Microstructure and nanoindentation hardness of shot-peened ultrafine-grained low-alloy steel

Microstructure and nanoindentation hardness of shot-peened ultrafine-grained low-alloy steel
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喷丸超细晶低合金钢的显微组织和纳米压痕硬度

DOI:
10.1007/s42243-018-0061-z
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发表时间:
2018-05
期刊:
J. Iron Steel Res. Int.
影响因子:
--
通讯作者:
申勇峰
申勇峰
中科院分区:
其他
文献类型:
--
作者:
xiaowei Feng;申勇峰

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研究了喷丸处理对超细晶低合金钢显微组织和硬度的影响。随着喷丸时间从0.5 h增加到1.5 h,UFG低合金钢表层晶粒尺寸从400 nm减小到280 nm,而160 μm层的晶粒尺寸从(230 ± 15)nm减小到(75 ± 5)nm。有趣的是,纳米压痕显示硬度随着SP持续时间的增加而线性增加,在SP持续1.5 h后,在160 µm深度处达到高达(7.10 ± 0.1)GPa的值。SP处理层的厚度测量为约300 μm。建立了硬化层的Hall-Petch(H-P)关系。相应地,耐磨性应比制备的UFG低合金钢高约51%。如SP处理中所示,晶粒细化是负责所研究的钢的强化的关键因素。
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 μm 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 µm after the SP duration of 1.5 h. The thickness of the SP treated layer is measured as ~ 300 μm. 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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