TwinTurbo.NET: Nissan 300ZX forum - SEM is a good idea, I will try to get that done here too.
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Subject SEM is a good idea, I will try to get that done here too.
     
Posted by itsa300zx on March 10, 2017 at 1:18 PM
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In Reply To Re: Would a difference of 16 HV be in the noise? posted by Kvert on March 10, 2017 at 12:32 PM
     
Message Although, just because there is Nitrogen present, doesn't mean that the steel is hard; its also about the heat treatment/cooling rate of the steel and the micro structure formed. Looking at the base core material, it shows an abundance of carbon(pearlite matrix formed during slow cooling).
If this crank was cooled below the critical transformation line the hardness would be well above 600HV.

     
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