Influence of solution heat treatment on microstructure and tensile properties of Inconel 718 formed by high-deposition-rate laser metal deposition
Influence of solution heat treatment on microstructure and tensile properties of Inconel 718 formed by high-deposition-rate laser metal deposition
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DOI：
10.1016/j.jallcom.2017.11.004
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发表时间：
2018-04-05
影响因子：
6.2
通讯作者：
Schleifenbaum, Johannes Henrich
中科院分区：
文献类型：
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作者：
Sui, Shang;Zhong, Chongliang;Schleifenbaum, Johannes Henrich
研究了固溶热处理对高沉积速率激光熔积Inconel 718合金组织和拉伸性能的影响。采用两种不同的热处理方案：1100 ℃ × 0.5h/WQ+720 ℃ × 8h/FC至620 ℃ × 8h/AC（这种类型的样品称为S型）和1100 ℃ × 1h/WQ+720 ℃ × 8h/FC至620 ℃ × 8h/AC（这种类型的样品称为L型）。结果表明，S型和L型试样均消除了铌的偏析和Laves相。这意味着如果需要初始外延柱状晶粒并且铌偏析和Laves相倾向于被去除，则在1100 ℃下热处理不超过0.5 h就足够了。孪晶仅存在于L型样品中，这是L型样品伸长率上级S型样品的主要原因。这两种试样的断裂机制均为微孔聚并韧性断裂。颗粒状亚微米颗粒与γ基体的分离是微孔洞的主要核。(C)2017爱思唯尔B. V.保留所有权利。
The influence of solution heat treatment on microstructure and tensile property of Inconel 718 formed by high-deposition-rate laser metal deposition has been investigated in this paper. Two different heat treatment regimes were employed: 1100 degrees C x 0.5 h/WQ+720 degrees C x 8 h/FC to 620 degrees C x 8 h/AC (this type of samples is called type-S) and 1100 degrees C x 1 h/WQ+720 degrees C x 8 h/FC to 620 degrees C x 8 h/AC (this type of samples is called type-L). The results showed that niobium segregation and Laves phases were eliminated both in type-S and type-L samples. This means that heat treatment at 1100 degrees C for no more than 0.5 h is enough, if initial epitaxial columnar grains are needed and niobium segregation and Laves phases are tend to be removed. Twins only existed in type-L sample, which was the main reason why the elongation of type-L was superior to that of type-S. The fracture mechanism of these two samples was microvoids coalescence ductile rupture. The separation of the granular sub-micron particles and the gamma matrix was the main nucleus of the micro-voids. (C) 2017 Elsevier B.V. All rights reserved.