I am not really experienced in carbonitrided steel, but for proper fractographic analysis we need:

1. To know "history" of a specimen. Was your tensile specimen first machined from a soft steel, then carbonitrided, then tested? Why tensile (not wear or such) test was needed for surface hardening application?

2. To know a place from which your picture was taken. Is it a fracture surface, or a side of your specimen?

3. To have pictures taken at different magnifications. One magnification is never enough. Often low magnifications (like x10 or x50) are very useful.

4. To have pictures of good quality. Your picture was taken at 30 kV, a way too high voltage for your application, it makes observation difficult. Try 3-5 kV instead.

Hello sir image was taken on core of the specimen . Specimen is low carbon steel surface treated using carbonitriding technique