Unprecedented strength in pure iron via high-pressure induced nanotwinned martensite

Unprecedented strength in pure iron via high-pressure induced nanotwinned martensite

Martensitic transformation can easily induce a maximum hardness value of 800–900 HV (Vickers hardness) for steels with carbon contents of 0.6 wt.% and above. However, the occurrence of martensitic transformation in pure iron requires exceptionally high cooling rates (105–106°C/s), and the maximum ac...

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Bibliographic Details
Main Authors: Hongwang Zhang, Yuhui Wang, Yan Peng, Pinwen Zhu, Jianhua Liu, Zongqiang Feng, Guilin Wu, Xiaoxu Huang
Format: Article
Language:English
Published: Taylor & Francis Group 2019-09-01
Series:Materials Research Letters
Subjects:
Martensitic transformation
strength
pure iron
nanotwinned martensite
high pressure
Online Access:http://dx.doi.org/10.1080/21663831.2019.1612792
Description
Summary:Martensitic transformation can easily induce a maximum hardness value of 800–900 HV (Vickers hardness) for steels with carbon contents of 0.6 wt.% and above. However, the occurrence of martensitic transformation in pure iron requires exceptionally high cooling rates (105–106°C/s), and the maximum achievable hardness is only about 150 HV. Here we report an extreme hardness of 830 HV in pure iron obtained through high pressure induced martensitic transformation at a rather slow cooling rate of just 10°C/s. This unprecedented strength originates from the formation of twin-related martensitic laths with an average thickness of 3.8 nm.
ISSN:2166-3831

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