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National Repository of Grey Literature 1 records found  Search took 0.00 seconds. 
Influence of surface hardening on fracture behaviour of steels
 Dlouhý, Ivo ; Chlup, Zdeněk ; Hadraba, Hynek
The paper is focused on the phenomena associated with fracture in surfaře layer produced by three different procedures. Standard cementing, nitriding and surface hardening were applied onto surfaces of six low alloy structural steels. For fracture behaviour evaluation Charpy type specimen with U notch were applied the surface of the notch radius was hardened too. The samples were loaded by means of an instrumented impact pendulum. The evaluation and classification of different fracture behaviour modes have been based on evaluation of load . flexure tracen supported by fractographic analysis. Knowledge obtained were summarised into general schematics of failure modes. As the most detrimental for the fracture resistance the surface cementing was found. The surface hardening showed the minimal negative effect on crack initiation and relatively small fracture resistence decrease.
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