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23卷    第z1期    总第1期    2013年12月

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文章编号:1004-0609(2013)S1-0433-04
热处理工艺对TB8钛合金显微组织和力学性能的影响
商国强,王新南,费 跃,李 军,朱知寿

(北京航空材料研究院,北京 100095)

摘 要: 研究不同热处理制度对TB8钛合金的显微组织特征和力学性能的影响。结果表明:当固溶温度高于β相变点并随后进行时效处理后,形成了明显的晶界,获得了长大的再结晶β晶粒组织。随着时效温度的升高,TB8合金的拉伸强度逐渐降低,而伸长率和断面收缩率均略有升高,其变化不是很明显。当固溶温度低于β相变点并随后进行时效处理后,再结晶后的β晶粒较小,晶界不连续且晶内组织非常细小,拉伸强度和拉伸塑性均获得明显提高,获得了更优的强塑性匹配效果。TB8钛合金经不同固溶时效处理后,均具有较高的剪切强度。

 

关键词: TB8合金;热处理;显微组织;力学性能

Effects of heat treatment processing on microstructure and mechanical properties of TB8 alloy
SHANG Guo-qiang, WANG Xin-nan, FEI Yue, LI Jun, ZHU Zhi-shou

Beijing Institute of Aeronautical Materials, Beijing 100095, China

Abstract:Effects of different heat treatments on microstructure and mechanical properties of TB8 alloy were analyzed. The results show that, when the solution temperature is above the β transus followed by aging treatment, the obvious grain boundary forms, and the grown recrystal β grains are obtained. With the aging temperature increasing, the tensile strength of TB8 alloy decreases gradually, while the tensile plasticity does not change obviously. When the solution temperature is below the β transus followed by aging treatment, the recrystal β grains are smaller, the grain boundary is discontinuation and the intragranular microstructures are very finer. At the same time, the tensile strength and tensile plasticity obtains increase obviously, the best combination of strength and ductility are obtained. After different heat treatments, all TB8 alloys have higher shear strength.

 

Key words: TB8 alloy; heat treatment; microstructures; mechanical properties

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

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

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