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Effect of Al and W Contents on the Solidification and Solution Microstructure of Novel γ/γ′ Cobalt‐Base Superalloys
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2019-10-17 , DOI: 10.1002/adem.201900641 Xiaozhou Zhou 1, 2 , Huadong Fu 1, 2 , Yi Zhang 1, 2 , Huan Xu 1, 2 , Jianxin Xie 1, 2
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2019-10-17 , DOI: 10.1002/adem.201900641 Xiaozhou Zhou 1, 2 , Huadong Fu 1, 2 , Yi Zhang 1, 2 , Huan Xu 1, 2 , Jianxin Xie 1, 2
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The solidification and heat treatment characteristics of superalloys are key to engineering and practical applications. The solidification and solid solution behavior of γ/γ′ cobalt‐base superalloys Co–30Ni–xAl–(15 − x)W–5Cr–1Ta–4Ti (x = 7, 9, 11 abbreviated as 7Al8W, 9Al6W, and 11Al4W, respectively) are studied using directional solidification experiments. The results indicate that there are Laves phase, (γ + γ′)e eutectics, and (β + γ′)e eutectics in the interdendritic regions for the 7Al8W alloy. The solidification sequence of the 7Al8W alloy is L → L1 + γ → L2 + γ + Laves → L3 + γ + Laves + (β + γ′)e →L4 + γ + Laves + (β + γ′)e + (γ + γ′)e → γ + Laves + (β + γ′)e + (γ + γ′)e. As the Al content increases and the W content decreases, the Laves phase fraction in the alloy decreases and the (β + γ′)e eutectics fraction increases. The Laves phase completely disappears in the 11Al4W alloy. An unremovable μ phase forms in the 7Al8W alloy during solution treatment. The 9Al6W alloy and 11Al4W alloy can exhibit a γ single‐phase microstructure after single‐stage solution treatment (1250 °C for 1 h) and two‐stage solution treatment (1210 °C for 1 h + 1275 °C for 1 h), respectively. These experimental results are helpful for composition optimization, solidification, and solution treatment parameter determination of novel γ/γ′ cobalt‐base superalloys.
中文翻译：
Al和W含量对新型γ/γ′钴基高温合金凝固和溶液微观结构的影响
高温合金的凝固和热处理特性是工程和实际应用的关键。凝固和固溶行为γ / γ '的钴基超合金共30Ni- X AL-（15 - X）W-5CR-1TA-4TI（X = 7,9，11简称为7Al8W，9Al6W和11Al4W ，分别）使用定向凝固实验进行了研究。结果表明，有拉夫斯相（γ + γ '）é共晶体，和（β + γ '）é共晶体在用于7Al8W合金间区域。7Al8W合金的凝固顺序为L → L 1 + γ → L 2 + γ + Laves→ L 3 + γ + Laves +（β + γ '）e → L 4 + γ + Laves +（β + γ '）e +（γ + γ '）e → γ + Laves +（β + γ '）e +（γ + γ '）e。随着Al含量的增加和W含量降低时，在合金中的Laves相分数降低，（β + γ '）Ê共晶体分数增加。Laves相在11Al4W合金中完全消失。不可移动的μ溶液处理期间相形成在7Al8W合金。9Al6W合金和11Al4W合金经过单阶段固溶处理（1250°C持续1 h）和两阶段固溶处理（1210°C持续1 h + 1275°C持续1 h）后可以呈现γ单相组织，分别。这些实验结果有助于新型γ / γ的成分优化，固化和固溶处理参数的确定'钴基高温合金。
更新日期：2019-10-17
中文翻译：
Al和W含量对新型γ/γ′钴基高温合金凝固和溶液微观结构的影响
高温合金的凝固和热处理特性是工程和实际应用的关键。凝固和固溶行为γ / γ '的钴基超合金共30Ni- X AL-（15 - X）W-5CR-1TA-4TI（X = 7,9，11简称为7Al8W，9Al6W和11Al4W ，分别）使用定向凝固实验进行了研究。结果表明，有拉夫斯相（γ + γ '）é共晶体，和（β + γ '）é共晶体在用于7Al8W合金间区域。7Al8W合金的凝固顺序为L → L 1 + γ → L 2 + γ + Laves→ L 3 + γ + Laves +（β + γ '）e → L 4 + γ + Laves +（β + γ '）e +（γ + γ '）e → γ + Laves +（β + γ '）e +（γ + γ '）e。随着Al含量的增加和W含量降低时，在合金中的Laves相分数降低，（β + γ '）Ê共晶体分数增加。Laves相在11Al4W合金中完全消失。不可移动的μ溶液处理期间相形成在7Al8W合金。9Al6W合金和11Al4W合金经过单阶段固溶处理（1250°C持续1 h）和两阶段固溶处理（1210°C持续1 h + 1275°C持续1 h）后可以呈现γ单相组织，分别。这些实验结果有助于新型γ / γ的成分优化，固化和固溶处理参数的确定'钴基高温合金。
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