Hi.
I need some tips for an abrasive disc that is good for cutting steel that has been heat treated(60-65 HRC).
In the workshop we use the same disc as we use for softer steel (25-30 HRC), but when we have a hardened one, the disc breaks after the cutting is made.
Any useful tip would be...
A bearing is sold to a customer and works good for 1-2 weeks, then it breaks.
When it came back, he has a different structure than it should have. A good structure is quenched(martensite) and it came back with an annealing structure(speroidised, fine globular cementite).
I want to know what...
I have a roller that has been heat treated(quenched and tempered) and it has a strange microstructure. I think it's troostite but i don't know for sure.
It must be martensite with some small round carbides.
I'm having problems with S705 BOHLER tool steel as I can't find anything about the microstructure. Can anybody please help me with this? This steel is quenched and tempered, so it must have small carbides and a clean structure. I didn't find any photo on the web regarding the structure.
What parameters of heat treatment should i use for steel SH15G-v and SH15SG-v if i want to reaveal carbide bands? I use the same heat treatment for both steel marks but it's not always good , because sometimes instead of white bands i get them black and can't figure out how to proper analyse them.
I know that carbide bands form in the process of hot forming and you have to cool the material to stop them, but it is possible that you can diminish them by simply changing the heat treatment when preparing the sample for microstructural analysis?
We have a tank with 11 tons of cold oil (50 grades C) with the cooling speed of 75 grades C/s. Out of 2000 rolls 100Cr6(52.100), only 10-15 rolls have high levels of bainite , aprox 40-60% and harndness of 30-50 HRC. It is possible that the oil is bad or could be another reason of this problem?
