固溶和时效温度对TC6钛合金显微组织与力学性能的影响
Effects of Solution-Treatment and Aging Temperature on Microstructure and Mechanical Properties of TC6 Titanium Alloy
查看参考文献16篇
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文摘
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研究了不同温度的固溶和时效工艺对TC6钛合金显微组织和性能的影响。结果表明:800~840 ℃固溶后,合金由初生α相和亚稳β相组成,两相随着温度升高而长大,合金强度和塑性略有上升;880 ℃固溶后,亚稳β相依然保留到室温,然而在拉伸过程中出现应力诱变斜方马氏体α″相,导致双屈服现象;920~960 ℃固溶后,初生α相减少,大量的细针状斜方马氏体α″相在亚稳β相上析出,强度上升塑性下降;当超过β相变点固溶后,主要由粗大针状六方马氏体α'相组成,强度下降同时拉伸为脆性断裂。对于固溶样品经过不同温度时效处理,主要变化过程是亚稳β相分解为次生α相及其长大,300 ℃时效后,相比固溶态强度上升但塑性下降,亚稳β相中弥散析出次生α相及少量的ω相;当时效温度升高到400 ℃,强度继续上升接近最大值但塑性最差;500 ℃时效后,强度最高然而合金元素充分扩散,塑性得到提升;550 ℃时效后,强度有所下降但塑性明显提升,此时具有较佳的强塑性匹配;600~700 ℃时效后,初生 α相聚集长大并且含量增加,次生α相在β基体上析出且逐渐长大为层片状,强度下降塑性进一步提升。 |
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其他语种文摘
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Effects of solution-treatment and aging temperature on microstructure and mechanical properties of TC6 titanium alloy were investigated.The results show that when specimens are solution-treated is at 800~840 °C,primary α and metastable β phases are form and they grow up with the increase of the temperature,which result in the slight increase of the strength and ductility.The metastable β phase is also retained after solution-treatment at 880 °C though its stability is weakened,while at this moment double yield phenomenon is observed,which is attributed to stress-induced α″ orthorhombic martensite in the metastable β phase.When specimens are solution-treated at 920~960 °C,primary α phase dissolves,and a large amount of fine acicular α″ orthorhombic martensite precipitate from the metastable β phase;the strength increases and the ductility decreases,.The alloy is almost composed of coarse α' hexagonal martensite after solution treatment above the β transus,which lead to the decrease in strength and the brittle fracture during tensile test.In terms of different aging temperatures for solution-treated specimens (880 °C/1.5 h/WQ),the main microstructural changes are the precipitation of secondary α phase from the metastable β phase and its growth.Compared with solution-treated specimens,the specimens aged at 300 °C exhibit higher strength and lower ductility,and it can be seen that some secondary α phase and ω phase have precipitated from the β matrix.As the aging temperature increases to 400 °C,the maximum strength as well as minimum ductility is obtained.The specimens aged at 500 °C maintain the maximum strength,while the ductility is improved due to the sufficient diffusion of alloying elements.When the specimens are aged at 550 °C,they possess the optimum balance of strength and ductility.The primary α phase gradually gathers to grow up and the lamellar secondary α phase apparently disperses in the β matrix after aging at 600~700 °C,which lead to the decrease in strength and the increase in ductility. |
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来源
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稀有金属材料与工程
,2020,49(3):1038-1044 【核心库】
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关键词
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TC6钛合金
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固溶和时效
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显微组织
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力学性能
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地址
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中国科学院金属研究所, 辽宁, 沈阳, 110016
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1002-185X |
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学科
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金属学与金属工艺 |
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文献收藏号
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CSCD:6688022
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