Influence of Ti content on microstructure, mechanical properties and castability of directionally solidified superalloy DZ125L
Influence of Ti content on microstructure, mechanical properties and castability of directionally solidified superalloy DZ125L
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DOI：
10.1016/j.matdes.2014.04.059
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发表时间：
2014-09
影响因子：
8.4
通讯作者：
Fei Yang;Enze Liu;Zheng Zhi;J. Tong;Likui Ning
中科院分区：
文献类型：
--
作者：
Fei Yang;Enze Liu;Zheng Zhi;J. Tong;Likui Ning
采用低偏析技术制备了不同Ti含量的定向凝固DZ125L合金。研究了定向凝固高温合金DZ125L的组织、力学性能和铸造性能。随着DZ125L合金中Ti含量的降低，γ′的尺寸、体积分数和分离温度均降低。而定向凝固柱状试样的抗拉强度和断裂寿命也明显降低。合金中Ti含量的降低导致了叶片的自由热裂。与IN792合金相比，DZ125L合金需要更低的Ti/Ta比才能获得良好的浇注性。
Directionally solidified DZ125L alloys of various Ti content were developed by low segregation technology. The microstructure, mechanical properties and castability of directionally solidified superalloy DZ125L were investigated. With decreasing Ti content in DZ125L alloy, the size, volume fraction and separation temperature of γ′ decreased. While the tensile strength and rupture life of directional solidified cylindrical samples is also obviously decreased. Lowering Ti content in alloy resulted in free hot cracking casting blades. Compared with IN792 alloy, DZ125L alloy needs much lower Ti/Ta ratio to achieve good castability.