Structural and magnetic transition in stainless steel Fe-21Cr-6Ni-9Mn up to 250 GPa

Stainless steel Fe-21Cr-6Ni-9Mn （SS 21-6-9）, with ~21% Cr, ,~6% Ni, and ~ 9% Mn in weight percentage, has wide applications in extensive fields. In the present study, SS 21-6-9 is compressed up to 250 GPa, and its crystal structures and compressive behaviors are investigated simultaneously using the...

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Published in:Chinese physics B 2015-06, Vol.24 (6), p.451-456
Main Author: 柳雷 侯琪玥 张毅 敬秋民 王志刚 毕延 徐济安 李晓东 李延春 刘景
Format: Article
Language:English
Subjects:
Anisotropy
Austenitic stainless steels
Chromium
Close packed lattices
Collapse
Density
HCP
Hexagonal cells
Nickel
Stainless steels
x射线衍射技术
不锈钢
压缩行为
密排六方结构
晶体结构
重量百分比
非磁性
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Summary:Stainless steel Fe-21Cr-6Ni-9Mn （SS 21-6-9）, with ~21% Cr, ,~6% Ni, and ~ 9% Mn in weight percentage, has wide applications in extensive fields. In the present study, SS 21-6-9 is compressed up to 250 GPa, and its crystal structures and compressive behaviors are investigated simultaneously using the synchrotron angle-dispersive x-ray diffraction technique. The SS 21-6-9 undergoes a structural phase transition from fcc to hcp structure at ~ 12.8 GPa with neglectable volume collapse within the determination error under the quasi-hydrostatic environment. The hcp structure remains stable up to the highest pressure of 250 GPa in the present experiments. The antiferromagnetic-to-nonmagnetic state transition of hcp SS 21-6-9 with the changes of inconspicuous density and structure, is discovered at ~50 GPa, and revealed by the significant change in c/a ratio. The hcp SS-21-6-9 is compressive anisotropic： it is more compressive in the c-axis direction than in the a-axis direction. Both the equations of states （EOSs） of fcc and hcp SS 21-6-9, which are in accordance with those of fcc and hcp pure irons respectively, are also presented. Furthermore, the c/a ratio of hcp SS 21-6-9 at infinite compression, R∞, is consistent with the values of pure iron and Fe-10Ni alloy.
ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/24/6/066103