| In recent years,in order to obtain a more excellent soft magnetic properties of Fe-based amorphous,i.e.,high saturation magnetic flux density(Bs),low coercive force(Hc),high effective permeability(?e),low core loss(Pc)and low excitation power(Ss),and reduce the production cost of Fe-based amorphous soft magnetic alloys,many effors have been made.Only adding metalloid elements in alloy steels with low cost is a new promising approach to develop new high-performance multi-component Fe-based amorphous steels.In this paper,the main alloy steels Fe92.28Cr3.75Ni1.51Co0.13Mn0.58Cu0.03Mo0.01C0.14P0.15Si1.42(at %)and Fe95.57Cr1.9Ni1.19Mn0.26Al0.06S0.02C0.05P0.14Si0.81(at %)(represented by 1# and 2# respectively)are used as the initial alloy,a series of multi-component soft-magnetic amorphous steels are developed by component substitution and constituent adjustment.And their structure and properties are systematically investigated.High performance of the multi-component soft-magnetic amorphous steels are expected to obtain by exploiting the multi-component characteristics of alloy steels.The contents of this paper mainly includs the following parts.(1)The multi-component alloys with same components(Fe-CrNiCoMnCuMoPC-SiB)but different compositions are developed by only adding metalloid elements Si and B in 1 # alloy steel,which are labeled as S1 and S2 respectively,and their structure and properties are investigated.The results indicate that S1 has the excellent comprehensive performance and amorphous forming ability,i.e.,high Bs(1.41 T),low Hc(0.742 A/m),high ?e(13550 at 1 kHz)and high frequency stability,low Pc(0.14 W/kg),low Ss(0.67 VA / kg)and favorable corrosion resistance.(2)A series of multi-component alloys are developed by single or simultaneous removing the alloying elements Cr,Ni and Co contained in the S1,which are labeled as D1~D7 respectively,and the effects of main components Cr,Ni and Co on properties of S1 are investigated systematically.The results indicate that Cr element has a significant effect on increasing its ?e and significantly reducing its Bs;In addition,Co and Ni elements have the effect on increasing the values of their Bs and ?e.(3)The structure and properties of the D1 with high density nano-scale segregation on the free-side is investigated by polishing its segregation layer of free-side.The comparison between the samples of the D1 before and after polishing its surface,the effect of segregation behavior on soft magnetic properties of D1 is detailedly researched.The results indicate that high density nano-scale segregation has the effect on increasing soft magnetic properties of Fe-based soft magnetic amorphous steels.(4)The multi-component alloys with same components(Fe-CrNiMnAlSPC-SiB)but different compositions are developed by only adding metalloid elements Si and B in 2 # alloy steel,which are labeled as M1 and M2 respectively,and then their structure and properties are investigated.The results indicate that M2 has the excellent comprehensive performance and amorphous forming ability,i.e.,high Bs(1.53 T),high ?e(14401 at 1 kHz),low Hc(1.46 A/m)and favorable corrosion resistance.(5)Three kinds of multi-component soft-magnetic amorphous steels are developed by removing the alloying elements Cr+S,Cr+S+Mn and Cr+S+Mn+Ni contained in the M2,which are labeled as K1~K3 respectively;And then four kinds of multi-component soft-magnetic amorphous steels are developed on the basis of K2 by adding the industrial pure Fe,which are labeled as K4~K7 respectively,and the effects of compositions on their properties are investigated.The results indicate that the appropriate compositions and structure of the multi-component Fe-based soft-magnetic amorphous steels are beneficial to enhance the interaction among the elements and thus improving their soft-magnetic properties and corrosion resistance;In addition,the excellent comprehensive performance of multi-component soft magnetic amorphous steel K4 is successfully developed,i.e.,high Bs(1.7 T),high ?e(7643 at 1 kHz),low Hc(2.895 A/m)and favorable corrosion resistance. |
PDF Full Text Request