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新型鈮基高溫合金熱處理組織性能研究
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中國科學(xué)院金屬研究所,貴州黎陽航空動(dòng)力有限公司,中國科學(xué)院金屬研究所,中國科學(xué)院金屬研究所,中國科學(xué)院金屬研究所,中國科學(xué)院金屬研究所

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TG146.4

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;國家自然科學(xué)基金項(xiàng)目（面上項(xiàng)目，重點(diǎn)項(xiàng)目，重大項(xiàng)目）


Research of heat treatment on the microstructure and mechanical properties of a Nb-base superalloy
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Institute of Metal Research, Chinese Academy of Sciences,Guizhou Liyang Action Power Co.,Ltd,Institute of Metal Research, Chinese Academy of Sciences,Institute of Metal Research, Chinese Academy of Sciences,Institute of Metal Research, Chinese Academy of Sciences,中國科學(xué)院金屬研究所

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    摘要:

    摘 要：研究了熱處理對(duì)一種HRS定向凝固技術(shù)制備Nb/Nb5Si3原位復(fù)合材料組織和性能的影響。采用掃描電子顯微鏡（SEM）、X射線衍射（XRD）和電子探針（EPMA）等分析手段對(duì)熱處理過程中組織演變進(jìn)行了分析：鑄態(tài)合金主要由Nbss、γ-(Nb,Ti)5Si3、β-(Nb,Ti)5Si3以及初生碳化物組成；熱處理后，鑄態(tài)組織中部分β-(Nb,Ti)5Si3向α-(Nb,Ti)5Si3轉(zhuǎn)變以及二次碳化物析出，同時(shí)硅化物相逐漸溶解或破碎成小塊并發(fā)生球化；1150℃時(shí)效可促進(jìn)(Nb,Ti)5Si3向(Ti,Nb)5Si3轉(zhuǎn)變。熱處理后，合金壓縮以及室溫拉伸強(qiáng)度提高，而1000℃拉伸強(qiáng)度變化不明顯；溫度對(duì)斷裂方式有明顯影響，低溫下為脆性解理斷裂，高溫下為韌性斷裂。

    Abstract:

    The effect of heat treatment on the microstructure and mechanical properties of an Nbss/Nb5Si3 in situ composites prepared by HRS method was investigated. The microstructure evolution of samples during heat treatment process were analysed by SEM、XRD and EPMA: the result showesd that the as-cast alloy consisted of Nbss、γ-Nb5Si3 、β-Nb5Si3 and primary carbide phase; after heat treatment, the β-(Nb,Ti)5Si3 phase was transformed to α-(Nb,Ti)5Si3 phase and the secondary carbide was precipitated. Meanwhile, the silicide phase gradually dissolved or broken into small pieces, with the morphology changing from the needle into granules. The transformation (Nb,Ti)5Si3 →(Ti,Nb)5Si3 occurred when aging at 1150℃.The compressive strength and room temperature tensile strength of heat-treatment specimens were improved, while the tensile strength of as-cast and heat-treated samples at 1000℃ was at same level. The temperature has a great influence on the fracture mode, cleavage fracture at low temperature and ductile fracture at high temperature.

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石磊,姚剛,于金江,崔傳勇,孫曉峰,金濤.新型鈮基高溫合金熱處理組織性能研究[J].稀有金屬材料與工程,2017,46(8):2260~2265.[shilei, yaogang, yujinjiang, cuichuanyong, sunxiaofeng, Jintao. Research of heat treatment on the microstructure and mechanical properties of a Nb-base superalloy[J]. Rare Metal Materials and Engineering,2017,46(8):2260~2265.]
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  • 收稿日期:2013-06-20
  • 最后修改日期:2017-02-21
  • 錄用日期:2017-03-29
  • 在線發(fā)布日期: 2017-11-16
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