Sovereignty Module: Know the Steel

Complete Metallurgy and Heat Treatment Science: From Iron Atoms to Hardened Blades

Understanding metallurgy transforms the blacksmith from a craftsperson into a scientist. This campaign covers the iron-carbon phase diagram, crystal structures, heat treatment theory, and practical application.

Chapter 1: Iron-Carbon System

Chapter 2: Steel Classification

Chapter 3: Heat Treatment Processes

Chapter 4: Quenching Media

Chapter 5: Tempering Colors

Reference Card

1. Carbon is the key to hardening (pure iron cannot be hardened by quenching; carbon dissolved in the iron crystal structure enables the formation of martensite, the hard phase that makes steel useful for cutting tools). 2. The critical temperature is the transformation point (above the critical temperature, steel transforms to austenite; quenching from this temperature traps carbon in the crystal structure, creating martensite). 3. Quenching creates hardness, tempering creates toughness (as-quenched martensite is hard but brittle; tempering at 300-600°F reduces brittleness while retaining useful hardness; always temper after hardening). 4. Tempering colors are a practical guide (the oxide colors that form on polished steel at specific temperatures have guided blacksmiths for centuries; straw for knives, purple for springs, blue for soft springs). 5. Grain size affects performance (coarse grain is weak; fine grain is strong; normalizing refines grain structure; never overheat steel, as it causes grain growth that weakens the metal). 6. Each steel has its own requirements (1095 needs water quench; O1 needs oil quench; D2 needs air quench; using the wrong quench medium can crack the steel or fail to harden it). 7. Differential hardening creates the best blades (a blade with a hard edge and a soft spine combines cutting ability with flexibility; Japanese swordsmiths perfected this technique with clay-coated differential quenching). 8. Metallurgy is the science behind the craft (understanding why steel behaves as it does transforms the blacksmith from someone who follows recipes into someone who can solve problems and innovate).