I have an crank forged from 8620 that gets normalized prior to a rough machine, then carburized for case and finsh ground. Why is it recommended to normalize the part above the temperature of the subsequent carburizing temp ? I have a reference from the ASM handbook Vol 4 "Heat treating" that...
What might cause a significant reduction in the ductility of ZA-8 diecasting ? We have noticed a significant reduction in ductility that results in cracking during a staking operation. The chemistry looks good with very low lead, cadmium and tin. The castings are water quenched and there does...
I'm looking for references/information on the impact of non-metallic inclusions on maintaining a hermetic seal. We recently began developing very small leaks in steel fittings (1018)...they are detected after assembly during a helium leak check....post bubble chamber testing shows very slow...
I have a stainless 316L fitting that is friction welded w/ recent welds not passing pressure testing. No supllier change and no process change but noticed that shipment of new fitting (fitting that wont pass pressure test after weld)is slightly magnetic relative to old fittings. I suspect some...
Thanks for the info. If the nitrides are causing a functional decrease in the mechanical properties of this spring is it possible to eliminate the nitrogen gas in the AOD process and stick w/ just argon (or does N play some other role in 17-7 PH, I never see N levels specified in the comp.)It...
I'm seeing fatigue failure in a wave spring made of 17-7 PH in the CH-900 condition. I see what I think are an excessive number of inclusions (Al nitirde as elongated clusters ~ 100 microns, ~ 5 microns individual). What would the expectation be in terms of inclusions in a 17-7 PH ?? I would...
