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mfgengear: this is plasma nitriding of 1045 steel which is given post oxidation and passivation treatment to improve wear and corrosion resistance. Not sure why passivation? i am aware of Ams2759/8 for ionic nitriding although it does not outline any post nitriding treatment with oxidation.

are there any ASTM or AMS standard for all three processes? Aware of AMS2759/8 for plasma nitriding. Looking for industry standards for post oxidation and passivation. I found literature on post oxidation after plasma nitriding and its benefit in improving corrosion resistance. A heat treat...

a pattern of axial cracks with pre spall shape around the centre axial crack observed in inner ring of 52100 ball bearing. Surface surrounding the area of axial crack shows dents. one inner ring showed spall and multiple axial cracks at several intervals. what can be the cause? bearing ran for...

I am looking for input regarding how to determine the acetylene gas flow rate for vacuum carburizing based on the total surface area of the basket. Vacuum furnace manufacturer recommendation is 150-200nl/hr of acetylene for 1square meter. how does this translate into 1500slph? I am taking in to...

Thanks guys for your inputs.

Need input regarding should annealing be performed on 4340 hardened bars? 4340 bars after heat treating at 1525F/oil quench/ tempered at 1190F. Hardness lower than 28hRC. IS full anneal required prior to rehardening and tempering at temperatures around 1125-1140F.

@Lyrl: Microstructure looked like annealed grains with grain size number between 5-6. After 5hours of annealing, the grains did not coarsen a lot which was surprising. I was expecting it to be in 3-4 range. Indentation for hard ones showed more sinking in type of behavior around the indent...

The rivets were hot mounted and then tested crosssectionly using vickers microhardness tester at 500gmf. rivets are 0.020"dia with 0.060" long. 1010 steel rivets heat treated at 1700F for 1,1.5hr and 5hrs soak time. Measurement on 5 rivets after 5hours of soak time gave 3 results less than...

Need information w.r.t annealing of 0.06% C steel rivets. Annealing at 1700F for 1hr is producing fully annealed structure with grain size number between 6 and 7. Hardness measurement using vickers microhardness is not consistent. Need the hardness strictly max 60HRB. Same rivet giving different...