Insufficient austenitization at the quenching - 1.2242
Treatment : quenched and tempered
Magnification : 200 : 1
Etching medium : 3 % alcoholic nitric acid
Sampling / Specification : transverse
Testing result :
bad heat treated - underhardened :
mixture of ca. 50 % heat treated structure
and 50 % annealing structure
Treatment : quenched and tempered
Magnification : 500 : 1
Etching medium : 3 % alcoholic nitric acid
Sampling / Specification : transverse
Testing result :
bad heat treated - underhardened :
mixture of ca. 50 % heat treated structure
and 50 % annealing structure