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Surface Remelting of Mold Inserts Made of NC11 Steel

Trytek Andrzej, Tupaj Mirosław, Majerník Ján, Gašpár Štefan, Zbyrad-Kołodziej Wiktoria, Łysiak Karol

Journal of Casting & Materials Engineering

2020

Vol. 4, no. 1

9--15

In the study presented in this paper, the effect of a concentrated heat stream on geometry, microstructure, and hardness of superficial remeltings on NC11 steel is examined. The material is used for disposable mold inserts exposed to intensive abrasive wear in the course of the press-molding of hard aggregate stampings for refractory bricks. As a result of local remelting, the hardness of the steel surface increased and its microstructure was altered. Macro- and microstructure of the remelted areas was examined with the use of optical microscopy and measurements of remelting area geometry were carried out for different parameters of the remelting process. Hardness measurements were taken in the remelting area and in the heat-affected zone. The state of stress in the material before remelting and in the remelted area was also evaluated.

The Effect of the Heat Flux Density on Microstructure of Surface Remeltings on C355 Alloy Castings

Orłowicz A. W., Mróz M., Tupaj M., Trytek A., Jacek M., Radoń M.

Archives of Foundry Engineering

2018

Vol. 18, iss. 2

35--38

The paper presents results of a study on the effect of the flux density of heat carried away for the remelting area to substrate in the course of surface remelting with concentrated heat stream on values of structural parameters λ1D and λ2D of α(Al) phase dendrites in C355 alloy. The remeltings were made with the use of GTAW method, at arc current intensity I = 200 A and concentrated heat stream scanning speed vs = 200, 400, 600, and 800 mm/min. The used protective gas was argon supplied at rate of 20 l/min. It has been found that the increase of the rate of scanning with concentrated heat stream results in a change of the remelting-substrate separation surface shape consisting in reduction of the remelting width and depth. This increases the value of the flux density of heat transmitted from the remelting area to substrate which in turn acts in favor of reduction of structural parameters λ1D and λ2D characterizing α(Al) phase dendrites in C355 alloy.