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@EdStainless and @TemperedMartensite so far i did not check the heat treatment process. But for further description, this is the process flow of heat treatment on the company : After finish lathing, the next process is precleaning, using Teclean (the liquid is vapourized and the vapour is used...

I have attached other files from my case. I follow the advice from rp about scotchbrite, and that is the result. My prediction so far, it is because some void made from the casting process. But I am not sure. The defect is found on after-grinding process, in high ammount. There are no reports on...

@all the defect is found on in-house production, which means it never leave the company. The production line consist of lathing process from bar and tube material, heat treatment to make the double-temper martensitic structure, grinding + super finish, and assembly. @TVP Oh, okay, i`ll try to...

@rp what if the pores were made from the making of the steel from the foundry? Like the pores made from the bubbles of CO2? If the pores is deep in the steel, it need to be grinded to peel and reveal it, is it possible? @TVP it is the highest magnification in my lab, is it not good enough to...

This is my first case. I found this in the small size bearing on the face, on outer diameter of the bearing. The material is JIS based standard SUJ2 with 1,3-1,6 percent chrome. It is restricted from the company for publishin any other materials than this, so i want to know any other opinions...

do you think there are any correlation with the crystal structure and the solubility of Ni on Al?

so the Al precipitate stable at high temperature? thank you TVP

thank you metengr

according to my study, it is very difficult to detect, avoid, or characterize the failure caused by sour environment, especially with the H2S contain. Even by using special steel that can withstand the hydrogen cracking, we still found the hydrogen cracking. So my suggest is to do the PWHT to...

Nice to meet you all =D my name is Oka Mahendra, from Indonesia, currently working at NSK Bearing Manufacturing in Jakarta Plant as Failure Analysis and Investigation staff. I want to ask to all material engineer about the Alumunium alloy. When Nickel is added to alumunium alloy, the heat...