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Pt絲型芯撐對DD5單晶高溫合金組織和性能的影響
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1.太原理工大學(xué) 材料科學(xué)與工程學(xué)院，北京鋼研高納科技股份有限公司;2.北京鋼研高納科技股份有限公司;3.重慶賽寶工業(yè)技術(shù)研究院有限公司，中國電子產(chǎn)品可靠性與環(huán)境試驗研究所;4.太原理工大學(xué) 材料科學(xué)與工程學(xué)院

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中國鋼研科技集團(tuán)有限公司核心技術(shù)產(chǎn)品攻關(guān)工程項目(重20GN0001GG)


Effect of core support made of Pt on the microstructure and property of DD5 single crystal superalloy
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Gaona Aero Material Co., Ltd.

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    摘要:

    為保證內(nèi)腔尺寸精度,復(fù)雜空心單晶渦輪葉片通常采用Pt絲型芯撐固定陶瓷型芯,然而Pt絲型芯撐對單晶渦輪葉片基體組織和性能的影響規(guī)律研究未見報道。本文以DD5二代單晶高溫合金為研究對象,通過在單晶薄板中插入Pt絲型芯撐模擬研究型芯撐對于渦輪葉片基體組織和成分偏析的影響,同時測試插入Pt絲型芯撐后DD5合金薄板的典型性能,明確型芯撐對于合金性能的影響規(guī)律。結(jié)果表明：Pt絲型芯撐與DD5合金基體熔接效果好,無明顯異質(zhì)界面,Pt絲完全合金化,其組織與DD5合金基體組織一致,未形成新相。Pt絲型芯撐的插入對于DD5合金基體組織的影響不大,但導(dǎo)致合金元素偏析程度升高。此外,Pt絲型芯撐的插入對DD5合金薄板的室溫拉伸、870℃拉伸及1093℃/158MPa持久性能未產(chǎn)生明顯負(fù)面影響,合金的斷裂模式為枝晶間開裂,裂紋沿碎裂的碳化物及碳化物與基體界面處萌生并擴(kuò)展。

    Abstract:

    In order to ensure the accuracy of internal dimension, core supports made of Pt are normally used in the complex hollow single crystal turbine blades. However, the influence of core supports on the microstructure and property of DD5 single crystal turbine blades has not been reported. In this paper, core supports made of Pt were inserted into DD5 thin-wall plate specimens to observe the effect of core support on the microstructure and element segregation. In addition, the typical properties of DD5 thin-wall plate specimens with core support made of Pt were tested to clarify the influence of core support on alloy properties. The results showed that core support made of Pt had great bonding with DD5 alloy without obvious heterogeneous interface. The core support made of Pt was completely alloyed, the microstructure of core support was consistent with DD5 alloy, no new phase was observed. Core support made of Pt had no influence on the microstructure of DD5 alloy, but the degree of element segregation of DD5 alloy was increased. Moreover, core support made of Pt had no negative effect on the tensile property at room temperature, tensile property at 870℃ as well as stress rupture property at 1093℃/158MPa of DD5 thin-wall plate specimens. The fracture mode of DD5 thin-wall plate specimens with core support was interdendritic rupture, and cracks initiated and propagated along the interface between carbide and matrix.

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南曉斌,袁曉飛,吳劍濤,郭小童,曹曉卿. Pt絲型芯撐對DD5單晶高溫合金組織和性能的影響[J].稀有金屬材料與工程,2023,52(3):1007~1014.[Nan Xiaobin, Yuan Xiaofei, Wu JIantao, Guo Xiaotong, Cao Xiaoqing. Effect of core support made of Pt on the microstructure and property of DD5 single crystal superalloy[J]. Rare Metal Materials and Engineering,2023,52(3):1007~1014.]
DOI：10.12442/j. issn.1002-185X.20220106

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  • 收稿日期:2022-02-10
  • 最后修改日期:2022-03-31
  • 錄用日期:2022-04-26
  • 在線發(fā)布日期: 2023-04-07
  • 出版日期: 2023-03-24