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Home / News / Knowledge / The Secrets of Blades Under Microscope- Microstructure of Traditionally Forged Blade Blanks

Home / News / Knowledge / The Secrets of Blades Under Microscope- Microstructure of Traditionally Forged Blade Blanks

The Secrets of Blades Under Microscope- Microstructure of Traditionally Forged Blade Blanks

Blade Blank Microstructure Overview

Beneath the sharp edges of traditionally forged knives lie hidden changes in metallographic structures. With proper specimen preparation and microscopic inspection, we can fully figure out the merits and flaws of classic forging techniques.

Inclusions and Oxides

Metallographic views show obvious slag inclusions from embedded scale layers and high-temperature induced decarburization zones at folded forging joints. These parts cannot form hard martensite after quenching, only ductile pearlite is obtained instead.

Clear structural gradients exist from blade spine to cutting edge.

Microstructure Gradient Area A
Microstructure Gradient Area B
  • The spine adopts normalized pearlite with great toughness and low hardness.
  • The transition zone presents mixed pearlite and martensite, caused by inadequate quenching cooling rate and oxidative decarburization during folding forging.
  • The cutting edge, which is supposed to gain high hardness via full martensite structure, suffers broken material continuity due to inclusions. These weak points easily lead to stress concentration and potential service failure.
Detailed Martensite/Pearlite Structure
The tiny microscopic world interprets the core rule of "Process-Structure-Performance". Metallographic analysis bridges traditional forging art and modern material science, making ancient forging craftsmanship shine brighter than ever.
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