Development of Advanced Steels for Irradiation Environment

1. 316不锈钢经电子辐照后，层错位错环形核，最后在位错环内部形成空位型层错四面体。在电子/He双重辐照下，这些SFT充当了空穴成核的位置. Fe-（15-16）% Cr-16% Mn-O. 2% C-O. 2% N钢的室温屈服应力为400 MPa，延伸率为60%。这些高Mn钢在辐照下表现出优异的耐辐照性能.当含有W和V的Fe-Cr-Mn（W，V）钢经过辐照后，没有发现偏析，因此建议通过添加W和V来减缓偏析。4.含W和V的Fe-Cr-Mn合金在625 K时具有较高的抗辐照性能，但在较高温度下会有大量的小空洞形核.在Fe-Cr-Mn钢中，晶界偏析比含W钢大V.6.lt并且对于Fe-（13-16）Cr-（13-16）Mn钢，（6.5-24.5）锰-（0.02-0.2）C-0.2 N钢，（a）通过控制Cr、C、N的成分，即使对于较低Mn浓度的钢，也可以获得奥氏体的单相，（B）Fe-（15-16）wt% Cr-15.5wt % Mn-（0.02 - 0.2）wt% C-0.2wt %N钢在473- 673 K的辐照下具有优异的力学性能，（c）Fe-16 wt % Cr-15.5wt % Mn-O. 2 wt % C-O. 2 wt % N钢在473- 673 K的辐照下具有良好的抗空洞形成性能。

1. When 316 stainless steel was electron-irradiated, stacking fault dislocation loops were nucleated, and then finally stacking fault tetrahedra of vacancy type (SFT) were nucleated inside the loops. These SFTs acted as void nucleation sites under electron/He dual irradiation.2. Fe-(15-16)% Cr-16% Mn-O.2% C-O.2% N steels have yield stress of 400 MPa and the elongation of 60% at room temperature. These high Mn steels showed excellent irradiation-resistance under irradiation.3. When Fe-Cr-Mn(W,V) steels with W and V were irradiated, no segregation was recognized, and then it was suggested that by adding W, and V segregation is retarded.4. The same Fe-Cr-Mn containing W and V showed higher resistance for irradiation at625K but at higher temperature a lot of small voids were nucleated.5. In Fe-Cr-Mn steels the segregation at grain boundary was larger than the steel with W and V.6.lt was clarified for Fe-(13-16) Cr-(6.5-24.5) Mn-(0.02-0.2)C-0.2 N steels that (a) by contorolling the composition of Cr, C,N single phase of austenite can be obtained even for lower Mn concentration steels, (b)Fe-(15-16)wt% Cr-15.5wt% Mn-(O.02-O.2)wt% C-0.2wt% N steels have excellent mechanical properties, and (c) voids formation were perfectly retarded for Fe-l6wt% Cr-15.5wt% Mn-O.2wt% C-O.2wt% N steel under irradiation at 473-673K.