Intro
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Lesson 02·Metallurgy
The metallurgy you actually need — Fe-N phase diagram in plain English
Epsilon vs gamma-prime, the 590°C ceiling, and what Kn = 2.5 on a vendor quote actually constrains.
7 min readLesson 2 of 12
A vendor quote for a Nitralloy 135M punch reads: "Gas nitride, Kn-controlled, Kn = 3.0 at 520°C, 30-hour cycle, γ'-dominant compound layer per AMS 2759/10 Class 1." This lesson is the minimum metallurgy required to read that line and know what it constrains.