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新型可脫離式隔熱板對(duì)燃?xì)廨啓C(jī)葉片定向凝固過程的影響
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西北工業(yè)大學(xué) 凝固技術(shù)國家重點(diǎn)實(shí)驗(yàn)室,西北工業(yè)大學(xué) 凝固技術(shù)國家重點(diǎn)實(shí)驗(yàn)室,東方汽輪機(jī)有限公司,西北工業(yè)大學(xué) 凝固技術(shù)國家重點(diǎn)實(shí)驗(yàn)室,西北工業(yè)大學(xué) 凝固技術(shù)國家重點(diǎn)實(shí)驗(yàn)室

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“973”計(jì)劃 (2013CB035703)


Using new baffle to control defects in a vacuum investment-cast Ni-based turbine blade
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State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an,State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an,Dongfang Turbine Co Ltd,State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an,State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an

Fund Project:

National Basic Research Program of China

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    摘要:

    基于有限元模擬軟件，對(duì)實(shí)際工藝參數(shù)條件下的大型空心燃?xì)廨啓C(jī)葉片凝固全過程中的溫度場、溫度梯度、凝固界面的演變進(jìn)行了模擬仿真，以此為基礎(chǔ)研究了雀斑缺陷形成機(jī)理及其規(guī)律。模擬結(jié)果與實(shí)驗(yàn)結(jié)果取得了良好的吻合。模擬結(jié)果表明，在葉片榫頭處溫度梯度突然降低是導(dǎo)致此處局部缺陷產(chǎn)生的主要原因。并針對(duì)該實(shí)驗(yàn)現(xiàn)象設(shè)計(jì)了一種新型隔熱板，大幅度提高了葉片凝固界面前沿的溫度梯度，從而達(dá)到控制葉片榫頭處雀斑缺陷的目的。

    Abstract:

    Based on finite element simulation, temperature field, temperature gradient and the evolution of solidification interface of the large hollow turbine blade in the process of directional solidification had been simulated.The experimental results demonstrated that defects were observed at the expanding cross section of casting in directionally solidified nickel-based superalloys. Numerical results indicated that the phenomenon should be attributed to the lower thermal gradient in this zone. Based on these results, one type of the new baffle was proposed.Calculated results reveal that the reasonable design of the new baffle could improve the thermal gradient in the local area. Therefore, the new baffle could more effectively affect the freckle formation and enhanced the mechanical performances of casting.

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引用本文

秦嶺,沈軍,楊功顯,李秋東,傅恒志.新型可脫離式隔熱板對(duì)燃?xì)廨啓C(jī)葉片定向凝固過程的影響[J].稀有金屬材料與工程,2016,45(5):1284~1289.[Qin Ling, Shen Jun, Yang Gongxian, Li Qiudong, Fu Hengzhi. Using new baffle to control defects in a vacuum investment-cast Ni-based turbine blade[J]. Rare Metal Materials and Engineering,2016,45(5):1284~1289.]
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  • 收稿日期:2015-01-18
  • 最后修改日期:2015-11-25
  • 錄用日期:2015-12-08
  • 在線發(fā)布日期: 2016-06-02
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