Abstract
The article deals with the investigation of static and fatigue crack resistance of normalized steels 40Kh and 30KhGSA, and also of steel 40Kh after hardening and tempering at 500°C with the object of working out recommendations for the use of normalized steel 40Kh for making axles of tractor trailers produced at the Chelyabinsk Engineering Works. The article presents the results of static tests of cylindrical specimens with annular cracks under conditions of axial tension which showed that the crack resistance K1C of heat-treated steel 40Kh is up to 20% higher than after normalization. The crack resistance K1C of normalized steel 30KhGSA has intermediate values. We carried out fatigue tests of the above-mentioned steels by concentrated bending, and from the results we plotted kinetic diagrams of fatigue failure and determined the threshold values of the characteristics of fatigue crack resistance Kth and Kfc which confirmed the data of the static tests. It was established that normalized steel 40Kh can be recommended as material of axles for tractor trailers with a load capacity of up to 10 tons for which the safety factor Ks is at least 2–2.5.
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