Journal
VACUUM
Volume 187, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.vacuum.2021.110136
Keywords
Severe shot peening; Gradient nanostructure; Hastelloy X; Residual stress
Funding
- Natural Science Foundation of Anhui Provincial Education Department [KJ2020A0343]
- Scientific Research Starting Foundation of Anhui Polytechnic University of China [2020YQQ009]
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Severe shot peening on nickel-based Hastelloy X alloy induced high compressive residual stress, generating a gradient nanostructure layer and significantly increasing surface microhardness.
In this study, severe shot peening (SSP) was performed on the nickel-based Hastelloy X alloy. The effects of SSP treatment on surface properties such as surface topography, microstructure, residual stress and microhardness were investigated by electron microscopy, X-ray diffraction and micro-indentation measurements. The results indicated that SSP induced a high level of compressive residual stress in the surface layer of Hastelloy X. The maximum compressive stress obtained at 125 ?m deep was more than 1200 MPa after SSP, and the total depth of the compressed region was -700 ?m, which was nearly two times thicker than the conventionally shot-peened sample. Due to the ultra-high plastic deformation imparting on the material?s surface, a gradient nanostructure layer with an average grain size of -50 nm in the topmost surface was generated after SSP treatment. The grain refinement caused by severe plastic deformation was mainly attributed to the dislocation activities and deformation twins. As a result of the formation of nano-grains, high-density dislocations and deformation twins, the surface microhardness of the SSP sample was significantly increased, which was -2.2 times higher than that of base material.
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