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| Microstructure and nanoindentation hardness of shot-peened ultrafine-grained low-alloy steel |
| Xiao-wei Feng 1 , Juan Xie 2 , Wen-ying Xue 3 , Yong-feng Shen 2 , Hong-bo Wang 1 , Zhen-yu Liu 3 |
| 1 Institute of Systems Engineering of China Academy of Engineering Physics, Mianyang 621999, Sichuan, China 2 Key Laboratory for Anisotropy and Texture of Materials (MOE), School of Materials Science and Engineering, Northeastern University, Shenyang 110819, Liaoning, China 3 The State Key Lab of Rolling and Automation, Northeastern University, Shenyang 110819, Liaoning, China |
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Abstract The effect of shot peening (SP) on microstructure and hardness of ultrafine-grained (UFG) low-alloy steel was investigated. With increasing shot-peening time from 0.5 to 1.5 h, grain size of UFG low-alloy steel decreases from 400 to 280 nm at surface whilst that of the layer with a depth of 160 lm decreases from (230 ± 15) to (75 ± 5) nm. Interestingly, nanoindentation shows that hardness increases linearly with increasing the SP duration, reaching a value as high as (7.10 ± 0.1) GPa at the depth of 160 lm after the SP duration of 1.5 h. The thickness of the SP treated layer is measured as 300 lm. The Hall–Petch (H–P) relationship was established for the hardening layer. Correspondingly, abrasion resistance should be 51% higher than that of as-prepared UFG low-alloy steel. As shown in SP processing, grain refinement is the key factor responsible for the strengthening of the studied steel.
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| Cite this article: |
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Xiao-wei Feng,Juan Xie,Wen-ying Xue, et al. Microstructure and nanoindentation hardness of shot-peened ultrafine-grained low-alloy steel[J]. Journal of Iron and Steel Research International, 2019, 26(5): 472-482.
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2019, Vol. 26 
