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鑄造鈦合金α層的組織與形成機(jī)理
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大連理工大學(xué)

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TG 146. 2 3

基金項(xiàng)目:

國(guó)家自然科學(xué)基金項(xiàng)目（面上項(xiàng)目，重點(diǎn)項(xiàng)目，重大項(xiàng)目）


Micrstructure and Formation Mechanism of Alpha-case in Cast Titanium Alloy
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Dalian University of Technology

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    摘要:

    利用熔模鑄造的方法制備了Ti-6Al-4V合金鑄造試樣，通過(guò)金相、電子探針、顯微硬度測(cè)試等技術(shù)研究了鑄造鈦合金表面α層的組織和形成機(jī)理。結(jié)果表明，鑄造鈦合金試樣表面均形成了α層，顯微組織特征為呈“網(wǎng)籃”狀排列的粗大片狀α相組織。α層形成機(jī)理主要與型殼材料中間隙氧原子和碳原子向合金基體擴(kuò)散有關(guān)。顯微硬度測(cè)試得到的α層深度略大于金相結(jié)果。為完整去除α層，以硬度測(cè)試的結(jié)果更為可靠。

    Abstract:

    The ingot of Ti-6Al-4V alloy was prepared by investment casting. Microstructure and formation mechanism of alpha-case in the surface layer of the ingot were investigated by optical microscope (OM), electron probe micro-analyzer (EPMA) and Vickers hardness. The results show that the alpha-case covers the whole surface of the sample, and the microstructure of the alpha-case features in a coarse plate-shaped structure which ranked as-basketweave. The formation mechanism of alpha-case is associated with the diffusion of interstitial oxygen and carbon atoms in the shell material toward matrix alloy. Depth of alpha-case obtained from micro-hardness testing is slightly deeper than that observed by OM. More reliable results come from the micro-hardness testing for removing the alpha-case completely.

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房燦峰.鑄造鈦合金α層的組織與形成機(jī)理[J].稀有金屬材料與工程,2016,45(7):1736~1739.[Fang Canfeng. Micrstructure and Formation Mechanism of Alpha-case in Cast Titanium Alloy[J]. Rare Metal Materials and Engineering,2016,45(7):1736~1739.]
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  • 收稿日期:2014-06-25
  • 最后修改日期:2014-07-23
  • 錄用日期:2014-08-12
  • 在線(xiàn)發(fā)布日期: 2016-10-09
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