction-hardened steel rods,the highest sensitivity of magnetic induction intensity to the effective case depth occurs under low magnetic field conditions and the absolute value of the highest sensitivity is about 0.1110 T/*** indicates that if the highest sensitivity is required in the case depth evaluation,the induction-hardened steel rods are

关键词： Sensitivity mapping technique Magnetic minor hysteresis loop Tensile force case depth

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维普期刊数据库

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Simulation of case depth of Cementation Steels According to Fick’s Laws

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Journal of Iron and Steel Research International 2012年第11期19卷 71-78页

作者： S R Elmi Hosseini Faculty of Engineering Department of Materials Science and EngineeringUniversity of Sistan and Baluchestan

The carburizing process is the enrichment of the depth of low carbon steels with carbon. It leads to samples with a combination of high surface hardness and high core toughness and to an impact strength that is required for many engineering parts. The material studied is a low carbon steel. The carbon content is little in this type of steel （wc = 0.2 ~）. The calculation of case depth is very important for cementation steels that are hardened in the carburi- zing process. The effective case depth is defined as the perpendicular distance from the surface to a place at which the hardness is HV 550. Nowadays, a great number of studies have been carried out on the simulation of effective case depth, but no studies have been conducted to determine the numerical relation between the total case depth on one hand and the carburizing time and the effective case depth on the other hand. The steel specimens were subjected to graphite powder. Then, they were heat treated at 925 ~C for about 3, 5, 8 and 12 h, respectively. Then, these parts were quenched in oil. To determine the effective case depth, the micr0hardness test was performed on the cross-section of specimens. Plotting the case depth vs carburizing time, the required conditions for obtaining the specified case depth were determined. Also, the comparison between the case depths in numerical solution and the actual position in pack carburizing was performed.

关键词： cementation steel carburizing case depth Fick's law simulation

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维普期刊数据库

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Research on Eddy Current Testing System of the Carburized Layer depth of 20CrMnTi Steel

Research on Eddy Current Testing System of the Carburized La...

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14～(th) Congress of International Federation for Heat Treament and Surface Engineering

作者： CHENG Xiao-min LI Na WU Xin- wen FANG Hua-binSchool of Materials Science and Engineering Wuhan University of Technology Wuhan China School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai China

＜正＞ In this paper the carbon distribution in the carburized layer of 20CrMnTi steel was studied. The relationship between the depth of a carburized layer and the surface carbon distribution was established. Eddy current testing system of the case depth of this carburized steel was built by using ANSYS software as second development platform.

关键词： carburizing case depth eddy current testing finite element

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