Original scientific paper

Resistivity during cycle loading of fine grain heat affected zone (HAZ) of 17CrNiMo7 steel prepared into laboratory furnace

F. Smaili ; University of Maribor, Faculty of Mechanical Engineering, Slovenia
T. Vuherer ; University of Maribor, Faculty of Mechanical Engineering, Slovenia
I. Samardžić ; Josip Juraj Strossmayer University of Osijek, Mechanical Engineering Faculty in Slavonski Brod, Croatia

Abstract

Structural components which are loaded in cyclic load mostly fail due to fatigue. The fatigue strength of metals as well as weld joint regions in metals depends on mechanical properties especially hardness, the size of defect and the size of grains. Resistivity of the fine grain HAZ prepared against fatigue crack initiation will be explained in this article. Samples of material with martensitic fine grain microstructure were prepared by laboratory furnace by proper thermal treatment. Mechanical properties of fine grain heat affected zone and its microstructure were investigated. Special attention was given to behavior of fine grain during the cycle loading under stress concentration. Stress concentration was similar to the one in real welds. The S-N curve and the fatigue limit were determined. The Paris curve and the threshold for crack propagating were also determined.

Keywords

17CrNiMo7 steel; fine grain HAZ; microstructure; mechanical properties; fatigue limit

Hrčak ID:

206503

URI

https://hrcak.srce.hr/206503

Publication date:

1.1.2019.

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