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不同使用溫度下DD6單晶高溫合金的組織演變行為
發(fā)布人：上海艾荔艾金屬材料有限公司www.jshcn.cn
更新時(shí)間：2015-12-04
對完全熱處理后的第二代單晶高溫合金DD6分別在1100、1150、1200、1250、1300和1320 ℃溫度下保溫1 h后再進(jìn)行空冷處理。用掃描電鏡(SEM)分析經(jīng)不同溫度處理后合金的顯微組織，通過JMatPro相圖計(jì)算和差熱分析討論合金的組織演變機(jī)理。
不同使用溫度下DD6單晶高溫合金的組織演變行為Microstructure evolution behavior ofDD6 single crystal superalloy at different using temperatures
?對完全熱處理后的第二代單晶高溫合金DD6分別在1100、1150、1200、1250、1300和1320 ℃溫度下保溫1 h后再進(jìn)行空冷處理。用掃描電鏡(SEM)分析經(jīng)不同溫度處理后合金的顯微組織，通過JMatPro相圖計(jì)算和差熱分析討論合金的組織演變機(jī)理。結(jié)果表明：DD6合金在1100、1150和1200 ℃保溫處理后，γ′相尺寸稍有增大；1250 ℃保溫處理后，γ′相尺寸明顯增大，大小分布極不均勻，大部分γ′/γ相界面為鋸齒狀；1300 ℃保溫處理后，少部分未完全回溶的γ′相具有鋸齒狀的γ′/γ相界面，大部分γ′相回溶后重新析出不規(guī)則、細(xì)小的γ′相；1320 ℃保溫處理后，γ′相完全回溶后重新析出不規(guī)則、細(xì)小的γ′相。合金經(jīng)不同溫度處理后，γ′相長大或溶解、或重新析出的相大小、形態(tài)和體積分?jǐn)?shù)均不相同。在1100 ℃熱處理后，合金中γ′相體積分?jǐn)?shù)比完全熱處理合金稍有增加；在其他溫度下處理后，合金中γ′相體積分?jǐn)?shù)比完全熱處理合金的均不同程度地減小。合金完全熱處理后和經(jīng)過1320 ℃保溫處理后，基體通道中沒有二次γ′相析出；而在1100~1300 ℃熱處理后，基體通道中析出細(xì)小的二次γ′相。合金在不同溫度處理后得到明顯不同特征的組織，表明使用溫度對合金的組織有顯著的影響。
The second generation single crystal superalloy DD6 after standard heat treatment was heat-treated at 1100, 1150, 1200, 1250, 1300 and 1320 ℃ for 1 h, respectively, and was then air cooled. The microstructures of the alloy heat-treated at different temperatures were investigated by SEM. The microstructure evolution mechanism of the alloy was estimat using JMatPro software and DSC．The results show that the size of γ′ phase slightly increases after DD6 super alloy heat-treatment at 1100, 1150 and 1200 ℃. The size of γ′ phase increases apparently and its size distribution is very uneven after heat treatment at 1250 ℃. The small part of γ′ phase has serrated γ′/γ phase surface as a result of incomplete solution and the irregular small γ′ phase is major after heat-treatment at 1300 ℃. While the irregular small γ′ phase precipitates again, followed complete solution after heat-treatment at 1320 ℃. The size, shape and volume fraction of γ′ phase vary with the heat treatment temperatures because it grows, dissolves or precipitates again. The volume fraction of γ′ phase decreases to different degrees after heat-treatment at different temperatures except 1100 ℃. There is no fine second γ′ phase in the γ matrix channel of the alloy after standard heat-treatment and heat-treatment at 1320 ℃. But the fine second γ′ phase precipitates in the γ matrix channel after heat-treatment at temperature range of 1100-1300 ℃. Different microstructures are obtained after heat-treatment at different temperatures, which indicates that the using temperature has obvious effect on the microstructure of the alloy.
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