Abstract
Surface damages caused by markings, like laser marking and mechanical marking are detrimental to the fatigue performance of the components. To improve the fatigue performance of laser marked or mechanical marked Ti-6Al-4V alloy, ultrasonic surface rolling process (USRP) was performed on Ti-6Al-4V alloy prior to marking. The results showed that laser marking induced a porous and loose oxidized layer which severely decreased the fatigue performance of the substrate. And the mechanical marking slightly decreased the fatigue performance of the substrate due to the local stress concentration at the bottom of the pits. After USRP pretreatment, the detrimental effect of laser marking on the fatigue performance of the substrate was eliminated while the fatigue performance of mechanical marking sample was significantly improved by a factor of 3. That was because the USRP-induced residual compressive stress suppressed the crack early propagation. Key words: Titanium alloy; Fatigue; Ultrasonic surface rolling process; Surface damage; Residual compressive stress; Laser marking, Mechanical marking
Highlights
Data matrix (DM) codes have been widely used in the adver sing, internet, electronic cket business and industry due to its small area, large amounts of informa on, high reliability, high error-correc ng ability and high security [1,2,3]
The specimens were subjected to ultrasonic surface rolling process (USRP) under a sta c force of 900N using a rota on speed of 200 rev/min and the feeding rate is 0.10 mm/rev
A minimum of two samples were tested for base material (BM), laser marked sample (LM), USRP-laser marked sample (USRP-LM), mechanical marked sample (MM) and USRP-mechanical marked sample (USRP-MM)
Summary
Data matrix (DM) codes have been widely used in the adver sing, internet, electronic cket business and industry due to its small area, large amounts of informa on, high reliability, high error-correc ng ability and high security [1,2,3]. Laser marking produces permanent, high contrast codes rapidly with rela vely low cost [3]. The laser marking causes a large surface damage on the substrate which is not conducive to its fa gue proper es. Mechanical marking could produce a permanent code with rela vely small surface damage on the substrate. It is necessary to inves gate the fa gue performance of surface-damaged tanium alloy. It is proposed that USRP treatment could be performed prior to laser marking or mechanical marking to improve the fa gue performance. The fa gue performance of the base material (BM), laser marked sample (LM), USRP-laser marked sample (USRP-LM), mechanical marked sample (MM) and USRP-mechanical marked sample (USRP-MM) is inves gated
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