Case Hardening or Surface Hardening. A short summary of this paper. ... remain close to the surface temperature that prevents This paper. 3 surface hardening 1. hardenin surface. Laser surface hardening (LSH) is one of the most widely used surface hardening process which can be applied to almost the whole range of metallic materials in today's applications. 50 mm, depending on focusing and process control. SURFACE HARDENING or CASE HARDENING 2. introduction Case hardening or surface hardening is the process of hardening the surface of a metal, thus forming a thin layer of harder metal (called the "case") at the surface. The laser spot covers a track width of 1 to approx. The basic process used is thermo- chemical, because some heat is needed to en- hance the diffusion of hardening species into the surface and subsurface regions of a part. Process depends on presence of CO 2C + O 2 2 CO At surface, releases C atoms 2CO CO2 + C C dissolved interstitially at surface of steel. Case hardening is usually done after the part has been formed into its final shape. Surface Hardening Processes - Free download as Powerpoint Presentation (.ppt), PDF File (.pdf), Text File (.txt) or view presentation slides online. It is the process of carburisation i.e., saturating the surface layer of steel with carbon, or some other process by which case is hardened and the core remains soft. Download Full PDF Package. With laser hardening, the surface is heated by a laser beam and quenched by heat dissipation in the workpiece (self quenching)! The size and shape of the burner largely Flame hardening is a surface hardening process to depend upon the curvature of the part being hardened. Title: FAQ- Processes for Surface Hardening Stainless Steels Author: Bodycote S³P | s3p@bodycote.com Subject: S³P treatments are low-temperature diffusion processes that greatly improve the mechanical properties of corrosion-resistant materials. 29 Full PDFs related to this paper. process involves a complex combination of elec-tromagnetic and heat transfer phenomena, as described in more detail in the article “Principles ... For this reason surface hardening can improve part performance with these two load cases, because it increases the strength at the sur- 8. Methods of hardening by diffusion include several variations of hardening species (such as carbon, nitrogen, or boron) and of the process method used to handle and transport the hardening species to the surface of the part. Process methods for exposure involve the handling of hardening species in forms such as gas, liquid, or ions. The process of heat treating is ... expense of others; for example, hardening a metal may make it brittle. 8.1 Purpose of Case Hardening As previously mentioned, surface hardening by diffusion involves the chemical modification of a surface. Surface Hardening of Steels: Understanding the Basics J. R. Davis , J. R. Davis A practical selection guide to help engineers and technicians choose the most efficient surface hardening techniques that offer consistent and repeatable results. The depth of diffusion exhibits a time-temperature dependence such that: The main aim of this process is to make the only external surface of steel hard and inner core soft.