Precipitation Behavior of Nitride Inclusions in K418 Alloy under the Continuous Unidirectional Solidification Process

Fan YANG; Wencheng ZHAO; Yuan HOU; Xiliang GUO; Qiang LI; Xia LI; Jianbo YU; Yunbo ZHONG; Kang DENG; Zhongming REN

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Precipitation Behavior of Nitride Inclusions in K418 Alloy under the Continuous Unidirectional Solidification Process

机译：在连续单向凝固过程下K418合金中氮化物夹杂物的沉淀行为

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Adopting effective routs to control the precipitation and size of nitride inclusions in superailoys during the solidification is a very interesting subject for metallurgists. The precipitation behavior of nitride inclusions in K418 alloy under the continuous unidirectional solidification process was investigated by scanning electron microscopy, ASPEX Explorer, and LECO ONH-836. The results show that there were two types of nitride inclusions in the K418 alloy ingot: TiN and complex inclusion of Al_2O_3-TiN. There were gradient distributions of the number density, average and max sizes of nitride inclusions along the casting direction, as well as the contents of Ti and N. Based on the thermodynamic and kinetic calculations, the precipitation time of TiN inclusion changed from mushy to liquid zones under different initial contents of Ti and N. Al_2O_3 inclusion began to precipitate in liquid zone and acted as the nucleation site for TiN inclusion. The radius of TiN inclusion increased from 3.2 μm at 0.36 K/s to 8.6 μm at 0.08 K/s when the fraction of solid approached 1. The nitride inclusions can be refined and reduced in the K418 alloy ingot under the continuous unidirectional solidification process compared with those in revert K418 alloy. The methods to control the precipitation and size of nitride inclusions were reducing the contents of N and O and increasing the cooling rates.

机译：在凝固过程中采用有效的溃败来控制超人杆的氮化物夹杂物中的氮化物夹杂物的沉淀和大小是冶金师的非常有趣的主题。通过扫描电子显微镜，ASPEX探险仪和LECO ONH-836研究了在连续的单向凝固过程下K418合金中氮化物夹杂物的析出行为。结果表明，K418合金铸锭中有两种类型的氮化物夹杂物：锡和复合物包含Al_2O_3-TIN。沿着铸造方向的数量密度，平均和最大尺寸的数量密度，平均和最大尺寸的梯度分布，以及Ti和N的含量。基于热力学和动力学计算，锡夹杂物的降水时间从糊状到液体变化在Ti和N的不同初始含量下的区域开始沉淀在液体区中并用作含锡夹杂物的成核位点。当固体接近的固体级分1分钟时，锡含量的半径从0.36k / s的3.2μm增加到8.6μm。在连续的单向凝固过程中，氮化物夹杂物可以在K418合金锭中得到精制和减少与恢复K418合金的人。控制氮化物夹杂物的沉淀和尺寸的方法降低了N和O的含量并增加了冷却速率。

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来源
《ISIJ international》 |2021年第1期|229-238|共10页
作者
Fan YANG; Wencheng ZHAO; Yuan HOU; Xiliang GUO; Qiang LI; Xia LI; Jianbo YU; Yunbo ZHONG; Kang DENG; Zhongming REN;
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State Key Laboratory of Advanced Special Steel & School of Materials Science and Engineering Shanghai University Shanghai 200072 China;

State Key Laboratory of Advanced Special Steel & School of Materials Science and Engineering Shanghai University Shanghai 200072 China;

State Key Laboratory of Advanced Special Steel & School of Materials Science and Engineering Shanghai University Shanghai 200072 China;

State Key Laboratory of Advanced Special Steel & School of Materials Science and Engineering Shanghai University Shanghai 200072 China;

State Key Laboratory of Advanced Special Steel & School of Materials Science and Engineering Shanghai University Shanghai 200072 China;

State Key Laboratory of Advanced Special Steel & School of Materials Science and Engineering Shanghai University Shanghai 200072 China;

State Key Laboratory of Advanced Special Steel & School of Materials Science and Engineering Shanghai University Shanghai 200072 China;

State Key Laboratory of Advanced Special Steel & School of Materials Science and Engineering Shanghai University Shanghai 200072 China;

State Key Laboratory of Advanced Special Steel & School of Materials Science and Engineering Shanghai University Shanghai 200072 China;

State Key Laboratory of Advanced Special Steel & School of Materials Science and Engineering Shanghai University Shanghai 200072 China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种 eng
中图分类
关键词
continuous unidirectional solidification process; K418 alloy; nitride inclusions; precipitation behavior;

机译：连续单向凝固过程;K418合金;氮化物夹杂物;降水行为;

Precipitation Behavior of Nitride Inclusions in K418 Alloy under the Continuous Unidirectional Solidification Process

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