Nanoindentation characterization of non-metallic inclusions in free cutting steel

WANG Yu-nan; BAO Yan-ping; WANG Min

doi:10.13374/j.issn1001-053x.2014.07.008

Volume 36 Issue 7

Jul. 2021

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WANG Yu-nan, BAO Yan-ping, WANG Min. Nanoindentation characterization of non-metallic inclusions in free cutting steel[J]. Chinese Journal of Engineering, 2014, 36(7): 903-909. doi: 10.13374/j.issn1001-053x.2014.07.008

Citation:

WANG Yu-nan, BAO Yan-ping, WANG Min. Nanoindentation characterization of non-metallic inclusions in free cutting steel[J]. Chinese Journal of Engineering, 2014, 36(7): 903-909. doi: 10.13374/j.issn1001-053x.2014.07.008

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Nanoindentation characterization of non-metallic inclusions in free cutting steel

doi: 10.13374/j.issn1001-053x.2014.07.008

WANG Yu-nan^{1,2
,
,},
BAO Yan-ping^1,2,
WANG Min³

1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China;
2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;
3. National Engineering Research Center of Flat Rolling Equipment, University of Science and Technology Beijing, Beijing 100083, China

Received Date: 2013-05-02
Available Online: 2021-07-19

Abstract

Abstract

Inclusions in free cutting steel such as BN, MnS, Al₂O₃ and TiN were characterized by nanoindentation. The improvement of BN inclusions on the machinability of the steel was discussed. The error between nanoindentation and macrohardness measurement was analyzed. The hardness of BN inclusions in as-cast samples is lower than that of MnS inclusions, but BN inclusions after forging become harder than MnS, even though these three kinds of inclusions are far softer than the based metal. BN inclusions in as-cast samples and forged samples are stress concentration sources, lubricants and enclose hard particles, therefore improve the machinability of the steel. Nanoindentation characterization and macrohardness measurement have certain error.
- free cutting steel,
- non-metallic inclusions,
- nanoindentation,
- hardness,
- cutting performance,
- boron nitride