通过液态X射线衍射研究了铸态镍基高温合金M963的液态结构和熔体处理.结果表明：1520℃过热的M963合金熔体中除存在短程有序外, 还有Ni3Al型中程有序原子团簇和残余MC碳化物颗粒；M963合金的熔体结构与其热历史密切相关；与不经任何熔体处理工艺相比, M963合金经1550-1650℃常规熔体精炼后, 975℃/225 MPa条件下的持久寿命和持久塑性明显提高；传统MgO坩埚不能用于1850℃熔体高温处理；采用新研制的具有高抗热震性能的坩埚进行1850℃熔体高温处理M963合金返回料,可显著改善其975℃/225 MPa条件下的持久性能.
The liquid structure and melt treatment of M963 Ni base superalloy have been studied by using high temperature X-ray diffraction. The results show that there exist Ni3Al-like cluster and residual MC carbide in the alloy melt superheated at 1520℃, and the liquid structure of the M963 superalloy has a close relationship to the thermal history of the alloy melt. Both the rupture life and elongation of M963 superalloy at 975℃ under 225 MPa are all prolonged obviously by melt treatment at 1550-1650℃. The commercial MgO crucible is unsuitable for high temperature treatment of melt at 1850℃, but by using a new developed crucible such treatment can carry out and can obviously increase the rupture property of the recycled M963 superalloy at 975℃ and 225 MPa.
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