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鈦合金與鉻青銅電子束自熔釬焊接頭組織與力學(xué)性能
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國家自然科學(xué)基金（51075189）；國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃項(xiàng)目(2010CB731704)資助


Microstructure and Mechanical Property of Electron Beam Self-Melting Brazing Joint of Titanium Alloy to Chromium Bronze
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    摘要:

    采用銅側(cè)偏束工藝實(shí)現(xiàn)了TA15鈦合金與QCr0.8鉻青銅的電子束自熔釬焊，采用光學(xué)顯微鏡、掃描電子顯微鏡和X射線衍射分析儀對(duì)焊縫組織進(jìn)行了分析，通過接頭抗拉強(qiáng)度對(duì)接頭力學(xué)性能進(jìn)行了評(píng)價(jià)。結(jié)果表明，電子束偏向銅合金1 mm時(shí)，鈦合金母材只有上部少量熔化，實(shí)現(xiàn)與銅合金的連接，而接頭中部和下部的連接則通過液態(tài)金屬對(duì)鈦合金母材的釬接而實(shí)現(xiàn)連接。釬縫界面由較薄的Ti-Cu化合物層組成，主要包括TiCu、Ti2Cu3、TiCu2和TiCu4。而在銅側(cè)焊縫內(nèi)，細(xì)小的Ti-Cu化合物彌散分布于銅基固溶體上，使焊縫得到強(qiáng)化。接頭強(qiáng)度達(dá)到300 MPa，拉伸時(shí)斷裂發(fā)生在銅合金上，呈韌窩狀塑性斷裂模式。

    Abstract:

    Electron beam self-melting brazing experiments of TA15/QCr0.8 dissimilar metals with a copper side beam offset were carried out. Microstructure of the weld was examined by optical microscopy and scanning electron microscopy. Mechanical properties of joints were evaluated by tensile strength tests. Results show that copper content of the weld is increased by adopting copper side beam offset. So the population of Cu-Ti compounds is decreased and solid solution of copper is increased. Consequently, mechanical property of the joint is improved. There is just a little titanium alloy on the top of the weld melted when beam offset is up to 1 mm. And the joint is formed by brazing process according to the filling of the top fluid metal into the butt-weld. Finally, the tensile strength of the joint can reach to 300 MPa. Fracture occurs in copper alloy during tensile strength tests with plastic fracture mode.

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張秉剛,王 廷,陳國慶,馮吉才.鈦合金與鉻青銅電子束自熔釬焊接頭組織與力學(xué)性能[J].稀有金屬材料與工程,2012,41(1):129~133.[Zhang Binggang, Wang Ting, Chen Guoqing, Feng Jicai. Microstructure and Mechanical Property of Electron Beam Self-Melting Brazing Joint of Titanium Alloy to Chromium Bronze[J]. Rare Metal Materials and Engineering,2012,41(1):129~133.]
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  • 收稿日期:2010-12-02
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