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MGH956合金是采用独特的机械合金化工艺,将在超高温下可保持稳定的纳米级Y2O3颗粒均匀分散于基体中,以充分实现弥散强化的一种铁基高温合金。相比其他同类合金,MGH956合金具有高熔点、低比重、低线膨胀系数,突出的抗高温氧化和腐蚀、优异的高温持久强度,良好的热疲劳等性能。针对粗晶组织存在韧脆转变的现象,着重开展了细晶板材的研究。就MGH956合金粗晶组织、细晶组织以及与其他同类合金的性能进行了对比,并展望了合金的应用前景。
MGH956 alloy is a kind of iron-based superalloy which is dispersed and strengthened by the unique mechanical alloying process, which can uniformly disperse nano-scale Y2O3 particles which can be kept stable under ultra-high temperature in the matrix. Compared with other similar alloys, MGH956 alloy has the characteristics of high melting point, low specific gravity, low linear expansion coefficient, outstanding high temperature oxidation and corrosion resistance, excellent high temperature endurance and good thermal fatigue. Aiming at the phenomenon of ductile-brittle transition of coarse grain structure, the research on fine-grained sheet metal is emphatically carried out. The coarse grain microstructure, fine grain microstructure and the properties of MGH956 alloy are compared with those of other similar alloys, and the application prospects of the alloy are prospected.