scholarly journals Multiparameter method of surface hardening quality testing

2018 ◽  
Vol 224 ◽  
pp. 03016
Author(s):  
Vladimir Kostin ◽  
Olga Vasilenko ◽  
Alexander Byzov
Keyword(s):  
Coercive Force ◽  
Hysteresis Loop ◽  
Surface Hardening ◽  
Hardened Layer ◽  
Magnetic Characteristics ◽  
Software System ◽  
Residual Induction ◽  
Single Measurement ◽  
Measurement Results ◽  
Quality Testing

Measurements of the magnetic characteristics (coercive force, residual induction, induction of saturation) of objects that had different thicknesses of the hardened layer were made. The influence of an unstressed core on the measurement results, as well as the depth of the strengthened layer on the shape of the hysteresis loop, is investigated. The conclusion is made that it is possible to estimate the properties of a hardened layer by means of a single measurement with the help of the hardware-software system DIUS-1.15M

Coercimetric Quality Testing of Steel Parts. Ural School of Coercimetry

NDT World ◽  
2015 ◽  
Vol 18 (4) ◽  
pp. 9-13
Author(s):  
Муриков ◽  
Sergey Murikov ◽  
Костин ◽  
Vladimir Kostin ◽  
Сташков ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Coercive Force ◽  
Hardened Layer ◽  
Scientific School ◽  
Deformation Degree ◽  
Practical Applications ◽  
Quality Testing ◽  
Hardened Layer Thickness ◽  
The Impact

The article shows the main areas of application coercimetric NDT method. The article presents historical information about the method founders who represents the Ural scientific school of magnetism. The main limitations of the method and practical applications of one-parameter and multiparameter coercimetric techniques are shown. Problems of magnetic quality inspection of quenched and tempered steels with different carbon contents and different degrees of alloying are considered. The possibility of monitoring the quality of steel products surface hardening with the use of external converters is demonstrated. Guidelines for external electromagnet size selection in dependence on a hardened layer thickness are presented. The brief analysis of the impact of current and residual stresses on the coercive force of steel products has been fulfilled. Problems of coercimetric inspection of stresses and steel plastic deformation degree are indicated; these problems are connected with varied behaviour of the coercive force under elastic extension and at high degrees of plastic deformation in the stage of pre-destruction. The originally developed technique for coercimetric quality control of forming rolls is presented. Information about modern coercimeters developed at the Institute of Metal Physics is provided.

Physical methods of research and monitoring

2019 ◽  
Vol 85 (1(I)) ◽  
pp. 35-44
Author(s):  
S. G. Sandomirski
Keyword(s):  
Heat Treatment ◽  
Coercive Force ◽  
Remanent Magnetization ◽  
Structural Changes ◽  
Mechanical Load ◽  
Magnetic Hysteresis ◽  
Steel Structures ◽  
Magnetic Characteristics ◽  
Magnetic Parameters ◽  
Saturation Intensity

The main magnetic parameters sensitive to the structure of steels are the parameters of their saturation loop of magnetic hysteresis: the coercive force Hcs and remanent magnetization Mrs. The saturation magnetization or saturation intensity Mr is most sensitive to the phase composition of steels. The variety of steel grades and modes of technological treatment (e.g., heat treatment, mechanical load) determined the use of magnetic structurescopy and magnetic characteristics — the coercive force Hc, remanent magnetization Mr , and specific hysteresis losses Wh on the subloops of the magnetic hysteresis of steels — as control parameters in diagnostics of the stressed and structural states of steel structures and pipelines. It has been shown that changes in Hc, Mr , and Wh are more sensitive to structural stresses and structures of steels than the parameters of the saturation hysteresis loop of magnetic hysteresis (Hcs, Mrs, and Mrs). The formulas for calculating Hc, Mr and Wh are presented to be used for estimation of changes in the parameters upon heat treatment of steels. Features of the structural sensitivity of the subloop characteristics and expediency of their use for magnetic structural and phase analyzes are determined. Thus, the range of changes in Ìr attributed to the structural changes in steels upon gradual Hm decrease is many times wider compared to the range of possible changes in Mrs under the same conditions. Conditions (relations between the magnetic parameters) and recommendations regarding the choice of the field strength Hm are given which provide the justified use of Hc, Mr and Wh parameters in magnetic structurescopy

Селективный магнитный контроль толщины и степени упрочнения поверхностных слоев на стальных объектах

2021 ◽  
pp. 39-45
Author(s):  
А.В. Бызов ◽  
Д.Г. Ксенофонтов ◽  
В.Н. Костин ◽  
О.Н. Василенко
Keyword(s):  
Magnetic Flux ◽  
Internal Field ◽  
Hardened Layer ◽  
Strength Properties ◽  
Hardened Steel ◽  
Magnetic Characteristics ◽  
Surface Layers ◽  
Magnetic Parameters ◽  
Maximum Value ◽  
Tangential Field

The dependences of measured locally magnetic characteristics of surface-hardened steel objects on the thickness and physical properties of their surface layers are studied. It is shown theoretically and experimentally that a change in the thickness of the hardened layer on the surface of steel objects affects on the magnitude of the tangential field component on the surface of the object in the interpolar space significantly , as well as the change in the strength properties of the layer affects the magnitude of the magnetic flux in the "transducer-object" circuit. It is proposed to use this difference in magnetic parameters for selective testing of the surface hardening quality. It is shown that the coercive force measured locally by the internal field and the maximum value of the magnetic flux, which can be measured using a single transducer in single measuring cycle, can be used as diagnostic parameters.

Research of Surface Hardening Based on Transverse Feed Grinding

2006 ◽  
Vol 532-533 ◽  
pp. 584-587 ◽  
Author(s):  
Ju Dong Liu ◽  
Gui Cheng Wang ◽  
Qin Feng Li ◽  
Hong Jie Pei ◽  
Zhi Hong Jia ◽  
...  
Keyword(s):  
Surface Hardening ◽  
Hardened Layer ◽  
Grinding Temperature ◽  
Micro Hardness ◽  
Transitional Area ◽  
And Performance ◽  
Grinding Machine ◽  
Grinding Temperature Field ◽  
40Cr Steel

The structure and performance of the hardened layer in this paper has been researched by means of transverse feed grinding 40Cr steel on a plane grinding machine, the result shows that under the action of the grinding temperature field, there are different structural change rules and distributing characteristics of micro-hardness. Although there is always a softened band, which is made up of a transitional area and an unhardened area or a temper area in the hardened layer, the reasonable softened band is conducive to the improvement of wear-resistant quality of a hardened layer under the condition of oil lubrication.

Effect of Heat Treatment Parameters in Plasma Arc Surface Hardening of AISI 4340 Steel

2014 ◽  
Vol 699 ◽  
pp. 105-110 ◽  
Author(s):  
Abdullah Wagiman ◽  
Md Saidin Wahab ◽  
Zazuli Mohid
Keyword(s):  
Surface Hardening ◽  
Scanning Speed ◽  
Hardened Layer ◽  
Plasma Arc ◽  
Heating Source ◽  
Fine Grain ◽  
4340 Steel ◽  
Operating Current ◽  
Microstructure Examination ◽  
Flame Hardening

Flame hardening has been traditionally used for selective surface hardening of steel. This technique frequently resulting in imprecise harden area and part distortion when overheated. Focused heating source such as plasma arc can be an alternative to overcome this problem. In this work, plasma arc is scanned at the 4340 steel surface to improve the hardness. The variable parameters investigated were at scanning speed and operating current. Four types of surfaces were observed after they are scanned with plasma arc. They are fully-melted, partially-melted, non-melted continuous and non-melted intermittent where each type of surface has different roughness value. This work found that scanning speed and operating current has significantly influence the type of surface and roughness values. Analysis on non-melted surface gives the maximum depth of hardened layer of about 187 μm as well as hardness values of about 990 HV50. It is also observed that the depth of hardened layer and hardness value is significantly decreasing with increase in scanning speed or the decrease in operating current. Microstructure examination on hardened layer revealed that the increase of hardness is due to formation of fine grain martensitie structure.

Effect of laser surface hardening on magnetic characteristics of a carbon steel under loading

2008 ◽  
Vol 44 (8) ◽  
pp. 560-565 ◽  
Author(s):  
E. S. Gorkunov ◽  
S. Yu. Mitropol’skaya ◽  
S. M. Zadvorkin ◽  
A. L. Osintseva ◽  
D. I. Vichuzhanin
Keyword(s):  
Carbon Steel ◽  
Surface Hardening ◽  
Laser Surface ◽  
Magnetic Characteristics ◽  
Laser Surface Hardening

Control Measurements at the Manufacturing of Metallic Products

2011 ◽  
Vol 180 ◽  
pp. 232-237
Author(s):  
Wiesław Tarczyński ◽  
Ryszard Kopka
Keyword(s):  
Control Panel ◽  
Production Plant ◽  
Single Measurement ◽  
Product Ratio ◽  
Central Computer ◽  
Measurement Results ◽  
Measurement Cell

This article presents the developed system for collecting, memorising and analysing of the measurements conducted in a production plant. It describes the algorithm of the software im-plemented on the control panel and managing the work of a single measurement cell. Moreover the procedure of collecting of the measurement results by two modes: automatically and manually and the procedure of estimating of product ratio quality. Mentioned are also the practices for controlling of the communication with the central computer as well as archiving of the collected measurement results.

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