air hardening

A blacksmith uses air hardening to cool a glowing metal blade.

Definition

1. Noun:
   • Metallurgical process: "air hardening" refers to a heat treatment process for certain types of steel or metal alloys where the material is heated to a high temperature and then allowed to cool in air, resulting in increased hardness. This process is also known as "air quenching."

Usage Examples

• Noun:
  • The steel was subjected to air hardening to achieve the desired strength. (The metal was heated and cooled in air to make it harder.)
  • Air hardening is commonly used for tool steels that require high wear resistance. (This process is applied to specific alloys to improve durability.)

Advanced Usage

• "air-hardening steel": a type of steel that hardens when cooled in air, without the need for rapid quenching in liquid.
  • The engineer specified air-hardening steel for the cutting tools. (The steel grade that becomes hard upon air cooling.)

Variants and Related Words

• Air-quenching (n): a synonym for "air hardening," emphasizing the cooling (quenching) phase in air.
  • Air-quenching is a slower process than oil or water quenching. (The cooling method uses air instead of liquids.)

Synonyms

• Air quenching: the act of cooling metal in air to harden it.
• Atmospheric hardening: a less common term for the same process.

Related Idioms

• (No common idioms directly use "air hardening," as it is a technical term.)

Phrasal Verbs

• (No phrasal verbs are associated with "air hardening.")