Cracking Mechanism of Medium-High Carbon Steel during Hardfacing and Effect of Electrode Composition

In this paper,the temperature and stress fields during hardfacing and the crack mor-phology in welded specimens were studied by using a medium-high carbon steel 60CrMnMo, and a RE-doped electrode for cracking resistance has been developed.The temperature fields on the upper surface of simulated specimens during the hardfacing and the following colding were measured by a thermovision analyzer and the residual stress fields were determined by an X-ray stress analyzer. Both these fields have been simulated by usmg the FEM. The calculated re-sults of the temperature and the residual stress fields talhed with the measured ones quite well. The calcu-lations for establishing the influence of martensite transformation temperatures of the hardfacing metal on the stress distribution m simulated specimens show that,with their lowering,the peaks of tensile residual stress at dangerous positions reduce which is considered to be benefit to avoid the occurence of hardfacing cracks.It is shown that,by adding the RE-oxi

Cracking Mechanism of Medium-High Carbon Steel during Hardfacing and Effect of Electrode Composition