rèn nguội

Người thợ đang rèn nguội một thanh kim loại trên đe.

Definition

1. Verb (Technical/Metallurgy):
   • To cold-work / to cold-forge: The process of shaping or hardening metal by hammering, pressing, or bending it at or near room temperature, below its recrystallization point. This increases the metal's strength and hardness through strain hardening (work hardening).

Usage Examples

• Verb:
  • Người thợ rèn nguội miếng sắt để tăng độ cứng. (The artisan cold-worked the iron piece to increase its hardness.)
  • Phương pháp rèn nguội thường được dùng trong sản xuất đồ trang sức. (The cold-forging method is often used in jewelry production.)
  • Không nên rèn nguội loại thép này vì nó có thể bị nứt. (This type of steel should not be cold-worked because it may crack.)

Advanced Usage

• The term is primarily used in technical, industrial, and crafting contexts related to metalworking.
• The result of is écrouissage (French) or strain hardening, where the metal's crystalline structure is deformed, making it stronger but less ductile.

Variants and Related Words

• Rèn (v): to forge (generally, often involving heat).
• Gia công nguội (v): cold working (a broader technical term).
• Dập nguội (v): cold stamping or cold pressing (a specific type of cold-working).

Synonyms

• To cold-work: The general technical term.
• To cold-forge: Specifically implies a forging/hammering action.
• To work-harden: To describe the effect of the cold-working process.

Related Technical Terms

• Ủ (Annealing): A heat treatment process that softens metal hardened by cold-working, often contrasted with .
• Dẻo dai (Ductility): A property that is reduced by the cold-working process.