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高合金化难变形高温合金GH4975热裂敏感性研究
作者:
作者单位:

1.北京科技大学 材料科学与工程学院;2.中国航发北京航空材料研究院先进高温材料重点实验室

基金项目:

北京市自然科学基金(项目号2242042)


Study on hot cracking sensitivity of Wrought superalloy GH4975 with high alloying
Author:
Affiliation:

1.School of Materials Science and Engineering,University of Science and Technology Beijing;2.Key Laboratory of Science Technology on Advanced High Temperature Structural Materials,AECC Beijing Institute of Aeronautical Materials

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    摘要:

    为研究高合金化难变形高温合金GH4975热裂敏感性,对GH4975合金铸锭裂纹形貌和组织特征进行观察,结合其凝固行为和热力学计算等方式分析热裂原因。结果表明,裂纹沿晶界和枝晶间扩展,等轴晶区比柱状晶区具有更大的热裂倾向。铸锭中心区域易出现缩孔,连续缩孔的形成导致枝晶间搭接不充分,易在应力作用下被拉开从而形成裂纹源。同时枝晶间Al、Ti、Nb元素偏析严重,复杂的析出相尤其是大量的(γ+γ′)共晶相促进了裂纹的形核与扩展。JMatPro计算可知GH4975合金固液两相区收缩率大,不可补缩温度范围大,易形成缩孔从而成为裂纹源,同时不可补缩温度区间内合金线性膨胀系数变化大,裂纹易扩展。

    Abstract:

    In order to study the hot cracking sensitivity of high alloying refractory superalloy GH4975, the crack morphology and microstructure characteristics of the ingot of GH4975 were observed, and the causes of hot cracking were analyzed by means of solidification behavior and thermodynamic calculation. The results show that the crack spreads along grain boundaries and dendrites, and the equiaxed crystal region has a greater tendency to crack than the columnar crystal region. Shrinkage holes are easy to appear in the center of the ingot. The formation of continuous shrinkage holes leads to insufficient overlap between dendrites, which is easy to be pulled apart under the action of stress to form a crack source. At the same time, the segregation of Al, Ti and Nb elements between dendrites is serious, and complex precipitates, especially a large number of (γ+γ ') eutectic phases, promote the nucleation and propagation of cracks. JMatPro's calculation shows that GH4975 alloy has a large shrinkage rate in the solid-liquid two-phase zone and a wide range of non-complementary temperature, which is easy to form a shrinkage hole and become a crack source. Meanwhile, the linear expansion coefficient of the alloy changes greatly in the non-complementary temperature range, and the crack is easy to expand.

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朱 兴,江 河,董建新,万志鹏.高合金化难变形高温合金GH4975热裂敏感性研究[J].稀有金属材料与工程,,().[ZHU Xing, JIANG He, DONG Jianxin, WAN Zhipeng. Study on hot cracking sensitivity of Wrought superalloy GH4975 with high alloying[J]. Rare Metal Materials and Engineering,,().]
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  • 收稿日期:2024-09-16
  • 最后修改日期:2024-11-18
  • 录用日期:2024-12-02