Cutting test samples:
Use precision sample cutters (cold cutting, hot cutting) to avoid affecting the material structure.
Grinding & Polishing:
Preparation of sample surface for metallographic microstructure examination.
Hardness testing:
Rockwell, Vickers, Brinell – measure surface hardness & depth of hardening.
Microstructure testing – determine depth of hardening layer by metallographic microscope.
Non-destructive testing (NDT):
Ultrasonic (UT), Eddy Current – crack detection, heat-hardening layer depth
Magnetic Particle Testing (MPT) – identifies surface cracks.
Actual testing:
Check the load, torque to ensure the quality of the product after heat treatment.
