Stress State Detection Based on Metal Magnetic Memory Theory

2005 ◽  
Author(s):  
HaiYan Xing ◽  
RiXin Wang ◽  
MinQiang Xu ◽  
JiaZhong Zhang
Keyword(s):  
Magnetic Field ◽  
Stress State ◽  
Carbon Steel ◽  
Material Strength ◽  
Magnetic Memory ◽  
Metal Magnetic Memory ◽  
Low Carbon ◽  
Medium Carbon ◽  
Field Density ◽  
Critical Damage

The metal magnetic memory (MMM) technology, a new nondestructive evaluation (NDE) method, is an effective means for early damage prediction. However, there is so much work to do, such as the relationship between the magnetic field density and stress state. This paper aims at finding out MMM signal characteristics of critical damage stress state by tension experiments. Comparisons between MMM testing and traditional NDE method are presented. The principle of MMM testing is investigated. Different materials, low carbon steal X70 and medium carbon Q235B, are detected on-line and off-line respectively. It is found that MMM signal rules are gradually increasing up to fluctuating on the verge of yield and sharp changing of magnetic polarity on the verge of fracture. With the increase in material strength, magnetic field density of low carbon steel X70 is lower than that of medium carbon steel Q235B. This offers fundamental study for the quantitative MMM testing of critical damage stress state.

Metal magnetic memory signals from surface of low-carbon steel and low-carbon alloyed steel

2007 ◽  
Vol 14 (1) ◽  
pp. 24-27 ◽  
Author(s):  
Li-hong Dong ◽  
Bin-shi Xu ◽  
Shi-yun Dong ◽  
Ming-hui Ye ◽  
Qun-zhi Chen ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Low Carbon Steel ◽  
Alloyed Steel ◽  
Magnetic Memory ◽  
Metal Magnetic Memory ◽  
Low Carbon ◽  
Memory Signals

Experimental Study of Magnetic Field Variation Induced in Ferromagnetic Materials

2013 ◽  
Vol 312 ◽  
pp. 402-405
Author(s):  
Yang Yong ◽  
Dong Sun ◽  
Jie Ji
Keyword(s):  
Magnetic Field ◽  
Plastic Region ◽  
Steel Specimen ◽  
Fatigue Tests ◽  
Experimental Results ◽  
Magnetic Memory ◽  
Field Variation ◽  
Magnetic Field Variation ◽  
Metal Magnetic Memory ◽  
Stress Increase

The fatigue tests on 15CrMo steel specimen were carried out and the metal magnetic memory (MMM) signals were detected. The experiment shows that the magnetic signals of specimen contain the information of stress distribution in the material inside. Furthermore, the experimental results show that the magnetic signals increase initial while then decrease slightly with the stress increase from 0kN to 200kN. Though analysis the MMM signals induced by different tensile stress within the plastic region of the specimen, a simple model was derived. The experimental results are consistent with the calculated results based on the Jiles-Atherton model.

Effect of Uniaxial Stress on Magnetic Permeability and Magnetic Loss of Low-Carbon Steel in Weak Alternating Magnetic Field

2014 ◽  
Vol 678 ◽  
pp. 220-227
Author(s):  
Xiao Yang Li ◽  
Zan Dong Han
Keyword(s):  
Magnetic Field ◽  
Carbon Steel ◽  
Uniaxial Tension ◽  
Magnetic Permeability ◽  
Magnetic Loss ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Stress Increase ◽  
Magnetic Parameters ◽  
Pressure Stress

The inverse magnetostrictive effect provides a chance to detect the stress by measuring some magnetic parameters. So it is important to learn the effect of stress on some magnetic parameters. A measuring system to measure magnetic permeability and magnetic loss and a device to load uniaxial tension and pressure stress were developed. The result shows that magnetic permeability and magnetic loss increase with uniaxial tension stress increase and decreases with uniaxial pressure stress increase. It is also concluded that the relative change of magnetic permeability and magnetic loss decrease with increase of the included angle between the directions of the stress and magnetic field. These results suggest that magnetic permeability and magnetic loss can be further used to evaluate the stress in low-carbon steel.

Microstructure and Properties under Alternating Magnetism after Hot Rolling

2014 ◽  
Vol 1004-1005 ◽  
pp. 1256-1259
Author(s):  
Shen Bai Zheng ◽  
Shi Jie Liu ◽  
Hong Bin Li ◽  
Bin Feng ◽  
Xue Song Hui
Keyword(s):  
Magnetic Field ◽  
Carbon Steel ◽  
Cold Rolling ◽  
Grain Growth ◽  
Hot Rolling ◽  
Magnetic Field Intensity ◽  
Raw Materials ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
The Magnetic Field

The austenite steel after rolling was radiated by the alternating magnetism, and the effects that alternating magnetic on the austenite transition was studied. The result shows that the alternating magnetism promotes the austenitic grain growth of low carbon steel. If the magnetic field intensity is increased, it could provide better performance of raw materials to cold rolling processing.

scholarly journals Revealing the Unexpected Two Variant Pairing Shifts Due to Temperature Change in a Single Bainitic Medium Carbon Steel

2021 ◽  
Author(s):  
Adam Ståhlkrantz ◽  
Peter Hedström ◽  
Niklas Sarius ◽  
Annika Borgenstam
Keyword(s):  
Carbon Steel ◽  
Electron Backscatter Diffraction ◽  
Low Carbon Steel ◽  
Medium Carbon Steel ◽  
Low Carbon ◽  
Medium Carbon ◽  
Strong Relation ◽  
Upper Bainite ◽  
The Common ◽  
Backscatter Diffraction

AbstractThe microstructure of a low alloy medium carbon bainitic steel, austempered in the temperature range 275 °C to 450 °C has been investigated by detailed electron backscatter diffraction and variant pairing analysis. It is observed that the variant pairing tendency has two distinct changes with varying temperature. At low temperature V1-V6 is the most frequent, whereas V1-V2 is the most frequent at intermediate temperature and at the highest temperature, V1-V4 dominates. This is distinct from the literature on low carbon steel where only two dominant variants pairs, related to the common distinction of bainite into lower and upper bainite, are typically reported. The change of the variant pairing in bainite also has many similarities with the change of variant pairing in martensite when its carbon content changes. Another observation is that the morphological orientation of cementite in the bainite has a strong relation with the variant pairing at lower austempering temperatures.

Effect of slip on magnetic field under contact between aluminum alloy A1050 plate and medium carbon steel S45C bar.

2020 ◽  
Vol 2020.57 (0) ◽  
pp. J025
Author(s):  
Keisuke OKITA ◽  
Soji MATSUBAYASHI ◽  
Shintaro KANAGAWA ◽  
Koshiro MIZOBE ◽  
Katsuyuki KIDA
Keyword(s):  
Magnetic Field ◽  
Aluminum Alloy ◽  
Carbon Steel ◽  
Medium Carbon Steel ◽  
Medium Carbon

Characterization of Crack Initiation Life in Ferromagnetic Material by Metal Magnetic Memory Testing

2015 ◽  
Vol 817 ◽  
pp. 791-796
Author(s):  
Chang Liang Shi ◽  
Wei Xue Tang ◽  
Hao Zhan ◽  
Shi Yun Dong
Keyword(s):  
Magnetic Field ◽  
Crack Initiation ◽  
Normal Component ◽  
Ferromagnetic Material ◽  
Magnetic Memory ◽  
Memory Testing ◽  
Metal Magnetic Memory ◽  
Numerical Fitting ◽  
Crack Initiation Life ◽  
Metal Magnetic Memory Testing

In the geomagnetic field, stress can induce spontaneous magnetic signals in ferromagnetic materials, the method, named metal magnetic memory testing, can be potentially applied in estimating the fatigue life. In this paper, the normal component of magnetic field, Hp (y), was measured during dynamic tension test on the surfaces of ferromagnetic specimens with stress concentration factor of 5. The results indicated that the gradient of magnetic field intensity, K, was the key parameter to characterize crack initiation life. Then the numerical fitting of K and fatigue cycles were done under three level loads, 568.7MPa, 698.8MPa and 864.4MPa, meanwhile, a simple model was derived.

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