Influence of the microstructure and loads on tribological properties of G155CrNiMo4-3-3 cast steel
Journal Title: Archiwum Odlewnictwa - Year 2010, Vol 10, Issue 3
Abstract
Materials for mill rolls, fulfilling high requirements due to difficult exploitation conditions, are cast steels of adamite grade. Those are cast steels of pearlitic matrix with uniformly distributed cementite precipitations (e.g. hypereutectoid). In respect of a microstructure and a chemical composition these steels are hypereutectoid steels. They contain chromium (app. 1 %) and nickel (app. 0.5 %) and sometimes have an increased content of silica. Admissible is also a content of Mo (app. 0.4 %). An uniformly distributed carbide phase can be obtained by the proper heat treatment. The determination of the heat treatment influence on tribological properties - in dependence of the applied load - of adamite hypereutectoid G155CrNiMo4-3-3 cast steel, used for mill rolls - was the aim of the hereby paper. The purpose of the applied heat treatment was to change the hypereutectoid cementite morphology. Tribological tests were carried out at a room temperature by means of the T-05 tester, at loads of: 50, 100 and 150 N. Bearing steel 100Cr6 of a hardness 57 HRC was used as a counter sample. Testing time was 400 seconds. During the test the abrasion products were being removed from the counter sample. The performed investigations allow to draw conclusions regarding the influence of the hypereutectoid cementite morphology and loads on a wear mechanism and intensity of wearing of hypereutectoid adamite cast steel.
Authors and Affiliations
J. Krawczyk
Keywords
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