ISSN:1003-8620

CN:42-1243/TF

主管:中信泰富特钢集团股份有限公司

主办:大冶特殊钢有限公司

特殊钢 ›› 2024, Vol. 45 ›› Issue (2): 30-38.DOI: 10.20057/j.1003-8620.2023-00217

所属专题: 高温合金开发 硫磷氧的控制

• 冶炼与凝固 • 上一篇    下一篇

S对铸造高温合金K417G凝固行为的影响

杨亚倩1,2,邢炜伟1,2,丁磊磊1,2,马颖澈1,2   

  1. 1 中国科学院金属研究所师昌绪先进材料创新中心,沈阳 110016;
    2 中国科学院核用材料与安全评价重点实验室,沈阳 110016;
  • 收稿日期:2023-10-27 出版日期:2024-03-30 发布日期:2024-04-01
  • 通讯作者: 马颖澈
  • 作者简介:杨亚倩(1991—),女,硕士,工程师; E-mail:yangyq@imr.ac.cn;

Effect of S on Solidification Behavior of Cast Superalloy K417G

Yang Yaqian1,2, Xing Weiwei1,2, Ding Leilei1,2, Ma Yingche1,2   

  1. 1 Shichang Xu Advanced Material Innovation Center, Institute of Metal Research, Chinese Academy of Sciences,Shenyang 110016,China;
    2 Key Laboratory of Nuclear Materials and Safety Evaluation,Chinese Academy of Sciences, Shenyang 110016,China;
  • Received:2023-10-27 Published:2024-03-30 Online:2024-04-01
  • Contact: Ma Yingche

摘要: 在1340~1230 ℃采用等温凝固实验,研究了w[S]分别为0. 0001%、0. 0018%和0. 0037%对K417G合金凝固特性的影响。结果表明,S降低合金的固相线温度,扩大固液两相区,当w[S]从0. 0001%增加到0. 0037%时,合金的固相线温度由 1255 ℃降低至 1245 ℃。在凝固过程中 S元素偏析于液相,并在终凝区析出 Y相,且 S促进 Al、Cr元素在固液界面处的富集。在相同等温温度下,S元素对MC碳化物和γ+γ΄共晶的析出温度与形貌无明显影响,但S含量的增加促使MC碳化物、γ+γ΄共晶和Y相数量的增加,且Y相的析出温度从1230 ℃提升至1240 ℃。

关键词: S, 等温凝固, K417G, 元素偏析, Y相

Abstract: The effects of 0.0001%,0.0018% and 0.0037% S content on the solidification characteristics of K417G alloy were studied by isothermal solidification experiment in the temperature range of 1340-1230 ℃. The results show that S can reduce the solidus temperature of the alloy and enlarge the solid-liquid two phase region. When the S content increases from 0.0001% to 0.0037%, the solidus temperature of the alloy decreases from 1255 ℃ to 1245 ℃. During the solidification process, the S element segregates in the liquid phase and precipitates out as the Y phase in the final solidification zone. And S promotes the enrichment of Al and Cr elements at the solid-liquid interface. At the same isothermal temperature, the increase of S content promotes the increase of the volume fraction of MC carbide,γ+γ΄ eutectic and Y phase, and has little effect on the morphology and precipitation temperature of MC carbide and γ+γ΄ eutectic, but the precipitation temperature of the Y phase is increased from 1230 ℃ to 1240 ℃.

Key words: S, Isothermal Solidification, K417G, Element Segregation, Y Phase

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