EFFECT OF ε MARTENSITE ON THE DAMPING PROPERTY OF FE-(CR, AL)-MN SYSTEM ALLOYS

研究了Cr、Mn、Co、N等合金元素，形变热处理工艺，（bcc，诱导α^1期（bct）），本文研究了γ和ε对Fe-5、12%Cr-6、30%Mn-0、4%Co合金阻尼性能的影响，并开发了一种新的Fe-Cr-Mn-12%Co合金。高强度高阻尼性能钴合金。（1）Fe-12%Cr-22%Mn合金经1373 K × 1hr固溶处理后，经15 ~ 50%冷轧后，阻尼性能最好。ε相对提高Fe-12%Cr-22%Mn合金的阻尼性能有显著作用，而α、α^1和γ相对合金的阻尼性能无明显影响。(2)4%Co的加入对Fe-12%Cr-22%Mn合金的高阻尼性能是非常有效的。(3)冷轧温度和深冷处理也是提高Fe-Cr-Mn-Co合金阻尼性能的重要因素。Fe-12%Cr-22%Mn-4%Co合金在360 K下50%冷轧后，在223 K下进行低温处理，其阻尼性能最好。

In the present research, effects of (1) alloying elements of Cr, Mn, Co and N, (2) thermomechanical treatments and (3) microstructure and phases of a (bcc, inducing α^1 phase (bct)), γ and ε on the damping property of Fe-5〜12%Cr-6〜30%Mn-0〜4%Co alloys have been investigated and the present investigators have develped a new Fe-Cr-Mn-Co alloy with high strength and high damping property. Brief summaries are made as followings,(1) The highest damping property has been obtained on the Fe-12%Cr-22%Mn alloy which are cold rolled by 15 to 50% after the solution treatment at 1373K for 1hr. ε phase has a significant effect for increasing the damping property of Fe-12%Cr-22%Mn alloy, whicle α , α^1 and γ phases have no effect on the damping property of the alloy.(2) The addition of 4%Co is very effective to give the high damping property to the Fe-12%Cr-22%Mn alloy.(3) Cold rolling temperature and subzero treatment are alos important factor t for increasing damping property of Fe-Cr-Mn-Co alloys. Fe-12%Cr-22%Mn-4%Co alloy winch is 50% cold rolled at 360K and subzero treated at 223K has the highest damping property.