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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第15卷    第8期    总第77期    2005年8月

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文章编号:1004-0609(2005)08-1167-06
热变形温度对TC18钛合金显微组织和力学性能的影响
沙爱学, 李兴无, 王庆如, 鲍如强

(北京航空材料研究院, 北京 100095)

摘 要:  研究了热变形温度从(tβ-25 ℃)~(tβ+20 ℃)变化时, 对TC18钛合金模锻件显微组织和拉伸、 冲击、 断裂韧度等主要力学性能的影响。 结果表明: 合金强度随变形温度升高变化不大,均在1 200 MPa左右; 而塑性、 冲击韧性以及断裂韧度等性能指标对热变形温度变化反应敏感; 两相区变形时获得双态组织,合金的塑性和冲击韧性较高,Ψ≥40%,aKU≥40 J/cm2; 但断裂韧度偏低, KIC<50 MPa·m1/2β区变形时获得片状组织,合金具有较高的断裂韧度,KIC>50 MPa·m1/2; 但塑性和冲击韧性较低, Ψ≥20%,aKU≥25 J/cm2。 在相变点附近变形时容易导致合金组织和性能出现不均匀性。

 

关键词:  TC18钛合金; 热变形温度; 显微组织; 力学性能

Influence of hot deformation temperature on microstructure and mechanical properties of TC18 alloy
SHA Ai-xue, LI Xing-wu, WANG Qing-ru, PAO Ru-qiang

Beijing Institute of Aeronautical Materials, Beijng 100095, China

Abstract: The influence of die forging temperature (changing from tβ-25 ℃ to tβ+20 ℃) on microstructure and mechanical properties such as tensile, impact and fracture toughness are studied when the other parameters kept consistent. The results show that ultimate strength of TC18(Ti-5Al-5Mo-5V-1Cr-1Fe) alloy remains at about 1 200 MPa when the die forging temperature increases. The ductility, impact property and fracture toughness are sensitive with the variety of die forging temperature. When deforming in α-β field, bimodel structure can be obtained. Ductility and impact toughness of the alloy are relatively high, but the fracture toughness is relatively low. Under this condition, the value of reduction of area and aKU are over 40% and 40 J/cm2, respectively; KIC is lower than 50 MPa·m1/2. When deforming in β field, lamellar structure can be obtained. The fracture toughness is relatively high, but ductility and impact toughness are lower than α-β field deforming. Under this condition, KIC is over 50 MPa·m1/2, the value of reduction of area and aKU are over 20% and 25 J/cm2, respectively. When deforming near beta transition point, it may lead to the uncertainty of microstructure and properties of TC18 alloy.

 

Key words: TC18 alloy; hot deformation temperature; microstructure; mechanical properties

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

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

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