Alloy steels case-hardening

Case Hardening by Surface Deformation. When a metaUic material is plastically deformed at sufficiently low temperature, eg, room temperature for most metals and alloys, it becomes harder. Thus one method to produce a hard case on a metallic component is to plastically deform the surface region. This can be accomplished by a number of methods, such as by forcing a hardened rounded point onto the surface as it is moved. A common method is to impinge upon the surface fine hard particles such as hardened steel spheres (shot) at high velocity. This process is called shot... 

Various iron nitrides and carbonitrides are formed during case hardening of steels and alloyed steels. " These iron nitrides are hard, highly wear resistant and usually do not lead to dimensional changes in the case-hardened items. 

Of the very many individual steels in this group, only a few have been examined in detail and procedures for these are given, but others can be treated as C-Mn steels or as fully hardened alloy steels (see later in this chapter). In either case the presence of boron should be noted because it makes the steel more hardenable, even... 

Diffusion layers of transition metal nitrides are (similar to case hardened steels, which should not be discussed here) prepared by heating metals and alloys in nitrogen or ammonia, occasionally diluted with an inert gas. Mainly titanium and... 

Hardened steels and tempered alloys Case-hardened steels... 

The case-hardening alloy steels may be divided into two classes high- and medium-... 

Type Non-alloyed mold steel Corrosion resistant case hardening steel Corrosion resistant heat treated stainless steel Standard case hardening steel Heat treated mold steel... 

Type Heat treated mold steel Standard hot working Highly alloyed chrome Special case hardening Special through hardening... 

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