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Dear Metallurgist Master and Enthusiast... Herewith attached microstructure of 0.45%C after Heat Treatment process. According to the submitters, the process step were: - Steel Bar - Hot Forging - Carburizing - Tempering - Case Hardening - Tempering We have notice Pearlite and Ferrite...

Here attached SEM images file for the suspected spot. It locates on the raceway, with a high probability. The size was ranged from 3~10 um. Metalhead, The data we collected was like this spot, round and having Al-Mg-O compound on them. We tried to understand the spot by cracking the bearing...

Dear TVP, For weeks of our simulation, we often found Al-Mg-O particle with occurence particle size about 5 micron on the surface of the bearing steel. By this assumption, we believed that if the occurence on the surface is very high, then it is almost sure that we will found similar compund...

Dear all, Due to some circumstances, i change my handle to metalfate, nice to meet you all. @Tmoose, yes it is.This research was conducted to better understand the origin of such phenomenon. @TVP, great! Thanks for the information. This will help us to move our research to next step. From our...

@metengr We will post if anything new found. Yes, we also found similar defect with butterfly-like sub surface inclusion. But i think this one is a lil bit different. Oh, i want to ask also, is there any effect to the inclusion, if bearing steel undergo heat treatment? We suspect this problem...

@metengr On several investigation, we too believed in subsurface inclusions causing the cracking defects on bearing steel after heat treating. Our experience conclude that the size must be higher than 10 mikrons with cluster of its within some area to give significant effects to the bearing...

Dear eng-tips material engineering master, I would want to ask about inclusion in bearing steel. For two months we conduct investigation regarding material defect on bearing steel. From SEM/EDAX data, we believed that the "foreign material" was grinding stone, which contain Aluminum, Silicone...