PHASE-STABILITY OF A MANGANESE-STABILIZED LOW-ACTIVATION MARTENSITIC STEEL

[摘要] The development of alloys with reduced long-life radioactivity has been incorporated into the goals of fusion materials development. One possible candidate alloy is an Fe-12Cr-6.5Mn-1W-0.3V-0.1C stabilized martensitic steel. The phase stability of this steel has been investigated following neutron irradiation over a temperature range of 420 to 600-degrees-C to doses as high as 100 dpa. The microstructural response of the irradiated steel has been compared to that of the same alloy aged for 10 000 h from 365 to 600-degrees-C. M23C6 was the only carbide found in both the aged and irradiated structures. In the samples aged at 420 and 520-degrees-C, and the samples irradiated at 520-degrees-C, an Fe-Cr-Mn-W chi-phase formed. In the samples irradiated at 420-degrees-C, alpha prime formed. The presence of chi-phase in both the thermally aged and neutron irradiated steels indicates that the Fe-Cr-Mn system is prone to intermetallic phase formation so that careful study of the effects of alloying are needed.

[发布日期] 1991-03-01

[效力级别]  Proceedings Paper