Fatigue fracture at a screw - 1.5511
Treatment : quenched and tempered
Magnification : ca. 8 : 1
Etching medium :
Sampling / Specification : fracture surface
Testing result :
fatigue fracture with arrest lines and small residual fracture
Treatment : quenched and tempered
Magnification : 500 : 1
Etching medium : 3 % alcoholic nitric acid
Sampling / Specification : transverse
Testing result :
low surface decarburization 0,02 mm deep