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Ni-Cr-W基高溫合金二次M23C6析出行為
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新世紀(jì)優(yōu)秀人才計劃（NCET-07-0690）和高等學(xué)校學(xué)科創(chuàng)新引智計劃（B08040）


Secondary M23C6 Precipitation Behavior in Ni-Cr-W Based Superalloy
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    摘要:

    采用差示掃描量熱法（DSC）、掃描電鏡（SEM）和透射電鏡（TEM）系統(tǒng)研究了Ni-Cr-W基高溫合金二次M23C6的析出行為。結(jié)果表明，合金中二次M23C6的析出溫度范圍為648~1147 ℃，當(dāng)溫度高于1160 ℃時M23C6發(fā)生固溶；初生M6C在1349 ℃發(fā)生分解；合金在1400 ℃時完全熔化。由于時效溫度不同，合金中析出兩種不同形貌的M23C6。在較低溫度時（655~900 ℃）粗大片層狀M23C6在晶界析出；在900 ℃以上M23C6的形貌由片層狀轉(zhuǎn)變?yōu)椴贿B續(xù)顆粒狀。降溫速率對M23C6的析出形貌產(chǎn)生一定影響；同時，降溫過程中晶界上不連續(xù)顆粒狀M23C6的析出是導(dǎo)致彎曲晶界形成的主要原因。

    Abstract:

    The precipitation behavior of the secondary M23C6 carbide in Ni-Cr-W based superalloy was studied by DSC, SEM and TEM systematically. The results show that secondary M23C6 carbide precipitates from 648 to 1147 °C and it dissolves into the matrix when the temperature is above 1160 °C. The primary M6C carbide decomposes at 1349 °C and the alloy melts completely at 1400 °C. There are two morphologies of M23C6 precipitate at the grain boundaries. Coarse lamella M23C6 precipitates from 655 to 900 °C and it changes to discrete particles above 900 °C. The cooling rate has an important effect on M23C6 precipitation behavior. In addition, during the cooling process, the serrated grain boundaries are formed because of the discrete M23C6 carbide particles which precipitate at grain boundaries.

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柏廣海,胡 銳,李金山,鐘 宏,寇宏超,傅恒志. Ni-Cr-W基高溫合金二次M23C6析出行為[J].稀有金屬材料與工程,2011,40(10):1737~1741.[Bai Guanghai, Hu Rui, Li Jinshan, Zhong Hong, Kou Hongchao, Fu Hengzhi. Secondary M23C6 Precipitation Behavior in Ni-Cr-W Based Superalloy[J]. Rare Metal Materials and Engineering,2011,40(10):1737~1741.]
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  • 收稿日期:2010-10-21
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