Measurement of the magnetic flux density at stress concentration area of medium carbon steels using a Scanning Hall Probe Microscope (SHPM).

2018 ◽  
Vol 2018.55 (0) ◽  
pp. C034
Author(s):  
Tatsuro NAKASHIMA ◽  
Katsuyuki KIDA
Keyword(s):  
Stress Concentration ◽  
Magnetic Flux ◽  
Flux Density ◽  
Carbon Steels ◽  
Magnetic Flux Density ◽  
Hall Probe ◽  
Medium Carbon ◽  
Medium Carbon Steels ◽  
Probe Microscope

The Influence of Stress Ratio on Changes in Magnetic Flux Density around Fatigue Crack Tips of Carbon Tool Steel

2011 ◽  
Vol 83 ◽  
pp. 210-215 ◽  
Author(s):  
Takashi Honda ◽  
Katsuyuki Kida ◽  
Edson Costa Santos ◽  
Hitonobu Koike ◽  
Justyna Rozwadowska ◽  
...  
Keyword(s):  
Magnetic Flux ◽  
Crack Growth ◽  
Flux Density ◽  
Tool Steel ◽  
Fatigue Cracks ◽  
Three Dimensional ◽  
Magnetic Flux Density ◽  
Hall Probe ◽  
Steel Component ◽  
Stress Ratios

Fatigue failure of steel occurs when cracks form in a component and continue to grow to a size large enough to cause fracture. In order to understand the strength of a steel component, it is important to locate these cracks. We developed a scanning Hall probe microscope (SHPM), equipped with GaAs film sensors to observe fatigue cracks at room temperature in air while they were growing. In our previous works [1,2], the correlation between crack growth and magnetic field in high carbon tool steels (JIS SKS93 and JIS SUJ2) were determined. We also reported the sensitivity of the SHPM equipped with a three-dimensional line-probe that was developed to decrease the sensor gaps. By using the line-probe sensor we succeeded to measure the magnetic flux density distributions in very close proximity to the specimen’s surface. However, in order to further understand the relation between magnetic flux density and crack growth, other materials, microstructures and fatigue test conditions should be evaluated. In the present work, we focus on the effect of stress ratios on the changes of the magnetic flux density in annealed carbon tool steel.

The Observation of Changes in the Magnetic Field due to the Crack Initiation under Different Stress Ratio Conditions

2011 ◽  
Vol 217-218 ◽  
pp. 1408-1413 ◽  
Author(s):  
Takashi Honda ◽  
Katsuyuki Kida ◽  
Edson Costa Santos ◽  
Justyna Rozwadowska ◽  
M. Uryu
Keyword(s):  
Magnetic Field ◽  
Magnetic Flux ◽  
Crack Growth ◽  
Flux Density ◽  
Fatigue Cracks ◽  
Three Dimensional ◽  
Magnetic Flux Density ◽  
Hall Probe ◽  
Steel Component ◽  
Stress Ratios

Fatigue failure of steel occurs when cracks form in a component and continue to grow to a size large enough to cause fracture. In order to understand the strength of a steel component, it is important to locate these cracks. We developed a scanning Hall probe microscope (SHPM) equipped with GaAs films sensors and observed fatigue cracks at room temperature in air while they were growing. In our previous works, we determined the correlation between crack growth and magnetic field in high carbon tool steels (JIS SKS93 and JIS SUJ2). We also reported the sensitivity of the SHPM equipped with a three-dimensional line-probe that was developed to decrease the sensor gaps. By using the line-probe sensor we succeeded to measure the magnetic flux density distributions in very close proximity to the specimen’s surface. However, in order to further understand the relation between magnetic flux density and crack growth, other materials, microstructures and fatigue test conditions should be evaluated. In the present work, we focus on the effect of stress ratios on the changes of the magnetic flux density in annealed carbon tool steel.

Localization of Partial Magnetization around Artificial Slits in Square Bars of Medium Carbon Low Alloy Steel JIS S45C

2011 ◽  
Vol 217-218 ◽  
pp. 1297-1302 ◽  
Author(s):  
M. Uryu ◽  
Katsuyuki Kida ◽  
Takashi Honda ◽  
Edson Costa Santos ◽  
K. Saruwatari
Keyword(s):  
Stress Concentration ◽  
Three Dimensional ◽  
Hall Probe ◽  
Low Alloy Steels ◽  
Film Sensor ◽  
Medium Carbon ◽  
Alloy Steels ◽  
Probe Microscope ◽  
Non Destructive

Fatigue failure of steel occurs when cracks form and grow in the material’s stress concentration area. In order to understand the relation between stress concentration and crack propagation phenomena, non-destructive evaluation methods that can be related to in-situ measurements around the stress concentration area are necessary. In the present work, we developed a scanning Hall probe microscope (SHPM) equipped in a GaAs film sensor and observed three dimensional magnetic fields at room temperature in air. Medium carbon low alloy steels specimens (JIS, S45C) were used in the experiments. Only the area around the artificial slit had been magnetized and the effect of the magnetization area on the artificial slit was observed.

Changes in Magnetic Flux Density Distributions of Chromium Molybdenum Steel (JIS, SCM440) by Slit Opening and Crack Growth

2016 ◽  
Vol 703 ◽  
pp. 376-379
Author(s):  
Katsuyuki Kida ◽  
Tatsurou Nakashima ◽  
Masayuki Ishida
Keyword(s):  
Magnetic Fields ◽  
Magnetic Flux ◽  
Crack Growth ◽  
Flux Density ◽  
Magnetic Measurement ◽  
Magnetic Flux Density ◽  
Hall Probe ◽  
Fatigue Process ◽  
Steel Material ◽  
Molybdenum Steel

Non-destructive evaluation methods using magnetic measurement systems have been developed. However, there are a few approaches to the effect of cracks on magnetic fields during whole fatigue process. In the present work, slit samples of as-received chromium molybdenum steel material (JIS, SCM440) including no retained austenite was fatigue tested. Fatigue process was observed using a scanning Hall probe microscope in order to investigate the effect of cyclic slit opening and crack growth on residual magnetic fields. It is found that the cyclic opening-closing of the slit decreases the magnetic flux density even where no tensile stress was applied.

Three-Dimensional Scanning Hall Probe Microscopy for Final Stage of Crack Growth of Chromium Molybdenum Steel SCM440

2017 ◽  
Vol 748 ◽  
pp. 386-390
Author(s):  
Tatsurou Nakashima ◽  
Katsuyuki Kida
Keyword(s):  
Magnetic Flux ◽  
Crack Propagation ◽  
Crack Growth ◽  
Flux Density ◽  
Evaluation Method ◽  
Three Dimensional ◽  
Vertical Component ◽  
Magnetic Flux Density ◽  
Hall Probe ◽  
Non Destructive

Crack propagation around the stress concentration area causes fatigue failure. Non-destructive method is necessary for monitoring structure fatigue before destruction. We focused on a magnetic non-destructive evaluation method for crack growth. In order to understand the relation between crack propagation and changes in magnetic flux density, we observed the position of the positive and negative magnetic flux density distributions around the crack of tool steel (SCM440) plate using a scanning Hall probe microscope (SHPM). We found that the vertical component of the three-dimensional magnetic flux density moved as the crack growth. Furthermore, the magnetic component which is parallel to the tensile stress appeared just before destruction of the specimen.

Effects of Magnetizations on Three Dimensional Magnetic Flux Density of Pre-Cracked Medium Carbon Low Alloy Steel (JIS S45C)

2011 ◽  
Vol 83 ◽  
pp. 230-236 ◽  
Author(s):  
Katsuyuki Kida ◽  
Edson Costa Santos ◽  
Takashi Honda ◽  
Hitonobu Koike ◽  
Justyna Rozwadowska ◽  
...  
Keyword(s):  
Fatigue Cracks ◽  
Three Dimensional ◽  
Magnetic Flux Density ◽  
Hall Probe ◽  
Low Alloy Steels ◽  
Film Sensor ◽  
Medium Carbon ◽  
Alloy Steels ◽  
Crack Tips ◽  
Probe Microscope

Fatigue failure of steel occurs when cracks form in a component and continue to grow to a size large enough to cause rupture. In order to understand the crack initiation and propagation phenomena, non-destructive evaluation methods that can be correlated to in-situ measurements around the crack tips are necessary. In the present work, we developed a scanning Hall probe microscope (SHPM) equipped in a GaAs film sensor to observe fatigue cracks at room temperature in air while they were growing. Medium carbon low alloy steels specimens (JIS S45C) were used in the experiments. Only the area around the crack tip was magnetized and the changes at the crack tips were observed.

Observations on the structure at the transformation interface of pearlite in steel

1990 ◽  
Vol 48 (4) ◽  
pp. 200-201
Author(s):  
F. A. Khalid ◽  
D. V. Edmonds
Keyword(s):  
Room Temperature ◽  
Thin Foil ◽  
Carbon Steels ◽  
Model Alloy ◽  
Growth Interface ◽  
Medium Carbon ◽  
Solution Treated ◽  
Medium Carbon Steels ◽  
Alloy Carbide ◽  
Hot Rolled

The austenite/pearlite growth interface in a model alloy steel (Fe-1 lMn-0.8C nominal wt%) is being investigated. In this particular alloy pearlite nodules can be grown isothermally in austenite that remains stable at room temperature, thus facilitating examination of the transformation interfaces. This study presents preliminary results of thin foil TEM of the austenite/pearlite interface, as part of a programme of aimed at studying alloy carbide precipitation reactions at this interface which can result in significant strengthening of microalloyed low- and medium- carbon steels L Similar studies of interface structure, made on a partially decomposed high- Mn austenitic alloy, have been reported recently.The experimental alloys were made as 50 g argon arc melts using high purity materials and homogenised. Samples were hot- rolled, swaged and machined to 3mm diameter rod, solution treated at 1300 °C for 1 hr and WQ. Specimens were then solutionised between 1250 °C and 1000 °C and isothermally transformed between 610 °C and 550 °C for 10-18 hr and WQ.

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