Haynes214合金平衡相析出规律研究

Study on Equilibrium Phase Precipitations in Haynes 214 Alloy

在HS214合金中，Cr和Al含量越高，合金的高温抗氧化性越好，但Cr含量增加势必导致不利于力学性能的a-Cr相出现。本文通过相图计算软件Thermo-Calc对HS214合金进行了分析计算及组织观察，HS214合金中的主要平衡析出相为γ^1相和M7C3，M23C6碳化物。Cr含量超过30％时，主要以a-Cr相的形态存在。Cr含量主要影响a-cr的析出量及开始析出温度。Al含量主要影响γ^1相的量，Al含量分别为3％，4．5％和6％时，γ^1相析出量的摩尔分数分别为0．12，0．39和0．64。A1含量太低时（3％），不仅γ^1相的量降低，还会影响碳化物析出温度范围的变化，Al含量太高时（6％），又会诱发a相的析出。结合Cr和Al元素含量对合金抗氧化性能的影响规律，可确定合理的Cr和Al元素含量，为开发新型刷丝合金提供理论依据。

For Haynes 214 alloy, high temperature oxidation resistance property rises as Cr and A1 content increases, but a-Cr phase against mechanical properties should precipitate if Cr content increases. HS 214 alloy was studied by thermo-Calc software and microstructure observation, main equilibrium precipitation phases are γ^1,M2 C3 and M23C6 carbide phases. Cr exists as a-Cr phase when its content is up to 30%. Cr content significantly increases a-Cr mole fraction and incipient precipitating point. The content of A1 mainly influence γ^1 phase quantity. When A1 content were 3%, 4. 5% and 6%, the amount of γ^1 phase precipitation molar fraction were 0. 12, 0. 39 and 0.64. When A1 content is low（3%）, the amount of γ^1 phase reduces, and carbide precipitation temperature range is influenced. But when A1 content is too high （6 %）, o phase precipitation is induced. So combined with the influence of Cr and A1 content on oxidation resistance, reasonable Cr and A1 content can be determined, providing theoretical basis for the development of new brush seal a[toy.