Peening

TL;DR: Low energy laser shock peening without coating (LSPwC) was conducted on AISI 304 austenitic stainless steel specimens with varying pulse densities or overlapping as discussed by the authors, and the highest magnitude of compressive residual stress (CRS) was achieved for an optimized pulse density of 2500 pulses/cm 2 (75% overlapping).

TL;DR: In this paper, the effect of an absorbent overlay on the residual stress field using this LSP setup and this energy level was evaluated and it was observed that the overlay makes the compressive residual stress profile move to the surface.

TL;DR: In this article, a computational strategy is developed to characterize the driving force for fatigue crack nucleation at subsurface primary inclusions in carburized and shot peened C61® martensitic gear steels.

TL;DR: In this paper, the influence of carbide distribution, inclusion contents and the surface machining process on the fatigue properties of tool steels and high speed steels was investigated, and the staircase method was used to determine the fatigue strength corresponding to a life of two million cycles.

TL;DR: In this article, the extent of residual stress relaxation in turbine disc material Udimet 720Li was measured using laboratory X-rays with the sin2ψ technique, for fatigue samples as a function of temperature and number of fatigue cycles for strain controlled loading to 1.2%.