Fracture characteristics of the Cr-V ledeburitic steel Vanadis 6
Prelomne značilnosti ledeburitnega Cr-V-jekla Vanadis 6

english

2010

volume 44, issue 2

Inštitut za kovinske materiale in tehnologije
(Obvezni izvod spletne publikacije)

The P/M Vanadis 6 is a very popular tool steel used for different cold work applications. The specimens for the three point bending tests and fracture toughness test were austenitized at two different temperatures, quenched with or without the sub-zero treatment and then double tempered. The bending strength was lower by higher austenitizing temperature and also with the use of sub-zero treatment. The average fracture toughness was lower by higher austenitizing temperature also and increased slightly with the sub-zero treatment. The lowering of bending strength can be considered as logical result because of the austenitic grain growth, as well as increased internal stresses in the case of sub-zero processed samples. For fracture toughness, the situation seems to be more complex. On one side, the effect of austenitizing temperature on fracture toughness is similar as for bending strength, on the other side, the sub-zero treatment induces a rather slight increase of fracture toughness. The paper presents some details on the experiments performed including possible explanation of the material's behaviour considering microstructure investigations.

30.01.2012