热处理对TiAl/Ti_2AlNb放电等离子扩散焊接头微观组织与力学性能的影响
Effect of heat treatment on microstructure and mechanical properties of TiAl/Ti_2AlNb joint by spark plasma diffusion bonding
查看参考文献17篇
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文摘
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采用放电等离子扩散连接方法,实现了TiAl/Ti_2AlNb合金扩散连接,对焊后的接头进行不同温度的热处理,分析热处理后接头显微组织,并检测接头抗拉强度和显微硬度。结果表明:热处理后Ti_2AlNb母材、TiAl母材和界面处显微形貌无明显变化;Ti_2AlNb热影响区发生B2相向O相转变,由于针状O相的析出,热影响区的显微硬度较焊态显著增加。随着热处理温度的升高,Ti_2AlNb热影响区的显微硬度逐渐减小,接头的室温抗拉强度逐渐增加。当热处理温度为900℃时,接头抗拉强度最大为376MPa。热处理后接头的断裂方式为脆性断裂。 |
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其他语种文摘
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TiAl/Ti_2AlNb dissimilar alloys were successfully bonded together by spark plasma diffusion bonding.The joints were subjected to post-weld heat treatment at different temperatures.The microstructure of the welded joint was analyzed and the tensile strength and microhardness of the joint were tested.The results indicate that after heat treatment,the microstructure of Ti_2AlNb base metal, TiAl base metal and interface has no obvious change.In the Ti_2AlNb heat affected zone(HAZ),most B2phase gradually turns into O phase,due to the precipitation of acicular O phase,the microhardness increases significantly compared to as welded condition. With the increase of heat treatment temperature,the microhardness of the Ti_2AlNb HAZ gradually decreases,meanwhile,the tensile strength of the joint at room temperature shows an evident increase compared to as welded.The maximum tensile strength of the joint reaches 376MPa at heat treatment temperature of 900℃.After heat treatment,the fracture mode of the joint is brittle fracture. |
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来源
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材料工程
,2021,49(9):87-93 【核心库】
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DOI
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10.11868/j.issn.1001-4381.2019.000866
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关键词
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放电等离子扩散焊
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TiAl
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Ti_2AlNb
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抗拉强度
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显微硬度
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地址
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1.
中国航空制造技术研究院, 航空焊接与连接技术航空科技重点实验室, 北京, 100024
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大连交通大学材料科学与工程学院, 辽宁, 大连, 116028
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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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1001-4381 |
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学科
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金属学与金属工艺 |
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基金
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国家自然科学基金
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文献收藏号
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CSCD:7073079
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