Delta phase precipitation in Inconel 718
Delta phase precipitation in Inconel 718
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DOI：
10.1016/j.matchar.2004.07.004
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发表时间：
2004-09-01
影响因子：
4.7
通讯作者：
Warren, R
中科院分区：
文献类型：
--
作者：
Azadian, S;Wei, LY;Warren, R
研究了镍合金Inconel 718的三种变形和一种喷射成形（SF）型δ相的析出和溶解动力学。在700至1000度的等温时效过程中，喷射成形版本和一个变形版本的沉淀长达100小时。三角洲相以不均匀分布的薄片状形式析出，并提出了一种测量这种析出形态体积分数的替代方法。在800℃及以上温度下，定量测定了沉淀的体积分数和血小板厚度分布。最大降水率发生在大约900摄氏度。铌含量为5.06 ~ 5.41 wt.%时，溶液温度在1005 ~ 1015℃之间。采用等时处理对四种合金中δ相的溶解进行了研究，证实了上述溶剂温度范围。研究了δ相及其溶出对合金晶粒长大的影响。(C) 2004爱思唯尔公司版权所有。
The precipitation and dissolution kinetics of the delta-phase were studied in three wrought versions and one spray-formed (SF) version of the nickel alloy, Inconel 718. The precipitation in the spray-formed version and one wrought version was followed during isothermal ageing for up to 100 h between 700 and 1000 degreesC. The delta-phase precipitates in the form of nonuniformly distributed thin platelets and an alternative method of measuring volume fraction of this precipitate morphology is proposed. At and above 800 degreesC, the precipitation was measured quantitatively in terms of the volume fraction and platelet thickness distribution. The maximum rate of precipitation occurred at approximately 900 degreesC. The solvus temperature lay between 1005 and 1015 degreesC for Nb contents of 5.06 and 5.41 wt.%, respectively. A study was made of the dissolution of the delta-phase in all four alloys using isochronal treatments and this confirmed the above solvus temperature range. The effect of delta-phase and its dissolution on the grain growth of the alloys was also determined. (C) 2004 Elsevier Inc. All rights reserved.