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熔模鑄造條件下K424合金枝晶間縮松及微觀偏析研究
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清華大學(xué)機(jī)械工程系,清華大學(xué)機(jī)械工程系,清華大學(xué)機(jī)械工程系

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TG291

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Study on Interdendritic Shrinkage Porosity and Microsegregation of Superalloy K424 Under Investment Casting Process
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Department of Mechanical Engineering,Tsinghua University,Department of Mechanical Engineering,Tsinghua University,Department of Mechanical Engineering,Tsinghua University

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    摘要:

    本文結(jié)合熔模鑄造條件下K424高溫合金出現(xiàn)的高溫持久性能下降的問題,對所存在的一些缺陷進(jìn)行了研究,對缺陷的形態(tài)、成因以及對高溫持久性能的影響進(jìn)行了闡述。借助掃描電子顯微鏡、顯微硬度計(jì)等儀器對K424合金試棒進(jìn)行了觀察和測試。觀察結(jié)果表明,試棒的枝晶間存在顯微縮松。顯微縮松附近有呈規(guī)則正八面體的MC碳化物聚集。Cr元素發(fā)生了較嚴(yán)重的偏析。顯微縮松是相鄰枝晶臂搭接,剩余液相被封閉在晶間區(qū)域收縮而成。顯微縮松在高溫持久測試時(shí)引起應(yīng)力集中,作用于薄弱的晶間組織,導(dǎo)致高溫持久性能不足。

    Abstract:

    To understand the reason of creep rupture life of superalloy K424 drops sometimes under investment casting process, the defects in the test bars were investigated on the shape, distribution with the help of scanning electron microscope (SEM) and microhardness tester. The causes of the defects and influences on creep rupture were analysed. The results show that there are micro shrinkage porosities in interdendritic regions and intact regular octahedron shaped MC carbides can be founded nearby. The microsegregation of the elements is in different degrees which the most serious element is Cr. The cause of the micro shrinkage porosities is that the adjacent dendrite arms join each other and split liquid alloy into closed parts. The micro shrinkage porosities cause stress concentration in the test bars and thus cause the lower high temperature creep rupture life.

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艾厚望,呂志剛,郭馨.熔模鑄造條件下K424合金枝晶間縮松及微觀偏析研究[J].稀有金屬材料與工程,2017,46(9):2476~2480.[Ai Houwang, Lu Zhigang, Guo Xin. Study on Interdendritic Shrinkage Porosity and Microsegregation of Superalloy K424 Under Investment Casting Process[J]. Rare Metal Materials and Engineering,2017,46(9):2476~2480.]
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  • 收稿日期:2015-05-05
  • 最后修改日期:2015-07-21
  • 錄用日期:2015-09-07
  • 在線發(fā)布日期: 2017-11-29
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