Abstract
The present study is conducted with a dual‐aim: firstly, to examine the effect of several single shot peening conditions on the subsurface layer properties and fatigue performance of the case‐hardened 18CrNiMo7‐6 steel, and secondly, to propose an optimized peening condition for improved fatigue performance. By carrying out the subsurface integrity analysis and fatigue testing, the underlying relationships among the peening process, subsurface layer property and fatigue performance are investigated, the way peening conditions affect the fatigue life and its associated scatter for the case‐hardened 18CrNiMo7‐6 steel is quantitatively assessed. The in‐depth study shows that dual peening can be an optimized solution, for it is able to produce a subsurface layer with enhanced properties and eventually gain a significant improvement in fatigue performance.
Highlights
High-strength steels are massively used in the aeronautical and automotive applications for their high-loading capacity
With the increasing demand for high reliability products, the dual properties of high strength and high ductility are expected for such steel materials to give a longer service lifetime of engineering machinery. is motivates the design of a new class of material, referred to as gradient nanostructured (GNS) high-strength steel [1]
As fatigue failures generally occur on the material surface and propagate into the interior, a structural architecture comprising a GNS subsurface region and a coarse-grained interior are considered optimal for enhanced fatigue behavior
Summary
High-strength steels are massively used in the aeronautical and automotive applications for their high-loading capacity. As fatigue failures generally occur on the material surface and propagate into the interior, a structural architecture comprising a GNS subsurface region and a coarse-grained interior are considered optimal for enhanced fatigue behavior Speaking, this is because fatigue crack initiation would be suppressed by the strong work-hardened subsurface layer of a fine-grained structure, and fatigue crack propagation would be arrested by the in-plane compressive residual stress produced by the misfit strain between the bulk and the subsurface material [2]. Despite the development of these new variants, conventional shot peening method remains one of the most important means in the industrial production due to its high flexibility and productivity, low cost, and environmental friendliness. For these reasons, shot peening process is of particular interest in the present work
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