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2. Spring steel - Wikipedia

   en.wikipedia.org/wiki/Spring_steel

   Spring steel is a name given to a wide range of steels [1] used in the manufacture of different products, including swords, saw blades, springs and many more. These steels are generally low-alloy manganese , medium-carbon steel or high-carbon steel with a very high yield strength .

3. List of blade materials - Wikipedia

   en.wikipedia.org/wiki/List_of_blade_materials

   5160, a spring steel. Popular steel for forging swords and large knives, with high toughness and good wear resistance. [citation needed] Popular sword manufacturers that use 5160 spring steel include Hanwei and Generation 2. [citation needed] 5160 spring steel is mainly used on Medieval type swords. [citation needed] 4140 [definition needed]

4. Differential heat treatment - Wikipedia

   en.wikipedia.org/wiki/Differential_heat_treatment

   Differential heat treatment is a method used to alter the properties of various parts of a steel object differently, producing areas that are harder or softer than others. This creates greater toughness in the parts of the object where it is needed, such as the tang or spine of a sword, but produces greater hardness at the edge or other areas ...

5. Tempering (metallurgy) - Wikipedia

   en.wikipedia.org/wiki/Tempering_(metallurgy)

   Differentially tempered steel. The various colors produced indicate the temperature the steel was heated to. Light straw indicates 204 °C (399 °F) and light blue indicates 337 °C (639 °F). [1] [2] Tempering is a process of heat treating, which is used to increase the toughness of iron-based alloys.

6. Heat treating - Wikipedia

   en.wikipedia.org/wiki/Heat_treating

   Steel castings after undergoing 12-hour 1,200 °C (2,190 °F) heat treatment. Complex heat treating schedules, or "cycles", are often devised by metallurgists to optimize an alloy's mechanical properties. In the aerospace industry, a superalloy may undergo five or more different heat treating operations to develop the desired properties.

7. Precipitation hardening - Wikipedia

   en.wikipedia.org/wiki/Precipitation_hardening

   Precipitation hardening, also called age hardening or particle hardening, is a heat treatment technique used to increase the yield strength of malleable materials, including most structural alloys of aluminium, magnesium, nickel, titanium, and some steels, stainless steels, and duplex stainless steel.