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熱處理冷速對(duì)FGH97盤件顯微組織和蠕變性能的影響
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深圳市萬澤中南研究院有限公司

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廣東省重點(diǎn)領(lǐng)域研發(fā)計(jì)劃項(xiàng)目(基金號(hào)：2019B010935001)； 深圳市海外高層次人才資金(基金號(hào)：20150128085205453)


Effect of Solution Cooling Rate on Microstructure and Creep Properties of FGH97 Nickel-base Superalloy of Large Turbine Disk
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Shenzhen Wedge Central South Research Institute Co., Ltd

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    摘要:

    對(duì)FGH97粉末高溫合金盤件進(jìn)行熱處理處理,采用光學(xué)顯微鏡,掃描電子顯微鏡,能譜儀和蠕變試驗(yàn)機(jī)研究了不同固溶冷速下合金的顯微組織、蠕變性能、蠕變變形方式和蠕變斷裂機(jī)制。研究表明：隨固溶冷速的增加,γ′相尺寸減小,碳化物由連續(xù)析出變?yōu)轭w粒狀彌散析出,晶界碳化物為富Ti、Nb、Hf的MC相。在750℃/450MPa蠕變試驗(yàn)條件下,冷速為94℃/min的樣品性能明顯優(yōu)于冷速為43℃/min的樣品。FGH97 粉末高溫合金在750℃/450MPa條件下的蠕變機(jī)制為通過切割γ′相產(chǎn)生塑性變形,在晶界處產(chǎn)生應(yīng)力集中導(dǎo)致裂紋的萌生,裂紋沿著晶界碳化物擴(kuò)展,最終導(dǎo)致材料的斷裂,彌散顆粒狀分布的碳化物能有效抑制微裂紋的貫通。

    Abstract:

    FGH97 nickel-base superalloy were processed at different solution cooling rates, then the microstructure and creep behavior of FGH97 nickel-base superalloy were studied by optical microscope, scanning electron microscope, energy disperse spectroscopy and creep testing machine. The results show that the grain size decreases, the size of γ′ precipitates decreases and the carbide precipitates change from continuous to discrete with the increasing solution cooling rate, and GB carbides are composed of (Ti, Nb, Hf)-rich. The creep performance of the alloy with a solution cooling rate of 94 ℃/min was significantly better than that with a cooling rate of 43 ℃/min under 750℃/450MPa.γ′ cutting is the deformation mechanism of FGH97 alloy under 750℃/450MPa, stress concentration at grain boundary leads to initial cracks, then crack propagates along grain boundary and finally leads to fracture. The disperse distribution carbides on grain boundary can inhibit the propagation of microcracks.

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張海,鄒志歡,龍安平,王沖,歐業(yè)韜.熱處理冷速對(duì)FGH97盤件顯微組織和蠕變性能的影響[J].稀有金屬材料與工程,2020,49(7):2488~2493.[Zhanghai, Zouzhihuan, Longanping, Wangchong, Ouyetao. Effect of Solution Cooling Rate on Microstructure and Creep Properties of FGH97 Nickel-base Superalloy of Large Turbine Disk[J]. Rare Metal Materials and Engineering,2020,49(7):2488~2493.]
DOI：10.12442/j. issn.1002-185X.20190547

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  • 收稿日期:2019-06-28
  • 最后修改日期:2019-08-28
  • 錄用日期:2019-09-06
  • 在線發(fā)布日期: 2020-08-31
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