Why Quenching Makes Steel Hard
What happens when you heat it and cool it fast
0:59 · 720p · With AI narration and captions. This sample was made with the same system as this service.
Narration (full text)
Click a time to play from that scene.
Quenching Hardens Steel
The steel in blades and tools is hardened by quenching. Let's see why, by looking at how its atoms are arranged.
Steel = Iron + Carbon
Steel is iron with a little carbon mixed in. In ordinary steel, the iron atoms are neatly arranged.
Heat It Red-Hot
When it is heated red-hot, above about 800 degrees Celsius, the arrangement of the iron atoms changes, and carbon dissolves into the iron.
Cool It Fast in Water
Cool it suddenly in water or oil, and the carbon has no time to escape. It stays trapped, and the arrangement becomes distorted.
Hard but Brittle
This distorted structure is called martensite. It is very hard, but also brittle.
Tougher by Tempering
So the steel is heated again to a moderate temperature, called tempering, to regain toughness before it becomes blades and tools.
Fast Cooling Traps Carbon
Trapping carbon by cooling quickly is the secret of quenching, which makes steel hard.
Create 3D explainer videos like this sample from your documents and chat
Just attach product documents, drawings, or CAD data and tell the AI in chat what video you want. The AI plans the storyboard, builds the 3D scenes, and turns it into a video with narration and captions. You pay only for what you use (a rough guide is about 3,500 credits for a 1-minute video with 2 small revisions).
Closest use cases for this sample: Training and manuals, Manufacturing and factories
