合金添加剂Si和Ti对316不锈钢辐照肿胀作用的研究

THE EFFECT OF ALLOY ADDITIVE Si AND Ti ON RADIATION SWELLING OF STAINLESS STEEL

用ＨＶＥＭ在１ＭｅＶ和５５０℃下原位研究了Ｓｉ和Ｔｉ对３１６不锈钢辐照肿胀的影响．含１％Ｓｉ的３１６钢在辐照剂量≤１１ｄｐａ时和含０．１％Ｔｉ的一样，能强烈抑制辐照肿胀。但在＞１１ｄｐａ后，含１％Ｓｉ的３１６钢肿胀率远大于未含添加剂的对比钢样品，含０．５％Ｔｉ能完全抑制辐照空洞产生，但诱导了Ｔｉ析出物，１％Ｓｉ和０．１％Ｔｉ的联合作用，也能完全抑制辐照空洞产生，但同样有少量Ｔｉ析出物。

The effect of minor additive St or Ti, as well as both Si and Ti on behavior of radiation swelling for 316 stainless steel alloy(316 SS), irradiated at 550℃, using high voltage electron microscope(HVEM) with 1MeV electron beam was studied, and the swelling morphology was observed in situ under HVEM.Silicon(1 wt% ), as well as Ti(0 .1 wt% ) can inhibit radiation swelling when the dose is not more than 11dpa. The 316 SS bearing 1 wt% St additive has even larger swelling rate than that of the alloy without any additive, when dose is more than 13 dpa. 0.5 wt% Ti additive can even completely prevent it from swelling under the dose up to 33 dpa, but there are some small Ti compound particles segregated on radiation area. Experimental results show that the synergistic effect of both Si and Ti can completely prevent 316 alloys from swelling under radiation dose up to 33 dpa, but there are also a little Ti compound particles segregated on the circle of central area, but the number and size of the particles increase slightly with the dose.