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The influence of laser hardening on plane bending fatigue behavior (R=-1) of a B-Mn SS2131 (~AISI 15B21H) steel has been studied. Laser hardening improves the fatigue limit of Q&T smooth and notched specimens by 18 and 56%. The fatigue strength improvement depends on the fatigue life. Surface and subsurface crack initiations occur independently of the applied load level. The residual stresses...
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