文章信息/Info

Title:

Research Progress on Microstructure Refinement of TiAl alloys by Rapid Cooling

文章編號:

1674-3962(2020)09-0627-07

作者:

陳林; 梁永鋒; 林均品

（北京科技大學(xué) 新金屬材料國家重點(diǎn)實(shí)驗(yàn)室，北京 100083）

Author(s):

CHEN Lin; LIANG Yongfeng; LIN Junpin

(State Key Laboratory for Advanced Metals and Materials，University of Science and Technology Beijing， Beijing 100083，China)

關(guān)鍵詞:

TiAl合金; 快速冷卻; 相變; 細(xì)化組織

Keywords:

TiAl alloys;  rapid cooling;  phase transformation;  refinement

分類號:

TG146��23

DOI:

10.7502/j.issn.1674-3962.201912022

文獻(xiàn)標(biāo)志碼:

A

摘要:

TiAl合金具有低密度、高比強(qiáng)度、優(yōu)異的抗氧化性能以及抗蠕變性能，但較低的室溫塑性限制了其應(yīng)用。細(xì)小的片層組織有助于改善TiAl合金的力學(xué)性能�？焖倮鋮s法細(xì)化TiAl合金組織具有工藝簡單且操作方便等特點(diǎn)而備受關(guān)注。主要介紹了從3個(gè)相區(qū)：液相區(qū)、β相區(qū)和α相區(qū)進(jìn)行快速冷卻，并結(jié)合后續(xù)熱處理實(shí)現(xiàn)組織細(xì)化，分析了不同溫度區(qū)間和冷速對淬火組織的影響。主要從相變過程、細(xì)化原理、組織控制以及組織對性能的影響等方面展開，闡述了快速冷卻法細(xì)化TiAl合金的研究進(jìn)展，并對其存在的問題以及發(fā)展前景進(jìn)行了討論。

Abstract:

TiAl alloys have attractive properties such as low density, high modulus, excellent oxidation resistance and creep resistance at elevated temperatures, but the low room�瞭emperature ductility limits their application. The fine lamellar microstructure contributes to the mechanical properties improvement of TiAl alloys. The method of refining the microstructure of TiAl alloys through rapid cooling has attracted much attention due to the simple process and easy operation. Rapid cooling from 3 regions, i�眅. liquid phase, β phase and α phase with subsequent heat treatment for microstructure refinement, and the effects of different temperature and cooling rate on quenched microstructure are reviewed. From aspects of phase transformation, refinement mechanism, microstructure control and the effect of microstructure refinement on mechanical properties, the research status of the TiAl alloys�� microstructure refinement by rapid cooling are discussed. The disadvantages and the prospect of this refining method are also discussed.