Our DHAMES - Smart magnetic NDT system measures and analyses DAME profile, Harmonic levels and equivalent magnetic induction (B-Vt) loop using bespoke designed EM yoke and allows for generating correlation with material properties for qualitative and quantitative evaluation
DAME profiles
DAME profile parameters:
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Peak height (PH) and position (PP)
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Trough height (TH) and position (TH)
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Point of Intersection (PoI)
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Slope at PoI.
Harmonic levels
Harmonic parameters:
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3rd Harmonic level (SHL3)
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5th Harmonic level (SHL5)
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7th Harmonic level (SHL7)
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Total Harmonic Distortion (THD)
B-Vt Loops
Equivalent BH parameters:
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Equivalent coercive force (Hc eq.)
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Slope at Hc eq.
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Equivalent residual induction (Br eq.)
Qualitative and Quantitative Analysis using DHAMES software
In the DHAMES software, from the parameters measured from the DAME profile, Harmonics levels, B-Vt loop, one can instantly make qualitative evaluation of material properties such as hardness and case-depth etc. by setting appropriate lower and upper limits
Qualitative evaluation of Nitro-carburised compound layer thickness by setting limits for the trough height of the DAME profiles
From the DHAMES measurement software, one can also make quantitative evaluation of material properties such as hardness and case-depth etc by suitable calibration using a set of samples with known material properties
Calibration of the trough heights of the DAME profiles (X) against the compound layer thickness values (Y) in a set of 4 samples with known values of material property
Graphical representation of quantitative evaluation of material property from the calibration of the DAME profile parameters using a set of 4 samples with known values of material property
Application for Determination of Case-depth Value in Induction Hardened Components
Determination of induction hardened case-depth values from DAME profile Trough height in Ball pins
DAME profiles from ball pins with different case-depths
Correlation of trough height with case-depth
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Each DAME profile has a unique shape representing the material properties and hence the magnetic behaviour of a ferromagentic steel component.
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DHAMES measurements can achieve a resolution of less than 0.1 mm in case-depth with precise design of our EM yoke to suite the component geometry.
Application for Determination of Case-depth Value in Carburised Components with Complex Geometries
Determination of carburised case-depth values from DAME profiles in spiral bevel gear
DAME profiles from diffferent flanks on two gears with different case-depths
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Gear 1 has case-depth of 1.6 mm and Gear 3 has case-depth of 1.85 mm
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DHAMES system can achieve a resolution of less than 0.1 mm in case-depth with precise design of our EM yoke to suite the component geometry
Application for Determination of Case-depth Value in Nitrided, Nitro-carburised Components
Determination of compound layer thickness from DAME profile Trough height in Nitro-carburised piston cylinders
DAME profiles from diffferent pistons
Correlation of Trough height with Compound layer thickness in different pistons
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DHAMES system can achieve a resolution of +/- 1 micron in the thickness of nitrided compound layer!
Application for Material Quality Assessment in High Temperature Exposed Ferromagnetic Steel Components in Power Plants
Differentiating pipe sections with tempered martensite and aberrant microstructures (mix of ferrite and martensite) in P91 steel power plant pipes using DHAMES measurement system
DAME profiles from sections with diffferent microstructures
Point of Intersection from DAME profiles vs Hardness (HV)
Equivalent BH loops (B-Vt Loops) from sections with diffferent microstructures
Equivalent Coercive force (Hc eq.) from Equivalent BH loops vs Hardness (HV)
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Quantitative correlation between DHAMES parameters (PoI & Hc eq.) and Hardness (HV) values from normal and aberrant microstructural sections in P91 steel pipes obtained using our DHAMES system
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DHAMES measurements clearly distinguish the martensite microstructures with higher hardness (175-193 HV) values and the aberrant microstructures with lower hardness (129 - 165 HV) values