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淬火-回火工藝對(duì)Ti-46Al-xB合金柱狀晶組織的影響
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黑龍江省自然科學(xué)基金項(xiàng)目(201131); 黑龍江省教育廳科學(xué)技術(shù)研究項(xiàng)目(12521445); 黑龍江工程學(xué)院博士科研基金項(xiàng)目(2011BJ12)


Effect of Quenching-Tempering Technology on Columnar Structure in Ti-46Al-xB Alloys
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    摘要:

    研究了淬火-回火工藝對(duì)Ti-46Al-xB合金柱狀晶組織的影響。研究發(fā)現(xiàn)，淬火-回火工藝對(duì)Ti-46Al-xB合金的柱狀晶組織具有明顯的細(xì)化效果。這主要是由于溫度梯度的增加和冷卻過(guò)程中發(fā)生固態(tài)相變使晶界或相界面上原子錯(cuò)配，從而形成大量的位錯(cuò)，位錯(cuò)對(duì)晶界具有“釘扎”作用，從而細(xì)化TiAl基合金柱狀晶組織。結(jié)果表明，通過(guò)合金化元素B和熱處理工藝的共同作用可以獲得更為細(xì)小的TiAl基合金柱狀晶組織。這主要是由于隨著B(niǎo)含量的增加，硼化物的析出量增加，而硼化物對(duì)位錯(cuò)線的進(jìn)一步擴(kuò)展起到了阻礙作用。從而促進(jìn)了位錯(cuò)對(duì)晶界的“釘扎”作用，進(jìn)一步細(xì)化了TiAl基合金柱狀晶組織

    Abstract:

    The effect of the quenching-tempering process on the columnar structure in Ti-46Al-xB alloys was investigated. It is found that the columnar structures of Ti-46Al-xB alloys are evidently refined by the quenching-tempering process. The reason is that the increase of the temperature gradient and the solid state phase transformation during cooling process lead to atomic mismatch in grain boundary or phase interface, and then a large number of dislocations are formed, which can pin the grain boundary. The experimental results show that finer columnar structure of TiAl-based alloys can be obtained by addition of alloying element B and the heat treatment process. Besides, the addition of B element can impede the extension of dislocations, promoting the effect of anchoring of dislocation, and then the columnar structures are further refined in TiAl-based alloys

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楊慧敏,駱良順,宋美慧,齊海群,王春艷,楊 闖,蘇彥慶.淬火-回火工藝對(duì)Ti-46Al-xB合金柱狀晶組織的影響[J].稀有金屬材料與工程,2014,43(11):2774~2777.[Yang Huimin, Luo Liangshun, Song Meihui, Qi Haiqun, Wang Chunyan, Yang Chuang, Su Yanqing. Effect of Quenching-Tempering Technology on Columnar Structure in Ti-46Al-xB Alloys[J]. Rare Metal Materials and Engineering,2014,43(11):2774~2777.]
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  • 收稿日期:2013-11-20
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  • 在線發(fā)布日期: 2015-04-07
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