钎焊热循环对DD6单晶合金微观组织的影响
Effect of brazing thermal cycles on microstructure of single crystal alloy DD6
查看参考文献26篇
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文摘
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在1220 ℃/30 min条件下对DD6单晶高温合金进行连续三次钎焊热循环实验,分析和研究经钎焊热循环的合金枝晶元素成分偏析情况,以及合金的组织演变规律和性能变化。结果表明:DD6单晶高温合金在每次钎焊热循环后,元素在枝晶干区域和枝晶间区域的偏析程度与原始态相比无明显变化。经过一次钎焊热循环后合金中 γ'相虽然明显长大,但仍然保持了相对较好的立方度;经过两次和三次热循环,γ'相的立方化程度降低较为明显,表明在此条件下钎焊修复次数不应超过一次。随着钎焊热循环次数的增加,原始的γ'相除了变大和连接成片之外,少部分γ'相边缘由平直状态向参差不齐的状态转变,并逐渐大量锯齿化;枝晶干区域和枝晶间区域的基体通道内均形成细小的二次γ'相。经不同次数钎焊热循环的DD6合金在980 ℃/250 MPa下加载100 h,之后每间隔10 h增加25 MPa应力至断裂,持久寿命与原始态合金基本相当,但断后伸长率和断面收缩率逐渐增大。 |
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其他语种文摘
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In this paper, repeated brazing thermal cycles were carried out for the single crystal superalloy DD6 at 1220 ℃ for 30 min. The dendrite segregation was analyzed. The microstructural evolution and mechanical property of the alloy DD6 after thermal cycles were studied in detail. The results showed that the segregation coefficient didn't change obviously after brazing thermal cycles in comparison with the original state. After one brazing thermal cycle, the γ' phases grew up visibly, but they still kept a certain degree of cubitization. After two or three brazing thermal cycles, the cubitization of the γ ' phases decreased obviously. Therefore, the brazing repair times should not be more than one in this condition. With the increase of brazing thermal cycles, the original γ ' phases not only became larger and connected, but also a small part of the γ ' phase edge changed from straight state to uneven state, and gradually a large number of serrated state. It was also found that the fine secondary γ' phases were formed in some of γ matrix during each cycle either in the dendritic core or interdendritic region. After each thermal cycle, the alloy DD6 can keep 100 h at 980 ℃ with the initial stress of 250 MPa. After that, the stress was increased by 25 MPa every 10 h until the sample fractured. The stress rupture life was similar to that without thermal cycle, but the elongation and redution of area were increased gradually. |
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来源
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航空材料学报
,2021,41(6):51-58 【核心库】
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DOI
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10.11868/j.issn.1005-5053.2021.000067
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关键词
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钎焊热循环
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DD6单晶合金
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微观组织
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γ'相
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地址
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1.
中国航发北京航空材料研究院, 北京, 100095
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北京市航空发动机先进焊接工程技术研究中心, 北京市航空发动机先进焊接工程技术研究中心, 北京, 100095
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空军装备部驻北京地区第六军事代表室, 北京, 100095
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1005-5053 |
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学科
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金属学与金属工艺;航空、航天技术的研究与探索 |
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基金
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民用飞机专项科研项目
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国家自然科学基金项目
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文献收藏号
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CSCD:7111402
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