材料期刊网

本文设计并研制出一种Fe-Mn-Al系无磁钢——30Mn20Al3,其合金成分(wt-％)为C0.28-0.32,Mn19-22,Al2.6-3.1,Si≤0.6。同时还研究了Al,C等元素对Fe-20Mn奥氏体稳定性、合金的力学性能等的影响。 实验结果表明,Fe-Mn合金中加入Al可抑制γ→ε及γ→ε→α′相的转变,使马氏体转变温度降低。碳稳定奥氏体的作用更为显著。 30Mn20Al3与1Cr18Ni9Ti相比较,强度与塑性均高,奥氏体稳定性亦大,磁导率低而电阻率高。其成本则只为1Cr18Ni9Ti的1/3左右,且资源丰富,具有发展为实用钢种的价值。可代替1Cr18Ni9Ti、铝合金等作为无磁钢及低温钢用于电气工业和低温工程中。

A study was made of the development of a cheaper and more satisfactory non-magnetic steel 30Mn20Al3 after consideration of the stable austenitie structure for Fe-Mn-A1 series. The effects of A1 and C contents on the stability of Fe-20Mn austenite and the mechanical properties of the alloy have been investigated. Results show that an addition of A1 to Fe-Mn alloy may restrain the transformation of γ→ε and γ→ε→α', and reduce the martensitic transition temperature. The action of C on austenite stabilization may be more obvious, As compared with the wellknown austenitie stainless steel 1Cr18Ni9Ti, the steel 30Mn20A13 exhibited superior strength, plasticity, austenite stability, magnetic permeability and resistivity, as well as more satisfactory low temperature properties. Based upon the abovementioned, it is recommended that the steel 30Mn20A13 seems to be available for nonmagnetic and cryogenic uses even down to -196℃. In additional, its production costs may be reduced to such extent about 1/3 of that for 1Cr18Ni9Ti.