Fracture behaviour of P/M Cr-V ledeburitic steel with different surface roughness

0361261 - ÚFM 2012 RIV SK eng J - Článek v odborném periodiku
Jurči, P. - Dlouhý, Ivo
Fracture behaviour of P/M Cr-V ledeburitic steel with different surface roughness.
Materiálové inžinierstvo - Materials Engineering. -, č. 18 (2011), s. 36-43. ISSN 1335-0803
Grant CEP: GA ČR GA101/09/1821
Výzkumný záměr: CEZ:AV0Z20410507
Klíčová slova: PM Cr-V ledeburitic steel * Microstructure * Surface roughness * Three point bending strength * Fractography
Kód oboru RIV: JG - Hutnictví, kovové materiály
http://fstroj.uniza.sk/journal-mi/current.html

The samples made from the Vanadis 6 PM ledeburitic tool steel were surface machined to different quality and heat treated by standard regime of the processing. Three point bending tests were carried out on processed samples. It was found that the flexural strength decreased with decreasing surface quality. The lowering of flexural strength has been accompanied with the decrease of the plastic component of plastic straining preceeding to fracture initiation (work of fracture) of the material. It indicates that the surface roughness leads to the crack initiation before a larger plastic deformation of the material can be developed. Based on the results it can be suggested that to prevent the cracking of tools in the practice it is essential to make a surfaře machining (grinding, lapping, polishing) to as high quality as possible.
Trvalý link: http://hdl.handle.net/11104/0198617