case hardening is a widely employed technique that enhances the durability and strength of metals. This process involves altering the surface layer of a metal to create a hardened “case” while maintaining a relatively softer core. In this article, we will delve into the intricacies of case hardening, exploring its purpose, methods, applicable metals, and various applications.
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Surface hardening, also known as case-hardening, is a technique used to make the outer layer of a metal object harder while keeping the inner layer softer. This results in the formation of a thin, tough layer on the surface.
When dealing with iron or steel that has low carbon content and lacks inherent hardenability, the case-hardening process involves introducing additional carbon or nitrogen into the surface layer. Typically, case-hardening is performed after the object has been shaped into its final form, although it can also be applied to increase the hardening element content in bars intended for pattern welding or similar processes.
Case hardening is a heat treatment process that aims to increase the hardness and wear resistance of metals. By selectively hardening the outer layer of a metal, it becomes more resistant to abrasion, impact, and fatigue, while the core retains its toughness and ductility.
The primary objective of case hardening is to enhance the mechanical properties of metals, making them suitable for demanding applications. By increasing the surface hardness, case hardening improves the metal’s resistance to wear, corrosion, and deformation. This process is particularly beneficial for components subjected to high stress, such as gears, bearings, shafts, and tools.
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