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K417G高温合金中Mn的存在形式和分布及Mn含量对高温持久性能的影响
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1.中国科学院金属研究所 师昌绪先进材料创新中心,辽宁 沈阳 110016;2.东北大学,辽宁 沈阳 110819

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Existence Form and Distribution of Mn and the Effect of Mn Content on High-Temperature Stress Rupture Proper-ties of K417G Superalloy
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1.Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;2.Northeastern University, Shenyang 110819, China

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    摘要:

    研究了Mn含量在0.09%~0.35%(质量分数)范围内变化对K417G高温合金的高温持久性能的影响,并且探究了Mn的存在形式和分布情况。结果表明,Mn固溶于γ基体中,并偏聚于γ+γ'共晶帽前沿的γ'贫化区的基体中。Mn元素促进了Al和Ti元素向枝晶间区域的偏析,从而增加了枝晶间区域γ+γ'共晶的体积分数,减小了枝晶干中γ'相的尺寸。随着Mn含量的增加,在950 ℃/235 MPa的条件下,合金的持久寿命和塑性均大大降低。Mn含量最小的合金具有最佳的高温持久性能。

    Abstract:

    The high-temperature stress rupture properties of K417G superalloy with various Mn contents (0.09wt%~0.35wt%) were studied and the existence form and distribution of Mn were evaluated as well. The results show that Mn is solid-dissolved in γ matrix and enriched in γ'-depleted matrix in front of γ+γ' eutectic cap. Mn elements promote the segregation of Al and Ti to interdendrite zone, thus increasing the volume fraction of γ+γ' eutectic in interdendrite zone and decreasing the size of γ' phase in dendrite core. With the increase of Mn content, the stress rupture life and the plasticity decrease greatly under the condition of 950 °C/235 MPa. The alloy with the minimal Mn content shows the optimal high-temperature stress rupture properties.

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杨亚倩,邢炜伟,陈伟亮,陈波,马颖澈,刘奎.K417G高温合金中Mn的存在形式和分布及Mn含量对高温持久性能的影响[J].稀有金属材料与工程,2021,50(10):3470~3476.[Yang Yaqian, Xing Weiwei, Chen Weiliang, Chen Bo, Ma Yingche, Liu Kui. Existence Form and Distribution of Mn and the Effect of Mn Content on High-Temperature Stress Rupture Proper-ties of K417G Superalloy[J]. Rare Metal Materials and Engineering,2021,50(10):3470~3476.]
DOI:10.12442/j. issn.1002-185X.20200623

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  • 收稿日期:2020-08-20
  • 最后修改日期:2020-09-01
  • 录用日期:2020-09-21
  • 在线发布日期: 2021-10-28
  • 出版日期: 2021-10-25