Phase formation and evolution during transient liquid phase sintering of MIM418 superalloy with master alloy addition
Phase formation and evolution during transient liquid phase sintering of MIM418 superalloy with master alloy addition
复制标题
添加中间合金的 MIM418 高温合金瞬态液相烧结过程中的相形成和演化
DOI：
10.1016/j.jallcom.2020.154583
复制
发表时间：
2020-07
影响因子：
6.2
通讯作者：
Qu Xuanhui
中科院分区：
文献类型：
--
作者：
Chen Xiaowei;Liu ye;Zhang Lin;Wang Shengxi;Qu Xuanhui
采用热力学计算和扩散偶方法相结合的方法，研究了中间合金法制备的MIM418高温合金瞬间液相烧结过程中相的形成和演化。扩散偶实验结果表明，Al从中间合金向Ni颗粒的固相扩散首先导致NiAl相在Ni/中间合金界面形成，然后转变为γʹ(Ni3Al)相。热力学计算结果表明，在远低于烧结温度的情况下，中间合金粉末中形成富铬液相。随着镍颗粒的溶解，富铬相的熔点逐渐升高，导致烧结体中液态的消失。富铬过渡相弥散和润湿了Ni颗粒，凝固后主要在晶界转变为M23C6碳化物，而中间合金粉末中的MCʹ碳化物严格限制了MC碳化物形成元素(Ti，Nb)的迁移，生成的MC碳化物被限制在原始中间合金区域。MIM418合金的抗拉强度和屈服强度分别比铸造K418合金提高53%和99%，塑性降低与碳化物分布不均匀有关。
Phase formation and evolution during transient liquid phase sintering of MIM418 superalloy fabricated via master alloy approach have been investigated through a combination of thermo-dynamic calculation and diffusion couple method. Diffusion couple experimental results reveal that solid phase diffusion of Al from master alloy to Ni particles leads the formation of NiAl phase at Ni/master alloy interface initially before the formation of liquid phase, which transforms to γʹ(Ni3Al) phase subsequently. Thermo-dynamic calculation results reveal that Cr-rich liquid phase forms in the master alloy powder much lower than sintering temperature. The melting point of the Cr-rich phase increases gradually with the dissolution of Ni particles, resulting in the vanishing of the liquid in the sinter system. The Cr-rich transient liquid phase spreads and wets Ni particles, then transforms to M23C6carbide mainly on grain boundaries after solidification, while the MCʹ carbide in master alloy powder tightly limits the migration of MC carbide forming elements (Ti, Nb), and the resultant MC carbide is confined in the original master alloy region. The tensile and yield strength of MIM418 superalloy are 53% and 99% higher than that of the cast K418 alloy, and the reduced ductility is associated with the uneven distribution of carbides.
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DOI：
10.1016/j.msea.2016.02.038
发表时间：
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影响因子：
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