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对不同Re和W含量的铸态镍基单晶高温合金通过Brinell硬度计压痕变形,分别在1230~1330℃保温1 h,研究了难熔元素Re和W对合金再结晶行为的影响.结果表明,再结晶晶粒在压痕表面形成,并沿枝晶干向内扩展,晶界迁移受到枝晶间粗大g’相和g+g’共晶阻碍.添加Re和W提高了铸态单晶高温合金的g’相溶解温度和g+g’共晶含量,导致单晶高温合金的再结晶温度升高.热处理温度升高,各单晶高温合金的再结晶面积随着枝晶间g’相和共晶含量的减少而增大.相同热处理温度下,由于不同成分单晶高温合金枝晶间粗大g’相和g+g’共晶含量不同,不含难熔元素Re和W的单晶高温合金再结晶面积最大,含Re单晶高温合金的再结晶面积大于含W单晶高温合金,同时添加Re和W的单晶高温合金再结晶面积最小.
The effects of refractory elements Re and W on the recrystallization behavior of the as-cast Ni-based single crystal superalloy with different Re and W contents were studied by Brinell hardness tester at 1230 ~ 1330 ℃ for 1 h. Results It shows that the recrystallized grains are formed on the indentation surface and extend inward along the dendrites, and the migration of the grain boundaries is hindered by the coarse g ’phase and the g + g’ eutectic between the dendrites. The addition of Re and W improves the as-cast single The g ’phase dissolution temperature and g + g’eutectic content of the crystal superalloy lead to the increase of the recrystallization temperature of the single crystal superalloy.The recrystallization area of each single crystal superalloy increases with the increase of the heat treatment temperature, ’Phase and the eutectic content increases with the same heat treatment temperature, due to the different composition of single crystal superalloy gG between the coarse and g g g g eutectic content of eutectic, non-refractory elements Re and W The recrystallization area of the single crystal superalloy is the largest. The recrystallization area of the single crystal superalloy containing Re is larger than the single crystal superalloy containing W, and the recrystallization area of the single crystal superalloy with the addition of Re and W is the smallest.