FGH96合金中γ′和碳化物相平衡计算

Equilibrium Calculations of γ′ and Carbides for P/M Superalloy FGH96

摘要:

利用热力学计算软件Thermo-Calc及相应的Ni基数据库对FGH96粉末高温合金中可能析出的平衡相进行计算，并分析元素含量在允许范围内的波动对主要析出相γ′和碳化物析出行为的影响。结果表明：FGH96合金析出的平衡相有γ′、MC、M23C6、MB2、M3B2和TCP相。Al、Ti和Nb含量的增加会显著提高γ′相的固溶温度及析出量；合金中碳化物的析出量及MC的析出温度主要受到碳含量的影响，Al和Nb含量的变化对碳化物的析出温度有着显著影响，其中Al含量的影响尤为明显。

Abstract:

The equilibrium phases in P/M superalloy FGH96 were calculated by Thermo-Calc software and the relevant Ni-base superalloy database. The effects of element content in the allowable variation on the precipitation behavior of γ′ and carbides were analyzed. The calculation results show that the equilibrium precipitation phases are γ′, MC, M23C6, MB2, M3B2 and TCP phases. The solution temperature and precipitation amount of γ′ are significantly increased with more Al, Ti and Nb. The amount of carbides and the precipitation temperature of MC are mainly influenced by the content of carbon. The precipitation temperature of carbides is significantly increased with the Al content increasing and the Nb content decreasing; in particular, Al has a more important effect.