Conversion between Vickers hardness and nanohardness by correcting projected area with sink-in and pile-up effects

Youping LU (鲁又萍); Yue SU (苏悦); Wei GE (葛伟); Tengfei YANG (杨腾飞); Zhanfeng YAN (闫占峰); Yugang WANG (王宇钢); Songqin XIA (夏松钦)

doi:10.1088/2058-6272/ab7d47

Plasma Science and Technology > 2020 > 22(6): 65602-065602. > DOI: 10.1088/2058-6272/ab7d47

Youping LU (鲁又萍), Yue SU (苏悦), Wei GE (葛伟), Tengfei YANG (杨腾飞), Zhanfeng YAN (闫占峰), Yugang WANG (王宇钢), Songqin XIA (夏松钦). Conversion between Vickers hardness and nanohardness by correcting projected area with sink-in and pile-up effects[J]. Plasma Science and Technology, 2020, 22(6): 65602-065602. DOI: 10.1088/2058-6272/ab7d47

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Conversion between Vickers hardness and nanohardness by correcting projected area with sink-in and pile-up effects

¹ State Key Laboratory of Nuclear Physics and Technology, Center for Applied Physics and Technology, Peking University, Beijing 100871, People's Republic of China
² College of Materials Science and Engineering, Hunan University, Changsha 410082, People's Republic of China

Funds: This work was financially supported by the National Magn- etic Confinement Fusion Energy Research Project of China (No. 2015GB113000), National Natural Science Foundation of China (Nos. 11675005, 11935004), China Postdoctoral Science Foundation (No. 2018M641093) and the National Defense Nuclear Material Technology Innovation Center.

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Received Date: December 03, 2019
Revised Date: March 01, 2020
Accepted Date: March 05, 2020

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Abstract

The Vickers hardness test has been widely used for neutron-irradiated materials and nanoindentation for ion-irradiated materials. Comparing the Vickers hardness and nanohardness of the same materials quantitatively and establishing a correlation between them is meaningful. In this study, five representative materials—pure titanium (Ti), nickel (Ni), tungsten (W), 304 coarse-grained stainless steel (CG-SS) and 304 nanocrystalline austenitic stainless steel (NG-SS)—are investigated for comparison. The results show that the relationship between Vickers hardness and nanohardness does not conform to a mathematical geometric relationship because of sink-in and pile-up effects confirmed by finite element analysis (FEA) and the results of optical microscopy. Finally, one new method was developed by excluding the effects of sink-in and pile-up in materials. With this improved correction in the projected area of the Vickers hardness and nanohardness, the two kinds of hardness become identical.
- Vickers hardness,,
- nanohardness,
- conversion

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