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晶界碳化物對GH864合金裂紋擴(kuò)展速率的影響
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國家自然科學(xué)基金 (50771011)


Effect of the Grain Boundary Carbide on the Crack Propagation Rates of GH864 Alloy
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    研究不同熱處理制度后晶界碳化物對GH864合金650 ℃裂紋擴(kuò)展速率的影響。結(jié)果表明：不同熱處理制度處理后GH864合金晶界碳化物形態(tài)逐漸演化：顆粒較少→斷續(xù)狀→連續(xù)狀→項(xiàng)鏈狀→包膜狀。晶界碳化物不斷析出起到強(qiáng)化晶界的作用，使裂紋擴(kuò)展速率降低。得到GH864合金晶界碳化物連續(xù)系數(shù)fc與裂紋擴(kuò)展速率的變化趨勢圖。當(dāng)晶界碳化物連續(xù)系數(shù)fc小于1時，抗裂紋擴(kuò)展能力隨晶界碳化物尺寸的增加而增加。建立裂紋擴(kuò)展速率與晶粒尺寸和晶界碳化物的綜合作用的關(guān)聯(lián)性，晶粒尺寸和晶界碳化物之間相互作用存在最低點(diǎn)，抗裂紋擴(kuò)展能力最佳

    Abstract:

    The effects of grain boundary carbide on crack propagation behavior of GH864 alloy were studied at 650 oC after different heat-treatment. The results indicate that the pattern of grain boundary carbide of GH864 alloy is gradually evolved after different heat-treatment, i.e. little particle→discontinued→continued→necklace→closed. The precipitation of grain boundary carbide strengthens the grain boundary and decreases the crack growth rate. The change tendency was concluded between the grain boundary carbide continuous factor and the crack growth rate. When the grain boundary carbide continuous factor is below 1, the crack propagation resistance increases with increasing the size of grain boundary carbide and grain size. The comprehensive interaction effect between the grain size and grain boundary carbide was also concluded. The optimum crack propagation resistance may exist when there is the lowest point in the interaction effect between the grain size and grain boundary carbide

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王 璞,董建新,李振亮,任慧平,金自力,張 婧,陳 偉,翟 景.晶界碳化物對GH864合金裂紋擴(kuò)展速率的影響[J].稀有金屬材料與工程,2014,43(11):2723~2727.[Wang Pu, Dong Jianxin, Li Zhenliang, Ren Huiping, Jin Zili, Zhang Jing, Chen Wei, Zhai Jing. Effect of the Grain Boundary Carbide on the Crack Propagation Rates of GH864 Alloy[J]. Rare Metal Materials and Engineering,2014,43(11):2723~2727.]
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  • 收稿日期:2013-11-16
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  • 在線發(fā)布日期: 2015-04-07
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