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一種含硼第三代鎳基單晶高溫合金的初熔及固溶處理研究
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西北工業(yè)大學(xué)凝固技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室,西北工業(yè)大學(xué)凝固技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室

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國(guó)家自然科學(xué)基金（51171151）;國(guó)家重點(diǎn)研發(fā)計(jì)劃（2016YFB0701405）; 國(guó)家自然科學(xué)基金（51331005）


Investigation on incipient melting and solution heat treatement of a boron-bearing third generation single crystal nickel base superalloy
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Chinese National Natural Science Foundation（51171151） ；The national key research and development program（2016YFB0701405）;Chinese National Natural Science Foundation（51331005）

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    摘要:

    采用電子探針測(cè)試結(jié)合Thermo-Calc軟件計(jì)算，研究了一種含0.001 wt%硼第三代單晶高溫合金枝晶間區(qū)域的初熔過程。結(jié)果表明，初熔相為M2B，初熔溫度為1265 ℃，遠(yuǎn)低于用差示掃描量熱儀測(cè)得的共晶熔化溫度1352 ℃。采用掃描電鏡分析固溶處理過程中合金組織的演化過程，發(fā)現(xiàn)共晶組織中馬賽克狀共晶和扇狀共晶率先溶解，粗大γ′最后溶解。初熔區(qū)域空冷可發(fā)生均質(zhì)形核，重新凝固后的共晶組織呈圓形，初熔組織中粗大γ′組織較初始凝固的粗大γ′組織更細(xì)，而相比殘余共晶組織，初熔組織中含有馬賽克狀共晶和扇狀共晶。在通用分步固溶處理制度的基礎(chǔ)上，通過低于硼化物初熔的首步處理和適當(dāng)提高最終固溶溫度（ST2），可以有效避免初熔并完全消除共晶。

    Abstract:

    The incipient melting process of a B bearing third generation single crystal superalloy was investigated by Thermol-Calc software. The simulation data was obtained by EPMA. The results show that the incipient melting phase was M2B and the incipient melting temperature was 1265 ℃, which is significantly lower than the melting temperature of eutectic (1352 ℃) obtained by DSC. The dissolution of γ/γ′ eutectics was studied by SEM. It was indicated that more time and higher temperature were necessary to dissolve the coarsen γ′ in eutectics than mosaic like eutectics and fan like eutectics. The sharp of incipient melting region was round. Homogenous nucleation could be found in incipient melting region due to the fast cooling rate of air cooling. The resolidification structure owned mosaic like eutectics and fan like eutectics which were dissolved in the early stage of solution heat treatment.

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張琰斌,劉林.一種含硼第三代鎳基單晶高溫合金的初熔及固溶處理研究[J].稀有金屬材料與工程,2017,46(10):3105~3110.[zhang yan bin, liu lin. Investigation on incipient melting and solution heat treatement of a boron-bearing third generation single crystal nickel base superalloy[J]. Rare Metal Materials and Engineering,2017,46(10):3105~3110.]
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  • 收稿日期:2016-06-29
  • 最后修改日期:2016-11-24
  • 錄用日期:2016-12-06
  • 在線發(fā)布日期: 2017-12-01
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