The nitride in 30CrNi steel and its composition along boundaries have been studied by meansof scanning Auger microprobe.The nitride identified metallographically is Zr(C,N)whichcontains a small amount of Ti and O.The interface width between the Zr(C,N)and the matrixis about 1.6 μm.An Fe-rich shell is.found on the surface of Zr(C,N)which appeared on thefracture surface.The thickness of shell is 0.1-0.8μm.The Fe concentration of its outmostlayer is 3-18 at.-% and decreases exponentially along the depth direction.
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