金属热处理 ›› 2024, Vol. 49 ›› Issue (2): 71-76.DOI: 10.13251/j.issn.0254-6051.2024.02.011

• 材料研究 • 上一篇    下一篇

La含量对GH5188合金凝固过程及铸态组织的影响

蒋世川1,2, 王小川3, 唐平梅1,2, 李靖1,2, 周扬1,2   

  1. 1.成都先进金属材料产业技术研究院股份有限公司, 四川 成都 610303;
    2.海洋装备用金属材料及其应用国家重点实验室, 辽宁 鞍山 114009;
    3.攀钢集团江油长城特殊钢有限公司, 四川 绵阳 621704
  • 收稿日期:2023-09-06 修回日期:2024-01-06 出版日期:2024-03-27 发布日期:2024-03-27
  • 作者简介:蒋世川(1984—),男,高级工程师,主要研究方向为特种冶炼工艺技术、高温合金、耐蚀合金等产品开发及应用,E-mail:jsc8410@163.com

Effect of La content on solidification process and as-cast microstructure of GH5188 alloy

Jiang Shichuan1,2, Wang Xiaochuan3, Tang Pingmei1,2, Li Jing1,2, Zhou Yang1,2   

  1. 1. Chengdu Institute of Advanced Metallic Material Technology and Industry Co., Ltd., Chengdu Sichuan 610303, China;
    2. State Key Laboratory of Metal Material for Marine Equipment and Application, Anshan Liaoning 114009, China;
    3. Pangang Group Jiangyou Changcheng Special Steel Co., Ltd., Mianyang Sichuan 621704, China
  • Received:2023-09-06 Revised:2024-01-06 Online:2024-03-27 Published:2024-03-27

摘要: 利用高温共聚焦激光扫描显微镜对不同La含量的GH5188合金在冷速为10 ℃/min条件下的凝固过程进行动态原位观察,并研究了La含量对GH5188合金凝固过程、铸态组织及析出相的影响。结果表明,当La含量为0.03%、0.07%、0.10%和0.40%时,随着La含量的增加,GH5188合金的初凝温度越高,固-液两相区区间越大;凝固过程为缓慢凝固-快速凝固-缓慢凝固过程,La含量越高,峰值凝固速度越小;La含量的增加使合金铸态组织由树枝晶转变为等轴晶,析出相尺寸增大,当La含量达到0.40%时,析出相由M6C+M23C6转变为(Ni,Co)xLa+M23C6,且形成的含La金属间化合物在凝固过程中容易开裂。

关键词: GH5188合金, 稀土La, 高温共聚焦激光扫描显微镜, 凝固, 显微组织

Abstract: The solidification process of GH5188 alloy with different La contents (0.03%, 0.07%, 0.10% and 0.40%) at the cooling rate of 10 ℃/min was dynamic in-situ observed by using confocal laser scanning microscope (CLSM), and the effects of La content on the solidification process, as-cast microstructure and precipitated phases of the GH5188 alloy were studied. The results show that with the increase of La content, the initial solidification temperature and the solid-liquid two-phase region of the GH5188 alloy become higher and larger. The solidification process is slow-rapid-slow solidification, and the higher the La content, the smaller the peak solidification rate. With the increase of La content, the as-cast microstructure of the alloy changes from dendrite to equiaxed crystal, and the size of the precipitated phases increases. When the La content reaches 0.40%, the precipitated phases change from M6C+M23C6 to (Ni,Co)xLa+M23C6, and the formed La-containing intermetallic compound is easy to crack during solidification.

Key words: GH5188 alloy, rare earth element La, confocal laser scanning microscope (CLSM), solidification, microstructure

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