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GH864合金熱加工過程中組織特征研究
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國家自然科學(xué)基金(50771011)


A Study on Microstructural Characteristics during Hot Processing of GH864 Superalloy
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    摘要:

    為了觀察分析煙氣輪機動葉片GH864合金在熱加工過程中組織演化規(guī)律，并進一步進行組織的優(yōu)化控制，對取自棒材和成品葉片的熱加工態(tài)及隨后經(jīng)熱處理的樣品進行系統(tǒng)的顯微組織對比分析。結(jié)果表明：原始棒料晶粒度較均勻，葉片局部位置存在項鏈狀組織；葉片晶粒度的不均勻性主要是由于鍛造的過程中各部位的應(yīng)變量不同，因而產(chǎn)生不同的動態(tài)再結(jié)晶行為；經(jīng)過標(biāo)準(zhǔn)熱處理后葉片發(fā)生了靜態(tài)再結(jié)晶和晶粒長大現(xiàn)象，晶粒度較為均勻。在葉片的鍛造過程中，M23C6和部分次生MC發(fā)生了回溶，在合金中僅有一些少量的TiC存在，它們主要分布于基體的晶界處

    Abstract:

    The microstructural evolution of GH864 superalloy during the hot working process of gas turbine blades was systematically studied by observation of grain size, SEM micrographs and X-ray analysis of samples extracted from rolled bars and forged blades with or without standard heat treatment. The results show that the original rolled bar had uniform equiaxed grains, while necklace structure was found in some locations of blades. This kind of non-uniform grain size was caused mainly by different dynamic recrystallization behavior due to unequal strain in different locations of the blade during forging. Static recrystallization and grain growth happened during heat treatment, which led to more uniform and bigger grain structure. M23C6 and partial secondary MC dissolved after forging. Only a small amount of TiC existed in alloy, which mostly distributed in the grain boundaries, and heat treatment resulted in sufficient precipitation of block-shaped M23C6 discontinuously precipitated along the grain boundaries

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洪成淼,董建新,張玉峰,張麥倉,鄭 磊. GH864合金熱加工過程中組織特征研究[J].稀有金屬材料與工程,2009,38(3):510~513.[Hong Chengmiao, Dong Jianxin, Zhang Yufeng, Zhang Maicang, Zheng Lei. A Study on Microstructural Characteristics during Hot Processing of GH864 Superalloy[J]. Rare Metal Materials and Engineering,2009,38(3):510~513.]
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  • 收稿日期:2008-03-01
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