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Ni-Cr-W系高溫合金晶界特征分布的研究
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國家自然科學(xué)基金(51171150);凝固技術(shù)國家重點(diǎn)實(shí)驗(yàn)室研究課題(62-TP-2011)


Grain Boundary Character Distribution in Ni-Cr-W Superalloy
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    摘要:

    通過掃描電子顯微鏡(SEM)、電子背散射衍射(EBSD)、取向成像顯微技術(shù)(OIM)研究了在不同冷軋及退火工藝下Ni-Cr-W系高溫合金晶界特征分布的規(guī)律。結(jié)果表明,70%變形量下再結(jié)晶完成所需時(shí)間較短,特殊晶界比例隨著退火時(shí)間延長先增加后減少;10%變形量下再結(jié)晶驅(qū)動(dòng)力較小,再結(jié)晶所需時(shí)間較長,特殊晶界比例在長時(shí)間退火后達(dá)到最大值。在晶粒團(tuán)簇內(nèi)部,晶粒之間有Σ3n的取向關(guān)系,而不同的晶粒團(tuán)簇間,晶粒則沒有這種特殊的取向關(guān)系。

    Abstract:

    Grain boundary character distribution in cold-rolled Ni-Cr-W superalloys annealed for different time was investigated. Scanning electron microscope (SEM), electron backscatter diffraction (EBSD) and orientation imaging microscopy (OIM) analyses were carried out. The results show that under the cold reduction of 70%, the samples’ recrystallization time is relatively short, and the ratio of special grain boundary increases firstly and then decreases with prolonging the annealing time; under the cold reduction of 10%, the recrystallization driving force is small, the recrystallization time is long, and the ratio of special grain boundary reaches the maximum after long-time annealing. In addition, boundaries have Σ3n misorientations inside the grains-cluster, while misorientations are random for those outside.

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鄭 媛,胡 銳,李金山,柏廣海,姚草根,趙 豐,傅恒志. Ni-Cr-W系高溫合金晶界特征分布的研究[J].稀有金屬材料與工程,2013,42(4):766~770.[Zheng Yuan, Hu Rui, Li Jinshan, Bai Guanghai, Yao Caogen, Zhao Feng, Fu Hengzhi. Grain Boundary Character Distribution in Ni-Cr-W Superalloy[J]. Rare Metal Materials and Engineering,2013,42(4):766~770.]
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  • 收稿日期:2012-04-28
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