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Effects of twins and precipitates at twin boundaries on Hall–Petch relation in high nitrogen stainless steel

Published online by Cambridge University Press:  16 May 2018

Shuai Ren Open the ORCID record for Shuai Ren [Opens in a new window] ,
Zhiyan Sun ,
Zizhen Xu ,
Ruishan Xin ,
Jitan Yao ,
Da Lv  and
Jinbao Chang
Shuai Ren*
Affiliation:
HBIS GROUP Technology Research Institute, Shijiazhuang 050000, People’s Republic of China
Zhiyan Sun
Affiliation:
HBIS GROUP Technology Research Institute, Shijiazhuang 050000, People’s Republic of China
Zizhen Xu
Affiliation:
HBIS GROUP Technology Research Institute, Shijiazhuang 050000, People’s Republic of China
Ruishan Xin
Affiliation:
HBIS GROUP Technology Research Institute, Shijiazhuang 050000, People’s Republic of China
Jitan Yao
Affiliation:
HBIS GROUP Technology Research Institute, Shijiazhuang 050000, People’s Republic of China
Da Lv
Affiliation:
HBIS GROUP Technology Research Institute, Shijiazhuang 050000, People’s Republic of China
Jinbao Chang
Affiliation:
HBIS GROUP Technology Research Institute, Shijiazhuang 050000, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The microstructure evolution of high nitrogen austenitic steel wires under various annealing times and drawing temperatures was carefully characterized. Special attention was paid to the widely distributed twins and the nanoprecipitates at twin boundaries (TBs) in high nitrogen stainless steels (HNSSs). The results of microhardness indicated that the traditional Hall–Petch (H–P) equation, which only took the role of grain boundaries into account, was unsuitable. A new H–P equation that connected grain size, twin density, precipitates at TBs, and microhardness in HNSS was established for the first time and showed to be in good agreement with the experimental results. By analyzing the strained regions near TBs, a model describing the precipitation of nano-M23C6 carbides on coherent twin boundaries and incoherent twin boundaries was proposed. In addition, the influence mechanism of the nano-M23C6 at TBs on microhardness was discussed.

Keywords

grain boundariessteelhardness
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 12 , 28 June 2018 , pp. 1764 - 1772
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Copyright
Copyright © Materials Research Society 2018 

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References

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