The surface etched pattern is the hardened zone. A 6mm is a 3 kHz depth. When using induction we refer to kW's and kHz the kW is how much power & the kHz is how deep it heats.
Also can get good results using a sand/glass bead or steel shot if acid is not desired.
The bands you see on the...
Induction power supplies use DI water between 50 micromo and 70 micro mo. The used of 0 micro mo Di is hungry and will attack copper or stainless. Put 30 % glycol mixture and it buffers the Di an it will stay in the 50-70 window for up to a year with no corrosion.
Fred Specht
Ajax Tocco Magnethermic
induction Heating is the most efficent means of heating vs all other means, likely 85% to heat a vessel for creating steam. However the capitol expense is the highest for induction vs other means of heating.
20% seems high,
last months "Forging" magazine had an article, just up your ally. "Defects in Hot forgings" by H.J. Henning. You must read @ www.forgingmagazine.com on page 21.
22% is really high, usually not more than 15%, likely for this should be less than 10%. Suprised you get such high hardness with such high % of polymer.
Not grinding crack unless burning and you would see.
Leaving in temper at longer time will make no difference, need high oven temp, add...
During the Magneflux process, the dye can stay in a forging parting line and look like a crack if not cleaned really good. Have you cut the part to see if the crack is really under the parting line? This has fooled me in the past.
Fred Specht
Ajax TOCCO
847606-9462
Put a 1/4" aluminum plate on inside of door/panel, will be 1/3 of heat now generated, if put copper would be 1/4 of temp rise. Dr Faraday invented the ring, used in every microwave today, see through window with copper screen that knocks doen the field.
Fred Specht
847-606-9462
ASM Heat Treat Book says max hardness 52-55 RC, so you are pushing the limits f the steel.
The cracking could be caused by overheating, the word melting indicates you may be overheating. Overheating will cause cracking. Depending on how much sulfer is in the bar, and if it has any stringers of...
