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M2 steel double tempering showing soften region


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M2 steel 1190 C 1 hr and 620 C double tempering for 2 hrs. Etched using 5% Ni for 3 min. Around 100 um white region with big grains at the outside of the materials, the hardness is 200 HV. The brown region hardness is 750 HV. 

What could be this soft white region with big grains?

How should I reharden it?

 

Thanks!

 

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If this is for  knife making you might try asking on some of the knife maker  forums. While it not a common steel for knifes a Google search showed some of the Blade forums guys have used it

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  • 3 weeks later...

That is probably a region of decarbuization. That happens more rapidly in this grade than many more common blade steels. You can minimize it by packing the blade in carburizing compound during austenitizing. You can grind it off too. In theory you could recarburize the are that list carbon, but it is much simpler to prevent it from the beginning. 

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