Unveiling the origins of work-hardening enhancement and mechanical instability in laser shock peened titanium

Li, Runguang; Wang, Youkang; Xu, Ning; Yan, Zhiran; Li, Shilei; Zhang, Minghe; Almer, Jonathan D.; Ren, Yang; Wang, Yan-Dong

doi:10.1016/j.actamat.2022.117810

Unveiling the origins of work-hardening enhancement and mechanical instability in laser shock peened titanium

Journal Article · Tue Mar 01 23:00:00 EST 2022 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2022.117810· OSTI ID:1880261

^[1]; ^[2]; Xu, Ning ^[2]; ^[2]; ^[2]; ^[2]; Almer, Jonathan D. ^[3]; ^[3]; Wang, Yan-Dong ^[2]

Univ. of Science and Technology, Beijing (China); Technical Univ. of Denmark, Lyngby (Denmark)
Univ. of Science and Technology, Beijing (China)
Argonne National Lab. (ANL), Argonne, IL (United States)

Laser shock-peening (LSP) produces complex gradients in microstructures and residual stresses, which enables fabrication of metallic engineering components with superior mechanical properties. In this work, we use non-destructive and spatially resolved high-energy X-ray diffraction (HE-XRD) to investigate the influences of LSP on microstructure, surface topography, and residual stress for high purity titanium plates. LSP is found to produce large compressive in-plane residual stresses near the peened surface which monotonically decay to zero about 2.5 mm below the surface. These properties were also tracked during in-situ tensile loading, allowing stress partitioning and work-hardening rates to be measured as a function of depth. The surface region is found to have the highest work-hardening rate and remain mechanically stable up to sample failure. In addition, a crystal rigid rotation along a transversal axis of about 27 & nbsp; was observed at large applied strain near the surface region, which is attributed to the formation of denser dispersed shear bands. Furthermore, a sudden drop in tensile stress was observed at a depth of similar to 160 mu m from the LSP surface, indicating the formation of a localized mechanical instability zone (LMIZ). The origin of this LMIZ could be attributed to the increase in shear stress induced by a load transfer from LSP surface due to the formation of denser dispersed shear bands. These observations indicate a localized transition in deformation behavior has occurred from dispersed shear banding to LMIZ and homogeneous deformation.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Key Research and Development Program of China; National Natural Science Foundation of China (NSFC); Fundamental Research Funds for the Central Universities; European Research Council (ERC)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1880261

Journal Information:: Acta Materialia, Journal Name: Acta Materialia Vol. 229; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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