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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 SS21-6-9 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.
Has a wide applications in extensive fields. In the present study, the stainless steel Fe-21Cr-6Ni-9Mn (SS 21-6-9) with ~ 21% Cr, ~ 6% Ni, and ~ 9% Mn in weight percentage 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. 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 SS21 -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 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. Hotmore, 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.