Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第20卷    第z1期    总第1期    2010年10月

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文章编号:1004-0609(2010)S1-s0229-04
热处理对铸造Ti-23Al-17Nb合金组织和拉伸性能的影响
韩积亭,程云君,梁晓波,张建伟,李世琼

(钢铁研究总院,北京100081)

摘 要: 在1 000 ℃和1 020 ℃对铸造合金保温3 h后空冷,研究不同热处理温度对铸造Ti-23Al-17Nb(摩尔分数,%)合金组织和拉伸性能的影响。结果表明:铸造合金为等轴晶,晶界和晶粒内均析出呈网篮状魏氏组织的α2板条;经热处理后,晶粒内细小的α2板条充分析出,晶界处连续的α2相断开;随着处理温度的提高,析出的α2板条数量随之减少,板条宽度随之增加;热处理能提高合金的抗拉强度和伸长率,经1 020 ℃,3 h,AC热处理后试样的伸长率达到4%,其拉伸断口主要是由沿晶断裂和准解理断裂组成。

 

关键字: Ti-23Al-17Nb合金;热处理;组织;拉伸性能

Effect of heat treatment on microstructure and tensile properties
of cast Ti-23Al-17Nb alloy
HAN Ji-ting, CHENG Yun-jun, LIANG Xiao-bo, ZHANG Jian-wei, LI Shi-qiong

Central Iron & Steel Research Institute, Beijing 100081, China

Abstract:The cast alloy was insulated at 1 000 and 1 020 ℃ for 3 h and then air-cooled. The effect of heat treatment temperature on the microstructure and tensile properties of cast Ti-23Al-17Nb (mole fraction, %) alloy were investigated. The results show that the macrostructure of the cast alloy is equiaxed grain. The lath α2 phase precipitated in the alloy exhibits a fine basket weave Widmanstatten microstructure. After heat treatment, the α2 phase precipitates more than the cast alloy, and the α2 phase in boundary is disconnected. With the increase of temperature, the quantity of the α2 phase decreases, but its width increases. Heat treatment can improve the tensile strength and elongation of the alloy. After heat treatment at 1 020 ℃ for 3 h, AC, the elongation of sample reaches 4%. The tensile fracture consists of intergranular fracture and cleavage fracture.

 

Key words: Ti-23Al-17Nb alloy; heat treatment; microstructure; tensile property

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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