SPALLING MECHANISM OF NITRIDED LAYER OF AUSTENITIC STEEL 4Cr14Ni14W2Mo

The tendency of spalling of the nitrided layer of the hot rolled austenitic steel4Cr14Ni14W2Mo exhibits close relation to the nitrided surface orientation relative to the rol-led steel rod.It is found that the dislocations in the imperfectly recrystalized steel align asparallel dislocation walls in macroscopic extent,and the thickness of the“white sublayer”inthe nitrided layer is much larger at the surface which is parallel to the dislocation walls.Onsuch surface the spalling of the nitrided layer happens often.