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鎳基高溫合金GH4282的凝固和偏析行為
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作者單位:

1.北京科技大學(xué);2.鋼鐵研究總院

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中圖分類號:

TG132.3；TG111.4；TG113

基金項(xiàng)目:

國家自然科學(xué)基金資助(項(xiàng)目號51601041)


Solidification and segregation behavior of nickel-based superalloy GH4282
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1.University of Science and Technology Beijing;2.Central Iron and Steel Research Institute

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    摘要:

    采用差示掃描量熱（DSC）分析、顯微組織觀察和熱力學(xué)計(jì)算相結(jié)合的方法對鎳基高溫合金GH4282的凝固過程和元素偏析行為進(jìn)行研究，得到了合金的凝固順序以及元素偏析特征。結(jié)果表明，GH4282合金的凝固順序?yàn)椋害没w、MC碳化物以及少量的硼化物。由DSC測得的合金GH4282合金的固-液相溫度范圍為1316~1367 ℃，MC、M6C型碳化物和γ′相的溶解溫度分別為1338 ℃、1092 ℃和1003 ℃。熱力學(xué)計(jì)算結(jié)果表明，GH4282合金在凝固過程C、B、Ti和Mo偏聚于枝晶間，Al偏析于枝晶干，Cr、Fe和Co幾乎不發(fā)生偏析，這與鑄態(tài)組織觀察到的元素偏析特征是一致的。

    Abstract:

    The solidification process and the segregation behavior of the elements of GH4282 superalloy were investigated by a combination of differential scanning calorimeter (DSC), microstructure observation and thermodynamic calculation. The solidification sequence and the characteristics of elements segregation were obtained. The results show that the solidification sequence of GH4282 is as follows: γ matrix, MC carbide and a small amount of boride. The solidus-liquidus temperature range determined by DSC is 1316~1367 ℃. The measured solvus temperature of MC carbide, M6C carbide and γ′ phase is 1338 ℃, 1092 ℃and 1003 ℃, respectively. Thermodynamic calculations show that C, B, Ti and Mo segregate to the interdendritic regions, while Al segregates to the dendrite cores. Cr, Fe and Co do not exhibit any significant tendency to segregate to either the interdendritic region or the dendrite core during the solidification process of GH4282 superalloy. These results about segregation behavior of the elements agree well with those observed by as-cast microstructure observation.

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顏曉峰,董建新,石照夏,段春華.鎳基高溫合金GH4282的凝固和偏析行為[J].稀有金屬材料與工程,2019,48(10):3183~3189.[Yan Xiaofeng, Dong Jianxin, Shi Zhaoxia, Duan Chunhua. Solidification and segregation behavior of nickel-based superalloy GH4282[J]. Rare Metal Materials and Engineering,2019,48(10):3183~3189.]
DOI：10.12442/j. issn.1002-185X.20180461

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  • 收稿日期:2018-05-07
  • 最后修改日期:2018-06-27
  • 錄用日期:2018-07-31
  • 在線發(fā)布日期: 2019-11-01
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