23C6相在晶界析出量逐漸減少,1040℃以上晶粒急劇長大。"/>

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鎳基耐蝕合金925均勻化及固溶過程組織演變規(guī)律
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北京科技大學(xué),北京科技大學(xué),北京科技大學(xué),北京科技大學(xué)

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國家“863”計(jì)劃資助(項(xiàng)目號 2013AA031005 )


Microstructure Evolution of 925 Alloy during Homogenisation and Solution Treatment
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University of Science and Technology Beijing,University of Science and Technology Beijing,University of Science and Technology Beijing,University of Science and Technology Beijing

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    摘要:

    為研究925合金在均勻化及固溶過程中組織演變規(guī)律,利用金相顯微鏡、掃描電鏡和能譜分析等對經(jīng)真空感應(yīng)熔煉(VIM)和保護(hù)氣氛下電渣重熔(ESR)雙聯(lián)工藝冶煉的925合金的原始鑄態(tài)、均勻化態(tài)、鍛態(tài)和固溶態(tài)的組織和析出相進(jìn)行分析。結(jié)果表明：鑄態(tài)組織中含有TiN、MC、γ′相、σ相以及η相；1160℃退火5h可使γ′相、σ相及η相回溶,退火20h偏析基本消除；在950-1070℃固溶過程中,M23C6相在晶界析出量逐漸減少,1040℃以上晶粒急劇長大。

    Abstract:

    In order to investigate the microstructure evolution of 925 alloy during homogenization and solution treatment, nickel-based superalloy 925 alloy ingots of vacuum-induction-melting and electroslag-remelting were prepared and homogenization and solution tests were carried out. The microstructure and precipitations of 925 samples were studied by optical microscopy,scanning electron microscopy,and energy dispersive spectroscopy．It is found that there exist phases such as TiN, MC, σ phase, γ′ phase and η phase in the ingots， and σ phase, γ′ phase and η phase can be remelted in 1160℃ after 5h. After homogenization at 1160℃ for 20 h,this segregation can almost be eliminated. In solution treatment range of 950℃ to 1070℃, the amount of grain boundary precipitation of M23C6 decreases gradually and the grain size increases quickly.

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李景陽,董建新,姚志浩,張麥倉.鎳基耐蝕合金925均勻化及固溶過程組織演變規(guī)律[J].稀有金屬材料與工程,2018,47(7):2080~2086.[Li Jingyang, Dong Jianxin, Yao Zhihao, Zhang Maicang. Microstructure Evolution of 925 Alloy during Homogenisation and Solution Treatment[J]. Rare Metal Materials and Engineering,2018,47(7):2080~2086.]
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  • 收稿日期:2016-07-07
  • 最后修改日期:2016-08-31
  • 錄用日期:2016-09-14
  • 在線發(fā)布日期: 2018-10-10
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