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采用新型Gleeble-1500热力学模拟试验机,研究了微量Ca和Mg同时添加对铸态镍基高温合金热塑性的影响。在合金中,加入微量Ca和Mg元素主要有三方面的作用:1.部分残余Ca和Mg偏聚于晶界,改善晶界成分;2.与O、S、P等夹杂相结合,消除这些杂质在晶界偏聚的有害作用;3.分散并球化一次碳化物,特别是消除晶界处的那些长片状一次碳化物,本试验结果表明,在合金中添加适量的Ca+Mg,提高了合金的零塑性温度,显著改善了合金的热塑性,使合金的可热加工温度范围扩大约40℃,因而有利于合金锭锻造成型。
A new type of Gleeble-1500 thermodynamic simulator was used to study the influence of the addition of trace Ca and Mg on the thermoplastic properties of as-cast Ni-base superalloy. In the alloy, the addition of trace amounts of Ca and Mg elements mainly has three aspects: 1. Partial residual Ca and Mg segregate at the grain boundaries to improve grain boundary composition; 2. Combined with O, S, P and other inclusions to eliminate these impurities In the grain boundary segregation of the harmful effects; 3 dispersed and spheroidization of primary carbides, especially those at the grain boundary to eliminate those long flake carbides, the test results show that adding an appropriate amount of Ca + Mg alloy, increased The zero-plasticity temperature of the alloy significantly improves the thermoplasticity of the alloy, expanding the hot-working temperature range of the alloy by about 40 ° C, thereby facilitating forging forming of the alloy ingot.