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研究了Fe-17.5TCr-0.5％C及Fe-17.5％Cr-0.5％C-Z％Ni(Z=1-2.4)合金的组织和磁性。在低于A_3温度退火后Fe-17.5％Cr-0.5％C合金由铁磁性的α相和M_(23)C_6相组成,合金具有高的比磁导率,好的软磁性。另一方面,当合金固溶处理后,导致有低的比磁导率的顺磁性的γ相组成。合金的比磁导率随温度降低而增加,这是由于γ相转变成磁性的α′相。在Fe-17.5Cr-0.5C合金中添加Ni降低了转变温度M_S,使顺磁性的γ相稳定化。退火Fe-17.5％Cr-0.5C％-Z％Ni合金也会导致形成铁磁性α相和M_(23)C_6相,具有软磁性,但这种软磁性稍低于Fe-17.5Cr-0.5C合金,主要是因为Fe-17.5Cr-0.5C-ZNi合金的晶粒尺寸较小。业已发现Fe-17.5Cr-0.5C-ZNi合金的软磁性能很大程度上取决于合金的残余应力。对该合金进行适合退火后,其软磁性能优于商业用Fe-18％Cr-8％Ni合金。
The microstructure and magnetic properties of Fe-17.5TCr-0.5% C and Fe-17.5% Cr-0.5% C-Z% Ni (Z = 1-2.4) alloys were investigated. The Fe-17.5% Cr-0.5% C alloy is composed of ferromagnetic α phase and M_ (23) C_6 phase after annealing below the A_3 temperature. The alloy has high specific permeability and good soft magnetic properties. On the other hand, when the alloy is solution treated, a paramagnetic gamma phase composition with a low specific permeability results. The specific magnetic permeability of the alloy increases with decreasing temperature due to the transformation of the γ phase into a magnetic α ’phase. The addition of Ni to the Fe-17.5Cr-0.5C alloy reduces the transition temperature M_S and stabilizes the paramagnetic γ phase. The annealing of Fe-17.5% Cr-0.5C% -Z% Ni alloy also results in the formation of ferromagnetic α-phase and M_ (23) C_6 phase with soft magnetic properties but slightly lower than that of Fe-17.5Cr-0.5C Alloy, mainly because Fe-17.5Cr-0.5C-ZNi alloy grain size smaller. It has been found that the soft magnetic properties of the Fe-17.5Cr-0.5C-ZNi alloy largely depend on the residual stress of the alloy. The alloy is suitable for annealing, its soft magnetic properties superior to the commercial use of Fe-18% Cr-8% Ni alloy.